| If you are happy with the current gearing then keep as is. If you'd like to experiment with different gearing get a quick change rear carrier.
I'd look at the STM quick change sprocket carrier too. I know that this item has the locking lugs to stop the potential moving and damaging other parts. Depending on how old the bike is you'll probably have to replace the cush drives as well (read £50). The chain size you require is known as '520'. The 99x series runs 525 chain. This denotes the thickness of the chain. Length is dependent on the sprockets you are running.
If you do fit larger sprockets (or smaller) then you might have to cut the chain to size or you might have to do this anyway. You also have to make sure the eccentric hub on the rear wheel is set right too as well as the chain tension.
Good on ya for tackling this. I wouldn't (because I'm crap at that sort of thing).
I'm running STM quick change sprocket carrier with STM sprockets and DID ERV gold chain. |