Hi Erik,
my wife and I purchased two beautiful Cervelo: PX (me) and P3X (my wife).
We managed to make a spectacular bike fitting; the only flaw is that the basebar in the low position is too low and in the high position it is too high; if there was the possibility of mounting a flat basebar it would be perfect; is a similar version of basebar available on the market?
Another question: when cycling on steep slopes, the hands tend to slide forward and there is no possibility to rotate the basebar upwards for safer support of the hands; Is there any modification we can make to brake our hands and travel downhill safer?
Thanks a lot in advance for your support
Ricky
Hi Eric,
I’ve attached my last Tri bike fit. Apologies as the measurements are different to the ones you specify.
Sadly don’t have this anymore so can’t input the x and y coordinates you refer to. Had a look at my road bike but not all that helpful.
It was a 54 P2, I’m 176.5cm and longer torso and shorter legs. Bars were 3T aura pro. I have long arms. Saddle height is 77cm from BB. Looking at pics of me on this I do wonder if it was a bit small as knees and elbows were a bit close.
Interested in a new p series, p3x or p5d, whichever fits best. Mainly olympic distance and 70.3s and potentially IM eventually. Can DM you other fit images with me on it if helpful?
Many thanks.
Hi Erik,
my wife and I purchased two beautiful Cervelo: PX (me) and P3X (my wife).
We managed to make a spectacular bike fitting; the only flaw is that the basebar in the low position is too low and in the high position it is too high; if there was the possibility of mounting a flat basebar it would be perfect; is a similar version of basebar available on the market?
Another question: when cycling on steep slopes, the hands tend to slide forward and there is no possibility to rotate the basebar upwards for safer support of the hands; Is there any modification we can make to brake our hands and travel downhill safer?
Thanks a lot in advance for your support
Ricky
hey Ricky, thanks for reaching out. I’m Eric with a C, not a K! Those K people are evil 
Not sure about the basebar for the P3x/PX. I’ll have to check on that. Same for the hand grips on steep descents. I’d have to ask some of the bike shop types or athletes that have been riding the PX type bikes for a long time and have more experience than me. It looks like the hand grip is raised at a certain spot to help with grip.
What about the basebar being “too high” is too high? I’ve heard anecdotal evidence that turned up is slightly faster. Would knowing that help with your feeling about how it looks? How often are you riding on the hoods anyway?
Eric
Hi Eric,
I’ve attached my last Tri bike fit. Apologies as the measurements are different to the ones you specify.
Sadly don’t have this anymore so can’t input the x and y coordinates you refer to. Had a look at my road bike but not all that helpful.
It was a 54 P2, I’m 176.5cm and longer torso and shorter legs. Bars were 3T aura pro. I have long arms. Saddle height is 77cm from BB. Looking at pics of me on this I do wonder if it was a bit small as knees and elbows were a bit close.
Interested in a new p series, p3x or p5d, whichever fits best. Mainly olympic distance and 70.3s and potentially IM eventually. Can DM you other fit images with me on it if helpful?
Many thanks.
OK, let me work on this… do you have a picture of you on the bike?
Hi Eric,
I’ve attached my last Tri bike fit. Apologies as the measurements are different to the ones you specify.
Sadly don’t have this anymore so can’t input the x and y coordinates you refer to. Had a look at my road bike but not all that helpful.
It was a 54 P2, I’m 176.5cm and longer torso and shorter legs. Bars were 3T aura pro. I have long arms. Saddle height is 77cm from BB. Looking at pics of me on this I do wonder if it was a bit small as knees and elbows were a bit close.
Interested in a new p series, p3x or p5d, whichever fits best. Mainly olympic distance and 70.3s and potentially IM eventually. Can DM you other fit images with me on it if helpful?
Many thanks.
OK, let me work on this… do you have a picture of you on the bike?
Hi Eric,
Thanks for getting back to me, much appreciated. Please see attached fit photos.
I guess it depends on what you’re intending to do with your bike… not that both bikes can’t do all triathlons.
