You are probably joking, but i just found a P3 aluminum in 54 and 26 inch wheels, still new in the box, right around the first bike that cervelo made in early 2000.
wasn’t joking at all. understandable that shops don’t want the extra SKUs and companies don’t want to spend the extra money opening moulds, but it doesn’t necessarily make for the best bikes (i still can’t believe how many people ride 44cm-48cm bikes with 700c wheels… what a travesty!).
on a related note, didn’t the p3 come in odd sizes above 51? 53, 55, etc.?
and actually, it’s possible that that was the case with the p2 series when they were still running 650c above the 48cm frames.