TYPE: Prevent the chain from falling behind the flywheel and reduce the sediment on the flywheel. SIZE: Outer diameter 138mm/5.43in, inner diameter
LUORNG 2PCS Freewheel Spoke Protector, Diameter 138mm Bicycle Flywheel Guard Bike Wheel Spoke Protector Cover Part for Mountain Bike, Road Bike : Sports & Outdoors
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