P3x incentivizes long course athletes with fluids and calories. With a Pad Stack of 640 and Pad Reach of 450 you could fit on M or an L, sort of “high mid-forward” on the M and “middle back” on the L.
P5 is likely faster in a “light” configurations… you’d be a 54cm or a 56cm… “high-mid” on the 54cm and “mid-back” on the 56cm.
Do you have a pic from your fitter? My recommendation would depend on where you might go with your position in the future.
Eric
Eric, I’m trying to decide between a P5 and a P3X
A fitter last night placed my Pad Y at 640 but I have been riding 660
Pad X (Rear) is 450
Sorry, I don’t know the Pad Z
Saddle height is 795
Thanks for the help!
I went with the P3X medium and I think the “high mid-forward” position is causing the bike to be more responsive than I would like.
In your opinion, if I move up to a large frame would that solve my handling problem?
Hi Eric,
I’ve attached my last Tri bike fit. Apologies as the measurements are different to the ones you specify.
Sadly don’t have this anymore so can’t input the x and y coordinates you refer to. Had a look at my road bike but not all that helpful.
It was a 54 P2, I’m 176.5cm and longer torso and shorter legs. Bars were 3T aura pro. I have long arms. Saddle height is 77cm from BB. Looking at pics of me on this I do wonder if it was a bit small as knees and elbows were a bit close.
Interested in a new p series, p3x or p5d, whichever fits best. Mainly olympic distance and 70.3s and potentially IM eventually. Can DM you other fit images with me on it if helpful?
Many thanks.
OK, let me work on this… do you have a picture of you on the bike?
Hi Eric,
Thanks for getting back to me, much appreciated. Please see attached fit photos.
Thanks. I think I get it now…
OK, so before we begin you need to know what my fit philosophy and what my priors and tendencies are, as that knowledge will help you understand what I’m going to tell you and also how I might be different or the same as other fitters.
Generally, I feel like you should always use the right tool for the job, that your bike should work for you and not you for your bike, that you should always get the fastest bike for the purpose (or future purpose!) all things being equal, and finally and most importantly as it relates to fit and orthodoxy I feel that you should always get the longest bike possible that is still able to get low enough for your position (or future position!).
This last part is pertinent because I tend to trend longer than my peers with bike fits, which then leads to clients being on a bike one size bigger than they thought, than their peers thought, or their LBS thought they should be on. IMO, there’s no point in a bike that’s too small/short! Spacers under stems are not a good idea, unless you are a UCI Pro Tour cyclist doing an ITT in which case I could make the point that smaller is better, for a number of reasons that don’t really apply to us and merit passing over here. Too long OTOH, as long as it’s low enough, is like having money in the bank for a rainy day in the future. If your position change (and it almost always changes in my direction), your bike will work for your new position. If you get a too small bike, it won’t. This reasoning also informs which bike you choose. Your focus is short/medium now, but an IM is in your eventual future. Pick the bike that can do all three as functionally and as aerodynamically as possible.
Now, you’re admittedly a long torso guy, you thought your bike was a little too small from your perspective, and then finally me looking at your pics I felt the same way. I’d call that good supporting evidence for a decision. You could do with a longer bike. “But you’re only 5’9”!" Don’t listen to them. The bike works for you, not the other way around. We’ll put your contact points in space and bring the bike up to meet them as functionally and as aerodynamically as possible. The size of the bike compared to your height is irrelevant when you’re on a well designed well built bike doing triathlon. If it fits it fits.
I’m estimating your current pad stack and reach is 630mm pad stack, 435mm pad reach. I feel like you could be about 50mm longer once you figure your fit out. You need a bike that is able to hit 485mm to back of pad eventually. Your current fit would be a 54cm P5d, but as you add reach you move into the 56cm P5d realm. The minimum reach for a 56cm P5d at your pad stack height is 448mm. I feel very confident that you could handle a sudden 15mm increase in reach if purchasing the P5d as a new bike. I don’t feel confident that a 54cm would serve your needs in the future as your fit evolves.
