its chain and sprocket mechanism
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Product reviews:
Rachel
2025-06-06iphone X
Bicycle Mechanisms Chain On Stock Photo bicycle chain mechanism
bicycle chain mechanism
Philip
2025-06-06iphone SE
Bicycle chain. Vector illustration of bicycle chain mechanism
bicycle chain mechanism
Merle
2025-06-09iphone Xs
New ten speed bicycle transmission bicycle chain mechanism
bicycle chain mechanism
Mark
2025-06-09iphone 7 Plus
Closeup of a bicycle gears mechanism bicycle chain mechanism