Amazon.com : BIKEHAND Bike Bicycle Chain Wear Indicator Tool Chain Checker – Compatible with Shimano Sram Campagnolo KMC & Other Brands- 7 to 12 Speed Chains – Maintenance for Road, Mountain &
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Bay City Cycles - When did you last check your chain stretch? When bicycle chains wear, the links slowly stretch, causing your chain to lengthen slightly. When your chain stretches, it's best