Can anybody help I need to buy a new shimano sora 8 speed derailier but I don't know which I have on the bike ive got a 12 28 on the back so I don't know which one to get short med long.
It WILL take bigger. Managed a 32 on my sons bike (MTB cassette) coupled with a 39 up front, got him up Ventoux (just don’t do the big / big combination).
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