Answer: This is certainly most often brought on by inadequately put in place derailleur limit screws and these will require altering. It will also be because of a bent derailleur hanger It truly is well worth checking the derailleurs and cassette are torqued correctly prior to modifying your gears. Kaden https://indexing-bike-gears35565.goabroadblog.com/31976400/indexing-bike-gears-for-dummies