55 th 130BCD Chainring
This size is hard to get . It makes a lot of sense to use a 55 X 12 instead of going to the 11 in sofar as chain drive efficiency. See Stanford university study on out tech page
This size is hard to get . It makes a lot of sense to use a 55 X 12 instead of going to the 11 in sofar as chain drive efficiency. See Stanford university study on out tech page
