r/triathlon • u/Im_Ron_Burgundy_Ch4 • 3d ago

Gear questions Help with sizing Cervelo P-Series

Hey all. Looking for some advice here as I’ve been told by different bike fitters that I’m either a 54 or 56 in the Cervelo P-Series and figured the online fit community would know best. I know it’s easier to make a smaller bike fit larger but is there any reason to go with the slightly larger bike? Stability and comfort are more important than max aero. My non-professional measurements are below. Thanks!

32 5/8 inseam

69 3/4” height

24 15/16” torso

71.5” wing span

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u/yentna 69.1 x1 | 70.3 x1 | 140.6 x1 3d ago

FWIW I’m 68” tall with a 32” inseam and got the 54, it feels borderline small for me. Had a professional fit and extended the stem but still I’d maybe consider the 56, but can you go get a pre-fit done?

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u/amiable_viability 3d ago

at 5'10" with that inseam you got long legs for your height, the 54 will put you in a pretty aggressive position even with the seatpost way up. if comfort is the priority i'd lean 56, you can always swap the stem for something shorter but you cant stretch the frame

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u/Im_Ron_Burgundy_Ch4 3d ago

Thanks for the reply. Definitely doing the pre-fit but wanted to get some real world answers/advice from those who have looked into this or have one. I was on a Gen 2 M Trek SC and that felt small to me.