Jgills,
Also call Cynthia Stewart at Bike Barn 713.522.8911. I just had an email exchange with her that tells me she’s a top drawer fitter.
Ian
Hi Ian. I’m considering a PRfour Disc within the next several months. The default table seems to suggest a 54 or 56. My measurements are:
Overall Height (cm) 181.2
Inseam (cm) 88.5
Torso Length (cm) 59.0
Overall Arm Length (cm) 187.0
Shoulder Width (cm) 41.5
Much appreciated!
domingjm,
I’m gonna put your Pad Y at about 634 and your Pad X rear at about 450. And if those numbers are right (knowing your current saddle height on road or tri would help me be more certain) I think you should be on a 52cm PRfour with a 90mm stem in the -17 configuration, 5mm of spacer under the stem, and arm cups mounted one hole back of center and in the forward bracket holes.
You could get this done on a 54cm but you’d be up against the wall in terms of Pad Stack (lowest possible).
Ian
Hi Ian. I’m considering a PRfour Disc within the next several months. The default table seems to suggest a 54 or 56. My measurements are:
Overall Height (cm) 181.2
Inseam (cm) 88.5
Torso Length (cm) 59.0
Overall Arm Length (cm) 187.0
Shoulder Width (cm) 41.5
Much appreciated!
domingjm,
I’m gonna put your Pad Y at about 634 and your Pad X rear at about 450. And if those numbers are right (knowing your current saddle height on road or tri would help me be more certain) I think you should be on a 52cm PRfour with a 90mm stem in the -17 configuration, 5mm of spacer under the stem, and arm cups mounted one hole back of center and in the forward bracket holes.
You could get this done on a 54cm but you’d be up against the wall in terms of Pad Stack (lowest possible).
Ian
Awesome, thanks. Do you measure saddle height from the center of the cranks, along the seat tube? Please note that I prefer a pretty aggressive position.
Awesome, thanks. Do you measure saddle height from the center of the cranks, along the seat tube?
Center of bottom bracket (where cranks spin around) to the top of the saddle in the middle - just a straight line, ignore seat tube.
Ian,
Thanks so much for all of the assistance you Provide! It’s very much appreciated and valued!
I’m coming from a 54cm Scott plasma 10 (the UCI legal 4 frameset). I had been on it for 4 years now and finding that It was putting me into a very quad dominant position and affecting my run off the bike. I’ve been re fit on my current set up and there is NO way that it is going to work. So here is what we came up with. I’m 5’11" with a 32.75 inch inseam. 175 lbs. One thing is the need to focus on keeping hips open as I’m just coming off FAI Cam impingement surgery (Where they shave your femur down), Micro fracturing and Torn hip Labrum repair surgery on top of Osteitis Pubis and multiple stress fractures of my pelvis. I’m quite flexible. Riding a Cobb Plus Saddle.
Pad Stack 659
Pad reach 426
Saddle Height 767
Saddle Setback 11
Saddle to Pad Drop 155
Saddle to Pad Reach 483
Grip reach 742
Grip drop 82
Grip angle 48
Arm pad to grip 347
BB to Grip 773
Arm pad Drop -100
I’m a distance guy. I’m OK at the game. I’m open to any and evey suggestion to get me to that finish line faster! Aero and comfortable enough to run a fast marathon off the bike!
Once again, THANK YOU!!
I’m looking at buying a PRfive, size 56cm, based on what I can make of their sizing. My current fit is on a 61cm Cervelo P3 with 165mm cranks.
Pad Y = 685mm
Pad X = 478mm (pad rear) or 529mm (pad middle)
Pad Z = 133mm (inside edge to inside edge)
Saddle Drop to Pad 84mm
My inseam is 925mm
Does the 56cm frame sound correct?
Pad Stack 659
Pad reach 426
Saddle Height 767
Saddle Setback 11
Saddle to Pad Drop 155
Saddle to Pad Reach 483
Grip reach 742
Grip drop 82
Grip angle 48
Arm pad to grip 347
BB to Grip 773
Arm pad Drop -100
mpkellyjunior,
There’s some good info in here (beyond the numbers), thank you - the more I know the better I can prescribe. You’re leggy and that makes the reach aspect of your fit short and it complicates things slightly. I fit lots of people built like this, I’m built like this so don’t freak out when you, a guy who’s 5’11", the frame size I’m about to lay down here (it’s 'cause of your morphology and that 426)
If you get a QR PRsix (the super bike) it’s a a size 50, with the 90mm stem, the stem clamp shell in the “high” position, 65mm of pedestal, arm rest in the middle hole with the bracket rearward.
