Hi Eric,

Can you please help with sizing on a P5d for my wife.. I'm a little confused as we were previously looking at a p5-6 (2nd hand) and using the size chart for that (with pad x measured to pad center) it looked like she was a 51 with low stem and perhaps 5 spacers.. Using the p5d calculator it looks like she might be a 48 - is the new p5 longer reach, or have I just mis-calculated?

Bike is predominantly for IM and she is a strong biker (front of pack AG). She packs light so storage isn't an issue (hence not considering PX series). Her current ride is a 2011 Cannondale slice, size51.

Current fit measurements (to back of pad).
Pad X: 420mm
Pad Y: 590mm
Pad Z: ~290mm to outsides (210 center to center) but she could come in a little.
saddle setback = 0, height (BB to top of saddle above clamp) = 695mm

To complicate things a little, the measurements above aren't her best fit - we put 10mm+ of spacers under the stem as she was off the TT for awhile and had some unrelated hamstring tightness that has since resolved. Her pad Y will come down over the next few months ~15mm+ ie <575mm. She was previously comfortable with the bike fit at that stack (and guidance from the fitter to lowering further over time). It would be a shame to buy a bike based on current fit and find it she becomes fit constrained as she re-adapts.. I have uploaded a couple of photos in case that helps, I do wonder whether she looks like she needs to go a tiny bit longer. Current fit (higher stack) is on road and post bike fit is on trainer - only difference in the photos is spacers under the stem.

Thanks a lot for your sizing advice...
Much Appreciated,
Alex

I would like to know if there is any information on the swap for EX10. I have an athlete that wants to get the EX10 but they will not let her swap it out, want to charge over $500 and just sell her the parts.

Eric, another one for you please.

Looking for a P5D for my wife. Pretty sure she needs a 48, but second opinion appreciated. She's got long legs proportional to height and comfortable in a relatively aggressive position. All measurements to back of pads.

• Reach - 420mm
• Stack - 560mm
• Saddle height - 680mm

Any help appreciated.

eric,

im looking at either a P5Disc, PX bike, or a Shiv Disc. my coordinates...

im on a premier tactical, using their tilt kit. tilt is measured at 13 degrees on the pad per my iphone.

reach from BB to back of pad is 495
stack from BB to middle of pad is 626
BB to seat center is right at 750.

cervelos site has me in a 56 or 58 for a P5, and firmly in a L for the PX bike.

thanks in advance!

Hey Eric,

I am looking at getting my first triathlon bike and looking at the Cervelo P2 or P3. I got a fit test for a road bike (56 cm) with aero bars and the coordinates are below:

HX: 525
HY: 650
SX: 220
SY: 668
Stack: 600
Reach: 420
Crank Length: 172.5
Saddle Height: 763

I know it isn't a true triathlon bike fit test, but as a newbie I was just looking to make the best out of my setup. Any help for my next set up with a Cervelo would be greatly appreciate. Thanks for the time!

hi Damon,

With a Pad Stack of 626 and a Pad Reach of 495, you'd fit either a 56cm or 58cm P5d. Ordinarily I'd say get the bigger one, ie. the one that is longest but still low enough, but if you know for sure you absolutely *won't* get any longer you could use the 56cm.

That said, you on the 56cm P5d would be maxed out for reach, and I've never met anyone that couldn't use at least a little more reach, so in that case I'd recommend the 58cm P5d.

You'd have to post a picture for us to be sure.

Make sense?

Eric

Eric,
Thanks for getting back to me and sorry for delay, been busy with a new job.

I am 5'11" and my inseam is 32-33 in/81-83 cm.

Yes you are correct I can only move my seat so far forward since it is a road bike. I am on a 172.5 mm crank because that is what the bike came with and I didn't want to switch out the crank length if I was going to be buying a new bike. I did try 165 mm and seemed to like that as well. The pad stack and reach were what were given to me on her sheet that she sent me. Again though that was as good as the fit would get me with my current road bike/clip on aero bars set up would allow me. I could probably get lower and not so upright with no problem.

I attached two pics from my current set up for you to look at.

Hi Eric.
Looking around at a new bike
Shortlisted is the p5d

Pad X 483 (528 for centre pad, so - 45mm to the back of the pad, the reference I have here is 90mm long pad)
Pad Y 622mm
Pad Z 180mm (c-c)

Hi Eric,

I'm interested in the P5d but i'm a little unsure of the size. here are my numbers:

stack: 665mm
reach 470mm
pad Z: 160mm (center-to-center)
saddle: 770mm
bar tilt = 10 degree

I'm currently on a QR PRsix 54. Using the cervelo fit calculator it puts me in the far corner of a 56. Would there be any concern with running the monoriser that high? Or would i be better off looking at a 58? I just feel like the 58 is a "big" bike, and would be a little concerned with the seat tube length and stand over height. I'm going to head out today and try to see them in person to get a better idea.

And if i keep the flat bars that come on it (no tilt), would that change my coordinates at all?


Thanks!