Blimey - that's quite a jump between the 2 rings! Are you sure you haven't put on a compact chainset - 50/36 or 50/34?Changed 50/39 chainset for a 50/30 and replaced rear mechanism with long cage unit, along with new chain. With help of varying advice on internet (Utube) managed to adjust system all round and seems to work ok. Short try out but put to the test tomorrow.
Changed 50/39 chainset for a 50/30 and replaced rear mechanism with long cage unit, along with new chain. With help of varying advice on internet (Utube) managed to adjust system all round and seems to work ok. Short try out but put to the test tomorrow.