Freewheel cassettes cost from about £10 but plan to spend about £20 for a good one.
or £70 if you want one that is far better than all the others (Eno) and doesn't knock constantly and have slow pick up. If you ride a lot it is actually worth the £70.
or £70 if you want one that is far better than all the others (Eno) and doesn't knock constantly and have slow pick up. If you ride a lot it is actually worth the £70.