If you get a QR PRfive or foure it’s a size 52, with a 70mm stem in the -17 configuration, with 10mm of armrest riser, with armrests mounted one hole back from middle.
Now, with the hip focus - combined with 100m of drop - I want to suggest…nay, insist that you go with short cranks (155s). One option is that you call QR within your order and get a set of Rotor 155 cranks installed on that bike before ship. Later, if you l like you can get Rotor’s new INspider powermeter worked into that.
I’m here if/when you have questions, comments.
Ian
I’m looking at buying a PRfive, size 56cm, based on what I can make of their sizing. My current fit is on a 61cm Cervelo P3 with 165mm cranks.
Pad Y = 685mm
Pad X = 478mm (pad rear) or 529mm (pad middle)
Pad Z = 133mm (inside edge to inside edge)
Saddle Drop to Pad 84mm
My inseam is 925mm
Does the 56cm frame sound correct?
David_Tris,
Well, it will work on the 56 and the 58.5. Let me 'scribe 'em both and we can discuss.
If it’s the 56… 90mm stem in the -17deg position, 5mm of armrest risers, 30mm of stem spacer height, and pads mounted one hole away from the saddle from the center hole.
If it’s the 58.5… 90mm stem in the -17deg position, 5mm of armrest risers, zero stem spacer height, and pads mounted one hole back towards the saddle from the center hole.
this is a VERY tough call - both setups are excellent. For me there’s one tiny aspect that tips me towards the 58.5 and it’s that I like the stem slammed more than I like 30mm of spacer, 30mm of spacer is acceptable for sure but not my preference.
Thoughts?
Ian
Dude - 9:00pm and you’re helping folks, you rock!
It’s a used 56cm PR5, so this was more of a “I’m not limiting myself, am I” kind of question. My P3 has 10mm under the bar and another 20mm above, and I’ve got the DI2 junction hiding behind it. So I guess I’m used to not being slammed. I have a Torhans bento that covers that junction box and kind of hides the fact that it’s not slammed. As long as I can get the reach I need, I could be OK with this spec. I’ve been on an undersized bike before, and do not want to be there again. FWIW I’m 64 and not as flexible as some cough cough younger riders.
Could I slam the base bar and add more spacers to the aero bars/pads and get the same fit?
Could I slam the base bar and add more spacers to the aero bars/pads and get the same fit?
That’s an option but for TT I’m fine with a big disparity between the basebar elevation and the aerobars - for Tri I like the base bar and the aerobars to be closer in height. You should go for with the 56, sounds like it’s a great find!
Ian
PS. only 7pm in California.
Ian,
Thanks for the VERY detailed respose! I can’t thank you enough. But I’m a bit confused…I had dissected my numbers myself and would have put muself on a 52cm with either the PR5 or PR6, I’m a numbers nerd but no pro hence I go see the best fitter I can find. My fitter just threw me a curveball and sent me over an email stating he liked the idea of a 54cm PR5 with a 90mm stem and minimal spacers below stem and 20mm pedestal under pads (the most I am personally comfortable with). I am certainly NOT discounting anyones opinion, I am trying to be as informed as I possibly can to make the best decision I can for myself. Does your opinion change at all if I tell you that I made a mistake and one I forgot to add the 20mm (Measured with 100mm stem when it should have been 1200mm stem. Yes that how poor The Plasma fit me) and specified that my 426mm Pad reach was to the back of the bars and should actually have read 446 and my mid pad reach was 488mm? Does this look a little more normal morphology? HA! And thank you very much for the suggestion of the 155mm Crankset, It was discussed during my fit session. I would have not have thought about asking for it at point of purchase through QR!
So it should actually read
Pad Stack 659
Pad reach 446
Pad reach mid pad 488
Saddle Height 767
Saddle Setback 11
Saddle to Pad Drop 155
Saddle to Pad Reach 483
Grip reach 742
Grip drop 82
Grip angle 48
Arm pad to grip 347
BB to Grip 773
Arm pad Drop -100******
******
Pad Stack 659
Pad reach 426
Saddle Height 767
Saddle Setback 11
Saddle to Pad Drop 155
Saddle to Pad Reach 483
Grip reach 742
Grip drop 82
Grip angle 48
Arm pad to grip 347
BB to Grip 773
Arm pad Drop -100
mpkellyjunior,
There’s some good info in here (beyond the numbers), thank you - the more I know the better I can prescribe. You’re leggy and that makes the reach aspect of your fit short and it complicates things slightly. I fit lots of people built like this, I’m built like this so don’t freak out when you, a guy who’s 5’11", the frame size I’m about to lay down here (it’s 'cause of your morphology and that 426)
If you get a QR PRsix (the super bike) it’s a a size 50, with the 90mm stem, the stem clamp shell in the “high” position, 65mm of pedestal, arm rest in the middle hole with the bracket rearward.