By that rationale, and with those coordinates, you’d fit a size M or size L P3x, and you’d lean toward the size L. Minimum pad reach for the size L P3x is 430mm for you, so already within range, and goes out to a whopping 510mm at your stack height. This is your bike… size L. The P3x would carry and store all your nutrition, hydration, and flat kit stuff for an IM but would be plenty fast and functional for OD or 70.3. Actually, in the times of COVID and what I think racing will look like going forward, the ability to do a half IM self-supported will be useful as well. Self-supported but totally aero storage for the various bottles you’d need to port for a self-supported HIM.
Does all of this make sense? I’m not saying a P5d can’t be kitted out to do an IM, just that the P3x would do it as well as the short course stuff just as easy. Same with the sizing recommendations… do those make sense as well? Let me know.
thanks,
Eric
I guess it depends on what you’re intending to do with your bike… not that both bikes can’t do all triathlons.
P3x incentivizes long course athletes with fluids and calories. With a Pad Stack of 640 and Pad Reach of 450 you could fit on M or an L, sort of “high mid-forward” on the M and “middle back” on the L.
P5 is likely faster in a “light” configurations… you’d be a 54cm or a 56cm… “high-mid” on the 54cm and “mid-back” on the 56cm.
Do you have a pic from your fitter? My recommendation would depend on where you might go with your position in the future.
Eric
Eric, I’m trying to decide between a P5 and a P3X
A fitter last night placed my Pad Y at 640 but I have been riding 660
Pad X (Rear) is 450
Sorry, I don’t know the Pad Z
Saddle height is 795
Thanks for the help!
I went with the P3X medium and I think the “high mid-forward” position is causing the bike to be more responsive than I would like.
In your opinion, if I move up to a large frame would that solve my handling problem?
I Tom, thanks for reaching back out.
I would never recommend not moving to the longer bike for a variety of reasons, not the least of which handling. I’m not 100% sure however that a larger bike will solve your handling issues, but I think by “responsive” you mean twitchy, and if so longer would probably help. The size L has a 30mm longer wheelbase, all in the front/center so you’d likely notice this.
Also, in the pic you attached, you have a very solid fit. However, and FWIW, I personally would certainly like you to be a touch longer and could easily see you getting longer in the future as you settle in to and learn how to sit on your saddle. You could also even come up some. Using that mental model, and the new numbers you provided, I think the size L P3x would be better for you. It would accommodate your current position in the mid-mid quadrant/range and be there for you if you lean into your bars a bit and get a little longer.
So it’s a win-win from position and handling perspectives for the size L P3x.
Make sense?
Eric
I Tom, thanks for reaching back out.
I would never recommend not moving to the longer bike for a variety of reasons, not the least of which handling. I’m not 100% sure however that a larger bike will solve your handling issues, but I think by “responsive” you mean twitchy, and if so longer would probably help. The size L has a 30mm longer wheelbase, all in the front/center so you’d likely notice this.
Also, in the pic you attached, you have a very solid fit. However, and FWIW, I personally would certainly like you to be a touch longer and could easily see you getting longer in the future as you settle in to and learn how to sit on your saddle. You could also even come up some. Using that mental model, and the new numbers you provided, I think the size L P3x would be better for you. It would accommodate your current position in the mid-mid quadrant/range and be there for you if you lean into your bars a bit and get a little longer.
So it’s a win-win from position and handling perspectives for the size L P3x.
Make sense?
Eric
That does make sense. Thanks for such a fast response. Your points about how my position might change mirror the conversation that I had with the fitter, so you definitely have a good eye for it.
It really helps to have a little confirmation before I drop that kind of money a second time.
On the up-side, I switched the medium sized bike over to LOML size and she absolutely loves it and is threatening to not give it back, so at least it has a good home.
That does make sense. Thanks for such a fast response. Your points about how my position might change mirror the conversation that I had with the fitter, so you definitely have a good eye for it.
