grellboy
Über Member
Looking to get new wheels so was going to get a new cassette at same time. Have 8 speed Shimano on my road bike currently. Anyway, just been on Chain Reaction and they have five different ratio cassettes available!!! These range from 12 - 21 to 13 - 26. I have a vague idea these numbers refer to teeth but what is the actual difference out on the road?