I have a racing partner who is trying to get me to buy my new bike two sizes smaller than what I'd normally ride (XS rather than M).
He says that b/c the head tube is shorter that I can get a more aggressive aero position and that I can run the saddle higher to compensate for the tighter geometry. Thus, theoretically I can fit the XS (I'm 5'10'') that has a 52.5 virtual top tube.
Apparently the European racers have a habit of choosing their bikes as small as possible, but I'm concerned about the geometry and also about the fact that I'd be on a bike with 170mm crank arms rather than my usual 172.5mm.
Should I expect differences in handling (faster b/c the shorter wheelbase, but anything else?)?
What about the crank length? Will that affect my knees or feet and cause discomfort?
Thank you for your input.