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What appen if I change the number of the jockey wheels in a rear derailleur?
If you use either more or fewer than two, it will stop working.
If you have a 12T wheel when you should have had an 11T, use it in the lower position. It won't affect the shifting, but it will slightly reduce parasitic losses.
gbj_tester
What appen if I change the number of the teeths of the jockey wheels in a rear derailleur? I mistakenly bought a 11t and a 12t instead of 2 11t