Bicycles Asked by Angelo Simoes on October 12, 2020
My bike has 12 gears on the rear wheel. When I put the last gear (12) it starts constantly changing from 12 to 11 gear without me doing anything. For example, I put the last gear and it works; right away it changes to 11 gear for a very short time; then back to the last gear and so on. All the other gears work fine. I don’t known what’s possibly wrong. Sorry for my English.
Thank you!
First, it's not clear which gear you mean by "12th". Is it the largest or smallest one?
It sounds like your rear derailleur is not properly adjusted. As 11 of your 12 gears apparently work fine, it's most likely a problem with the limit screw for derailleur. It's probably not allowing the derailleur to travel far enough.
Park Tool has quite a few videos covering how to perform most bicycle-related maintenance.
In this case, Rear Derailleur Adjustment is the appropriate video.
Answered by Andrew Henle on October 12, 2020
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