It really helps to have a little confirmation before I drop that kind of money a second time.
On the up-side, I switched the medium sized bike over to LOML size and she absolutely loves it and is threatening to not give it back, so at least it has a good home.
Awesome, and thanks!!!
Hi Eric,
I’ve attached my last Tri bike fit. Apologies as the measurements are different to the ones you specify.
Sadly don’t have this anymore so can’t input the x and y coordinates you refer to. Had a look at my road bike but not all that helpful.
It was a 54 P2, I’m 176.5cm and longer torso and shorter legs. Bars were 3T aura pro. I have long arms. Saddle height is 77cm from BB. Looking at pics of me on this I do wonder if it was a bit small as knees and elbows were a bit close.
Interested in a new p series, p3x or p5d, whichever fits best. Mainly olympic distance and 70.3s and potentially IM eventually. Can DM you other fit images with me on it if helpful?
Many thanks.
OK, let me work on this… do you have a picture of you on the bike?
Hi Eric,
Thanks for getting back to me, much appreciated. Please see attached fit photos.
Thanks. I think I get it now…
OK, so before we begin you need to know what my fit philosophy and what my priors and tendencies are, as that knowledge will help you understand what I’m going to tell you and also how I might be different or the same as other fitters.
Generally, I feel like you should always use the right tool for the job, that your bike should work for you and not you for your bike, that you should always get the fastest bike for the purpose (or future purpose!) all things being equal, and finally and most importantly as it relates to fit and orthodoxy I feel that you should always get the longest bike possible that is still able to get low enough for your position (or future position!).
This last part is pertinent because I tend to trend longer than my peers with bike fits, which then leads to clients being on a bike one size bigger than they thought, than their peers thought, or their LBS thought they should be on. IMO, there’s no point in a bike that’s too small/short! Spacers under stems are not a good idea, unless you are a UCI Pro Tour cyclist doing an ITT in which case I could make the point that smaller is better, for a number of reasons that don’t really apply to us and merit passing over here. Too long OTOH, as long as it’s low enough, is like having money in the bank for a rainy day in the future. If your position change (and it almost always changes in my direction), your bike will work for your new position. If you get a too small bike, it won’t. This reasoning also informs which bike you choose. Your focus is short/medium now, but an IM is in your eventual future. Pick the bike that can do all three as functionally and as aerodynamically as possible.
Now, you’re admittedly a long torso guy, you thought your bike was a little too small from your perspective, and then finally me looking at your pics I felt the same way. I’d call that good supporting evidence for a decision. You could do with a longer bike. “But you’re only 5’9”!" Don’t listen to them. The bike works for you, not the other way around. We’ll put your contact points in space and bring the bike up to meet them as functionally and as aerodynamically as possible. The size of the bike compared to your height is irrelevant when you’re on a well designed well built bike doing triathlon. If it fits it fits.
I’m estimating your current pad stack and reach is 630mm pad stack, 435mm pad reach. I feel like you could be about 50mm longer once you figure your fit out. You need a bike that is able to hit 485mm to back of pad eventually. Your current fit would be a 54cm P5d, but as you add reach you move into the 56cm P5d realm. The minimum reach for a 56cm P5d at your pad stack height is 448mm. I feel very confident that you could handle a sudden 15mm increase in reach if purchasing the P5d as a new bike. I don’t feel confident that a 54cm would serve your needs in the future as your fit evolves.
By that rationale, and with those coordinates, you’d fit a size M or size L P3x, and you’d lean toward the size L. Minimum pad reach for the size L P3x is 430mm for you, so already within range, and goes out to a whopping 510mm at your stack height. This is your bike… size L. The P3x would carry and store all your nutrition, hydration, and flat kit stuff for an IM but would be plenty fast and functional for OD or 70.3. Actually, in the times of COVID and what I think racing will look like going forward, the ability to do a half IM self-supported will be useful as well. Self-supported but totally aero storage for the various bottles you’d need to port for a self-supported HIM.