If you get a QR PRfive or foure it’s a size 52, with a 70mm stem in the -17 configuration, with 10mm of armrest riser, with armrests mounted one hole back from middle.
Now, with the hip focus - combined with 100m of drop - I want to suggest…nay, insist that you go with short cranks (155s). One option is that you call QR within your order and get a set of Rotor 155 cranks installed on that bike before ship. Later, if you l like you can get Rotor’s new INspider powermeter worked into that.
I’m here if/when you have questions, comments.
Ian
mpkellyjunior,
I forgot to add the 20mm (Measured with 100mm stem when it should have been 1200mm stem.
I know from context that you mean a 120mm stem and not a 1,200mm stem. This is how the Mars Rover crashed into the surface of that planet 
No, seriously, the stem length didn’t/dosen’t really matter to me. Here’s the evidence I’m working with in your post: you had a fit done, it’s a fit that you believe in, and from that fit you know that your Pad Stack is 659 and your Pad Reach is 426. If I’ve got Pad Y and Pad X from a good fit - that’s the best data we can have and we should be confident moving forward with that. And, by the way, you didn’t specify that the 426 was to the back of the pad, but I knew because that number’s too short to be to center of pad. It does matter a great deal if you’re talking about the PRsix or the PRfive as they are complete different bikes due to the super front end on the PRsix.
But…now that we know that your real Pad Reach is 446 and we know you’re focusing on the PRfive…
It’s common that a person can fit on 2 different sizes of bike - sometimes 3 or even 4. In those extreme cases we can typically toss the outliers and narrow it down, but we often find ourselves in a place where two different frame sizes can work and work well. And then you can commit to a size of bike (a 54 for example) and then have two, three different ways to get your pads pretty darn close to where you need 'em on that size bike. It’s RARE that we can hit your exact number and that’s okay because 1 or 2 or 3mm off is acceptable.
For example this set up results in Pad Y of 656 & Pad X of 447
Size 52… 90mm stem, -17 degree configuration, 30mm of spacer under stem, 15mm of armrest risers, back of armrests offset -32.5mm
My fitter…sent me over an email stating he liked the idea of a 54cm PR5 with a 90mm stem and minimal spacers below stem and 20mm pedestal under pads
Well, If I math out that set up: a 54 with a 90mm stem in the -17 config with zero spacers under stem and 15mm of pedestal (the max that can be done based on my info here) you’d come out with a Pad Y of 652. That’s 8mm off your number and it results in a drop of 108 when you are spec’d with a drop of 100.
If you went a 54cm PRfive with a 90mm stem, in the -17 config with 20mm of spacers below the stem and 10mm of armrest riser you can get a Pad Stack of 661 - which is 1mm off your number. With that Pad Y nailed down now you can choose between a 442 or 450 in Pad Reach. One of those numbers is 4mm shorter than you wanted and one of those numbers is 4mm longer than you wanted. I, as a fitter, would now reflect back on the fit and consider these two questions:
- Does this athlete (you) require a more precise drop or a more precise cockpit distance?
- Where were did the elbows of this athlete (you) sit on the pad (or off the pad) in the final position and would it be okay if the cockpit was a bit longer or a bit shorter?
The absolute closest we can get to your numbers (659-446) is 657 and 445 and that’s a 54, 90mm stem, -17, 10mm spacer under stem, 15mm spacer under armrests, armrest offset -55mm.
I’m here, get back to me with more questions if/when you have 'em.
Ian
Ian,
I’m back! And thanks for ALL of your help. I ended up with a 54cm PR6 Disc for myself which arrives tomorrow. I’m pretty excited! But now were onto a new rig for my lovely wife. She finished her fit Yesterday, and were now going through the options. She was previously on a 51cm C’Dale slice with 165mm crankset and was feeling crammed. The bike just looked small on her. The last 2 years although still very flexible, she has pretty consistent issues with tight Hip Flexors and Hamstrings.
She’s 5’5.5"
Saddle Heigh 722
Reach to Back of Armpad 406
Stack to top of Armpad 619
Again, were trying to keep the number of spacers underneath the stem and pedestals under pads to a minimum. I’m trying to get her to as perfect of fit as possible. Give her every chance for success! Your thoughts?
Thanks!!
