I,m looking at a new Campy Veloce chain set for a new build project which comes in options of 170, 172.5 and 175mm. When I,ve bought complete bikes in the past, crank length has never been an option. I'm 6'2 and ride 58cm frames so is it logical I choose the larger 175mm option. I can't believe you would appreciate a difference of 2.5mm radius difference. Any of you guys offer some advise would be appreciated.