Does all of this make sense? I’m not saying a P5d can’t be kitted out to do an IM, just that the P3x would do it as well as the short course stuff just as easy. Same with the sizing recommendations… do those make sense as well? Let me know.
thanks,
Eric
Hi Eric,
Thank you very much for that really helpful and informative breakdown. Yes, it all makes complete sense and sorry for making it a bit more challenging by not having the fit coordinates. I think the future proofing element is also great advice. I agree and think the P3X in L is the way to go👠Thank you again for your time and assistance.
Hi all,
reposting from another thread as suggested 
I can get a good deal on a P3X and am undecided between a L and XL (leaning towards XL now).
Arm Pad Stack 680-690mm (depending on distance and not getting any younger)
Arm Pad Reach 450mm (BB to back of pad)
Saddle Height 820mm (from BB, 175mm cranks)
I was contemplating buying L, but the sales guy from a reputable dealer (and being a Cat 1 cyclist himself) is 95% sure the XL would be the way to go. I am ~1.92m tall (6 foot 3), long legs, short torso. Both look feasible from the Cervelo site with my measurements being towards the low end of the XL spectrum. I am currently riding a 2006 P3C in 58cm with a medium Zipp Vuka Stealth in a fairly backward set-up.
I could return and change the P3X, but obviously would prefer to get it right first time.
Can post pictures later today if helpful).
Any suggestions and opinions welcome … thanks in advance!
Hi all,
reposting from another thread as suggested
I can get a good deal on a P3X and am undecided between a L and XL (leaning towards XL now).
Arm Pad Stack 680-690mm (depending on distance and not getting any younger)
Arm Pad Reach 450mm (BB to back of pad)
Saddle Height 820mm (from BB, 175mm cranks)
I was contemplating buying L, but the sales guy from a reputable dealer (and being a Cat 1 cyclist himself) is 95% sure the XL would be the way to go. I am ~1.92m tall (6 foot 3), long legs, short torso. Both look feasible from the Cervelo site with my measurements being towards the low end of the XL spectrum. I am currently riding a 2006 P3C in 58cm with a medium Zipp Vuka Stealth in a fairly backward set-up.
I could return and change the P3X, but obviously would prefer to get it right first time.
Can post pictures later today if helpful).
Any suggestions and opinions welcome … thanks in advance!
Hi, thanks for reaching out.
Pictures always help, but I think I have some ideas…
With a Pad Stack of 690mm you’re pretty close to the top of the range for the size L P3x, but only the top 33% for the size XL. Upper mid quadrant.
OTOH 450mm Pad Reach to back of pad is just on the grid for the XL. You’d be in the mid to upper left quadrant. Sort of hints at the size L for you.
Something seems off though… you’re 1.92 meters tall but only 450mm of reach, slightly different from orthodox IMO, and much different than me (1.9 meters) slightly “alien” w/ roughly 540mm of reach (including -8cm of saddle setback).
I think your Cat 1 cyclist sales guy dealer is right, but I can’t vouch for his reasoning. My reasoning is that you’ll most likely never want to go less than 450mm of reach, but could quite conceivably, with perhaps a saddle intervention or a bike fit from a person with a different perspective (which means some postural coaching), go fairly longer than 450mm. At your pad stack height, you only have 40mm more to work with on the size L.
I think I’m trying to tell you that despite your age, and despite me not having seen a picture of you, that you could probably get a bit longer, both from an orthodoxy doctrine and from my own fit philosophy. It might not happen, but if it does… this line of reasoning would be better achieved on the XL IMO.
Make sense?
Eric
Hi all,
reposting from another thread as suggested
I can get a good deal on a P3X and am undecided between a L and XL (leaning towards XL now).