Ian,
I’m back! And thanks for ALL of your help. I ended up with a 54cm PR6 Disc for myself which arrives tomorrow. I’m pretty excited! But now were onto a new rig for my lovely wife. She finished her fit Yesterday, and were now going through the options. She was previously on a 51cm C’Dale slice with 165mm crankset and was feeling crammed. The bike just looked small on her. The last 2 years although still very flexible, she has pretty consistent issues with tight Hip Flexors and Hamstrings.
She’s 5’5.5"
Saddle Heigh 722
Reach to Back of Armpad 406
Stack to top of Armpad 619
Again, were trying to keep the number of spacers underneath the stem and pedestals under pads to a minimum. I’m trying to get her to as perfect of fit as possible. Give her every chance for success! Your thoughts?
mpkellyjunior,
If she was to get a PRsix like yours, and you wanted to minimize spacers… 50cm with a 75mm stem, the high stem position, with only 5mm of arm pad pedestal, the bracket rearward, and mid-front armrest hole. This could also be done on a 52cm with a 75mm stem, the mid stem position, with zero arm pad pedestal, the bracket rearward, and the front armrest hole. That set up on the 52cm is pretty much rock bottom on the position; there’s almost no way go to lower than that.
If she was to get PRfive or PRfour then it could be a 48cm bike with a 70mm stem in the -17deg position, 30mm of spacer under stem, 10mm of aerobar pedestal, armrest offset of -25mm. If she went with the 50cm it would still be the 70mm stem, -17deg pitch but then only 10mm under stem and 5mm of pedestal, and then armrest off set -40mm - again the 50cm bike is nearly at the bottom in terms of adjust ability.
Ian
Hello Ian,
i just recently had bike fit done, but i’m not sure I trust the results. Could you take a look and see if it is realistic numbers? PadX looks quite low for me.
I’m 5’10’’ tall.
Currently riding 54cm road bike (trek domane alr) which seems to be ok. I’m looking for PR4 Disk
Current saddle height is 698.
The Retul results for Tri bike:
Saddle Height: 687
Saddle setback: -42
Arm Pad Stack BB: 703
Arm Pad Reach BB: 248
Arm Pad Reach: 289
Arm Pad Drop: 37
Frame Stack: 611
Frame Reach: 359
Thank you
Oleg
Hello Ian,
i just recently had bike fit done, but i’m not sure I trust the results. Could you take a look and see if it is realistic numbers? PadX looks quite low for me.
I’m 5’10’’ tall.
Currently riding 54cm road bike (trek domane alr) which seems to be ok. I’m looking for PR4 Disk
Current saddle height is 698.
The Retul results for Tri bike:
Saddle Height: 687
Saddle setback: -42
Arm Pad Stack BB: 703
Arm Pad Reach BB: 248
Arm Pad Reach: 289
Arm Pad Drop: 37
Frame Stack: 611
Frame Reach: 359
Oleg,
I agree, the Pad X (Pad Reach) numbers don’t make sense. Even the Pad Y is suspicious: they’ve got you at 703. If I massage your saddle height and pad drop it would think Pad Y would be more like 645ish - and if all you gave me was a few choice bio markers I’d put your Pad Y at 630ish and Pad X at 430 (to rear of pad where QR measures it).
I’m going with Pad Y of 635 and Pad X of 435 and I’m going to prescribe this with room to move. Don’t freak when I give you the size. QR sizing is both magically logical and startling at first. You should be on a 52cm bike, with a 90mm stem set up in the -17deg position with a 10mm spacer under that stem and 10mm of arm pad pedestal. The pads should be off set -55mm or -47mm resulting in either a Pad X of 430 or 438 respectively (that’s just one screw hole fore-aft in the arm cup). There’s lots of room to move here both in the reach of your cockpit (there’s a 70mm stem and a 110 stem plus lots of fore-aft in the armpads). And there’s up and down with up to 30mm under stem, 15mm pedestal and flipping the stem to a +17 position.
Ian
Just a bump here because there’s a Black Friday sale going on where you can save up to $2050 here https://quintanarootri.com/pages/triathlon-bikes?utm_source=pardot&utm_campaign=qr-black-friday-2019
Ian
.
Thanks for the reminder! Ordering my wife’s bike next weekend (early Christmas surprise).
Thanks for the reminder! Ordering my wife’s bike next weekend (early Christmas surprise).
PERFECT!!!
Ian,
Looking to make my first tri bike purchase. I’ve never been fit, I’m on a spec allez road bike.
Height (5’5â€)
Inseam 77 cm +/-
Saddle height 665 mm
I’m looking at the PR6 and PR5 I’m assuming 50. Thoughts from the little bit I could give you. Thanks in advance.