I'm in the process of ordering my new bike. The bike is a 53CM frame, they said the crank is a 175mm crank arm which they're out of. They said they could do a 170mm or a 172.5mm crank arm. How important or difference is the 175mm oppose to the 172.5mm crank arm? I know the longer the arm, the more leverage for more torque just as in a longer stroke engine, and the shorter the arm the faster RPM. Can someone give me advise on this. I'm not using the bike for no Tour DeFrance, just some long recreation riding.
Thanks