Arm Pad Stack 680-690mm (depending on distance and not getting any younger)
Arm Pad Reach 450mm (BB to back of pad)
Saddle Height 820mm (from BB, 175mm cranks)
I was contemplating buying L, but the sales guy from a reputable dealer (and being a Cat 1 cyclist himself) is 95% sure the XL would be the way to go. I am ~1.92m tall (6 foot 3), long legs, short torso. Both look feasible from the Cervelo site with my measurements being towards the low end of the XL spectrum. I am currently riding a 2006 P3C in 58cm with a medium Zipp Vuka Stealth in a fairly backward set-up.
I could return and change the P3X, but obviously would prefer to get it right first time.
Can post pictures later today if helpful).
Any suggestions and opinions welcome … thanks in advance!
Hi, thanks for reaching out.
Pictures always help, but I think I have some ideas…
With a Pad Stack of 690mm you’re pretty close to the top of the range for the size L P3x, but only the top 33% for the size XL. Upper mid quadrant.
OTOH 450mm Pad Reach to back of pad is just on the grid for the XL. You’d be in the mid to upper left quadrant. Sort of hints at the size L for you.
Something seems off though… you’re 1.92 meters tall but only 450mm of reach, slightly different from orthodox IMO, and much different than me (1.9 meters) slightly “alien” w/ roughly 540mm of reach (including -8cm of saddle setback).
I think your Cat 1 cyclist sales guy dealer is right, but I can’t vouch for his reasoning. My reasoning is that you’ll most likely never want to go less than 450mm of reach, but could quite conceivably, with perhaps a saddle intervention or a bike fit from a person with a different perspective (which means some postural coaching), go fairly longer than 450mm. At your pad stack height, you only have 40mm more to work with on the size L.
I think I’m trying to tell you that despite your age, and despite me not having seen a picture of you, that you could probably get a bit longer, both from an orthodoxy doctrine and from my own fit philosophy. It might not happen, but if it does… this line of reasoning would be better achieved on the XL IMO.
Make sense?
Eric
hi Eric, many thanks
Yes, it absolutely makes sense. Here are some pics - if they are too close, I’d need to move the trainer to a bigger room and re-take.
I think I could potentially move the saddle forward another 10-15mm and the position looks a bit tight to my amateur eyes (although it’s quite comfortable to me and I had fairly decent IM splits - 5:01 and 5:03 with low 190s NP on flat courses). Getting slightly lower for 5h is possible, but will take me some time. I’d say the chance of me wanting to go to less than 450mm pad reach is about nil - I’d probably have the legs hitting my elbows.
Eric
Still looking at P5…my Cervelo P4 fit in October 2019 was Arm Pad Reach 425, Arm Pad Stack 636, and Seat Height of 715 on a 172.5 crank (standard). When I put those numbers in the Cervelo size chart it says both 51 and 54 work. My P4 is a 51…but maybe I should be on a 54 now with shorter cranks? Thanks, Dirk
Thanks again for your help!
I pulled the trigger on the XL and now need to get a new PM (bike shop happy to install the PM during the build). Currently on 175mm, but thinking of getting 170 or 165 cranks … is it just a matter of increasing the seat height and pad stack by the difference in crank length?
Hi all,
reposting from another thread as suggested
I can get a good deal on a P3X and am undecided between a L and XL (leaning towards XL now).
Arm Pad Stack 680-690mm (depending on distance and not getting any younger)
Arm Pad Reach 450mm (BB to back of pad)
Saddle Height 820mm (from BB, 175mm cranks)
I was contemplating buying L, but the sales guy from a reputable dealer (and being a Cat 1 cyclist himself) is 95% sure the XL would be the way to go. I am ~1.92m tall (6 foot 3), long legs, short torso. Both look feasible from the Cervelo site with my measurements being towards the low end of the XL spectrum. I am currently riding a 2006 P3C in 58cm with a medium Zipp Vuka Stealth in a fairly backward set-up.
I could return and change the P3X, but obviously would prefer to get it right first time.
Can post pictures later today if helpful).
Any suggestions and opinions welcome … thanks in advance!
Hi, thanks for reaching out.
