I wanted to change my 53/39 crankset to a compact. I see cranks at 172.5 mm, 175 mm and others. Honestly, I don't know what length is on my bike (I know, measure it, foo!).
What consideration come into play when deciding crank length? I'm a ~100 mi/wk, average Joe biker with a 19# Scattante Race with Ultegra components and a FSA double crankset. I'm about 6' tall on a 58 cm frame.
So, what length cranks? Thanks all!