Hey guys i'm running a 39/15 on a 172.5 campy crank, what gear ratio can i change to so i can go faster. if i change to a 49/18, would i be able to go faster, skid and would it be easier to pedal? Would a 49 it on my crank? What happens if you have longer chain inches? i'm having a little trouble finding the right gear ratio for myself, and understanding the chain inches and what it does. thank for any input.