![]() ![]() Replace derailleur when this play becomes significant. Do the same test on an old model to compare. Grab the cage at the lower pulley of a new derailleur while mounted to a bike and wiggle it side to side. As the derailleur wears, it will develop play at all pivot points. ![]() There are also after- market top pivot “break- away” bolts, which may be installed in place of the original mounting bolt. Additionally, some models allow for the changes to the pulley cage tension spring. This often improves performance by removing dirt from pivots. Curious about the media launch? Full Range of Cassettes at Chain Reaction Cycles. The DURA-ACE R9100 series is launched at a big press event in Caen, France. This article will discuss the overhaul of rear derailleurs and pulleys. 1921: Shozaburo Shimano establishes Shimano Iron Works and begins production of the original Shimano freewheel.
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