6’3"
58"
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6’3"
58"
That’s a really big bike. I didn’t know they made bikes that big.
I’m 6’, 33-34" inseam, and ride a 56cm P2SL (lots of drop to the bars).
5’9. 51CM p2, 69.7cm seat height. 71mm Seat Height, 81 degree STA FIST approved.
6’3 58cm
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I’m 5’ 9.5" & ride a size 54. Seatpost is in the rearward position with saddle 2.5cm behind the BB, 90mm -17deg stem with no spacers (8mm headset cap only).
Funny how these things evolve over time…now in the forward position with saddle 1.5cm in front of the BB, 115mm -17deg stem with no spacers, 76cm saddle height and 17cm drop…quite a difference to the position mentioned above 18 months ago 
I am 6’ 1" on a P3 size 58, 90mm stem, no spacers, saddle in forward position and almost all the way forward. 12(ish) cm of drop (? from memory). Got the bike used. 33" inseam. I “could” also go with a 56, but would need 1 cm of spacer and a 100-110mm stem to keep things even. And use the 25mm risers on the Vision armrests; could use the 12mm but these “feel” better and I can keep my elbows and hands closer together for some reason. I also cut the 270mm ski-bend extensions down just a bit so that my hands naturally land on the shifters. Average torso.
EDIT: After thinking on this for a bit, if I were to get a new bike it would be a 56 P2. That would match exactly how I’d want my current P3 to be.
5’9", 32 inch inseam, 54 P2SL and very comfortable.
5’ 8.5" riding a 51cm, grey, P2SL.
Can’t complain about it, except that I haven’t been able to ride it lately.
Just picked up a P2K and was trying to decide between the 53 and 55. I ended up getting the 55 and have it set up on the trainer. 20mm of spacers on a 90mm long syntace stem with the post in the forward position and saddle height right at 710mm. It fits like a dream and I feel that I can ride in the aero position for an hour on the trainer which was something that I could not do before on any bike I had set up. I think the drop is about 9-10cm currently.
I am 5’10" not very flexible and a 31.5’ inseam. I think I could have gone with a 53cm frame but the head tube was only 90mm tall and I think that would have been not enough for my back issues.
I’m 5’7" and ride a 51cm with 170 cranks, 100mm stem, no spacers. Fits fantastical.
YRMV, but I’m 5’9" and change with a 33" inseam. I’ve comfortably ridden a 54cm P2-SL with no spacers (120mm HT), but I couldn’t get as much drop as I would like. I now ride a 51cm P2 with no spacers (90mm HT). IMHO, it fits, and rides, quite nicely. Then again, I ride fairly steep (PD Tristryke about all the way forward on the rails). So, a 54cm may work for you, but I’d be reluctant to buy it without riding one first.
5’11, on a 54, no spacers, fits perfect
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I’m 5-7" and I ride a 53 or 54cm? P2K with 650 wheels. I find it a touch small and ride it with the seat in the forward position, and with a 120mm stem. If I set the seat back, I feel really tight in the hips and can’t breathe properly. (although I do have heart/lung breathing issues with heart and asthma meds every day)
I’m 6’2" with 34" inseam. I ride a 58cm frame, seatpost flipped forward, saddle a little forward of mid-point on the rails.
I’m in this dilemma too. I’m just a hair under 5’10, yet I only ride with a saddle height of 73.5cm as I have a small inseam for my height.
I see people who are 5’11 saying that a 54 fits perfect, and people who are 5’9 saying a 54 fits perfect…
Anyone have a pic of a 51 P2C set up with a saddle height of 73 or 74cm???
I tried a 54 recently, and didn’t need many spacers for the bars, but in order to not be reaching way out for the armrests, we needed to put like a 7 or 8cm stem on it, and that was with the saddle pushed pretty far forward. And if it matters, the standover height of the 54 being around 77.5cm, was basically just touching me when standing over the bike.
I’m thinking a 51cm would work better for me, even if it means I might need 2.5cm of spacers??
6’0", 56, professionally fit, feels great. Seatpost in aft position, saddle more or less centered.
Find a professional fitter before you buy your bike. It will be one of the best investments you can make.
That being said, I’m 5’7’’ and ride a P2-SL size 54, forward seat angle (79-80 degrees), 90mm stem, 20mm spacers (these are temporary, while I work on my flexibility).
I hope this helps.
6’2", 55 cm P2K. 100mm stem, 21.5 cm drop. Seat post in forward position but on the front of the rails. 1 cm in front of BB.
6’1", frame size 58cm. Saddle on the forward attachment to the seatpost but kind of mid/backside of the rails. My saddle height is 82cm (with Shimano pedals) - same as on my race bike.
Spring for a professional (FIST, etc) fitting. Use the $ you saved on buying it new to make it fit right.