Pictures always help, but I think I have some ideas…
With a Pad Stack of 690mm you’re pretty close to the top of the range for the size L P3x, but only the top 33% for the size XL. Upper mid quadrant.
OTOH 450mm Pad Reach to back of pad is just on the grid for the XL. You’d be in the mid to upper left quadrant. Sort of hints at the size L for you.
Something seems off though… you’re 1.92 meters tall but only 450mm of reach, slightly different from orthodox IMO, and much different than me (1.9 meters) slightly “alien” w/ roughly 540mm of reach (including -8cm of saddle setback).
I think your Cat 1 cyclist sales guy dealer is right, but I can’t vouch for his reasoning. My reasoning is that you’ll most likely never want to go less than 450mm of reach, but could quite conceivably, with perhaps a saddle intervention or a bike fit from a person with a different perspective (which means some postural coaching), go fairly longer than 450mm. At your pad stack height, you only have 40mm more to work with on the size L.
I think I’m trying to tell you that despite your age, and despite me not having seen a picture of you, that you could probably get a bit longer, both from an orthodoxy doctrine and from my own fit philosophy. It might not happen, but if it does… this line of reasoning would be better achieved on the XL IMO.
Make sense?
Eric
hi Eric, many thanks
Yes, it absolutely makes sense. Here are some pics - if they are too close, I’d need to move the trainer to a bigger room and re-take.
I think I could potentially move the saddle forward another 10-15mm and the position looks a bit tight to my amateur eyes (although it’s quite comfortable to me and I had fairly decent IM splits - 5:01 and 5:03 with low 190s NP on flat courses). Getting slightly lower for 5h is possible, but will take me some time. I’d say the chance of me wanting to go to less than 450mm pad reach is about nil - I’d probably have the legs hitting my elbows.
5hrs on 190w AP is pretty good! I’d say you’re doing something right. If you got a P3x with the tilt option you could get longer “for free” and perhaps squeeze out some more time to get under 5hrs thru some Cd savings.
Eric
Thanks again for your help!
I pulled the trigger on the XL and now need to get a new PM (bike shop happy to install the PM during the build). Currently on 175mm, but thinking of getting 170 or 165 cranks … is it just a matter of increasing the seat height and pad stack by the difference in crank length?
Awesome. Let me know how it goes. 165mm cranks! Increase seat height, increasing pad stack by similar amount optional. Increase reach instead.
Eric
Eric
Still looking at P5…my Cervelo P4 fit in October 2019 was Arm Pad Reach 425, Arm Pad Stack 636, and Seat Height of 715 on a 172.5 crank (standard). When I put those numbers in the Cervelo size chart it says both 51 and 54 work. My P4 is a 51…but maybe I should be on a 54 now with shorter cranks? Thanks, Dirk
For a P5d, with a pad stack of 636mm and a pad reach of 425mm, you’re sort of upright and in the very upper left quadrant of a 51cm P5d. Not even on the 54cm chart, but only by a few millimeters. You’re very high for a 51cm P4 and also a 51cm P5d.
Because you’re so far in the upper left quadrant of a 51cm P5d, and have a high stack in the absolute sense as well, I’m guessing you’re a bit “unorthodox”, and could stand to be less “slack” or more forward, and if so you’d hit the 54cm chart and be more in the upper third with regard to stack.
Can you post a pic of you and your P4? That might help. Aside from that I’d lean toward the 54cm P5d and work on your fit, saddle choice, and crank length.
Eric
Eric - Many many thanks. My bike fitter is Retul certified and well known (I am sure you know him). He has said the P4 has limitations and based on everything (bike adjustability, body, cranks, etc) my fit is best outcome. So you both are matching in thoughts (great minds think alike). I like this forum so wanted to check with you. I am traveling, Northwoods Country Inn with wife, and will drop you some pictures in a few days. Thinking cranks…Shimano makes a 165mm but nothing shorter that I have seen. Given my 5’7â€â€ frame do you like a manufacturer that makes a shorter crank that works with Di2? Thanks again…