Rear Derailleur Check Out
By Bicycle Trails Council of Marin.
Slightly bent tabs can be straightened by re-installing the derailleur and inserting a long hex key into the derailleur securing bolt and carefully applying force until the tab bends and chain alignment is correct. Aluminum framed bikes with bent hangers should be left to experts as the risk of tab breakage is a real possibility. The introduction of narrow chains, Hyperglide, seven, eight and now nine speed cog sets make the importance of accurate derailleur alignment crucial to smooth shifting.
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