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What causes the wobbling of a motorcycle's small sprocket?

2 Answers

GiannaFitz

09/01/25 8:09am

Motorcycle small sprocket wobbling is caused by axial movement between the crankshaft and crankshaft bearing. A movement amplitude not exceeding 1 cm does not affect usage. Below is relevant information: Motorcycle: A motorcycle is a two- or three-wheeled vehicle powered by a gasoline engine, steered by handlebars that control the front wheel. It is lightweight, flexible, fast-moving, and widely used for patrol, passenger and cargo transportation, as well as a sports equipment. Broadly speaking, motorcycles are categorized into street bikes, road racing motorcycles, off-road motorcycles, cruisers, touring bikes, etc. Small Sprocket: The small sprocket on a motorcycle refers to the chain sprocket on the engine, mostly installed on the left side of the engine, specifically the front small sprocket in the drive chain system. The larger sprocket on the rear wheel is called the large sprocket.

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LaValeria

09/14/25 3:49am

I think the common causes of motorcycle rear sprocket wobbling should first consider loose mounting bolts. Many bikes, after being ridden for a long time, can develop wobbling if the bolts aren't tightened properly. I've seen quite a few cases like this during my own repairs. Secondly, chain wear or sprocket teeth becoming worn down can cause uneven power transmission, leading to increased wobbling. Bearing wear is also an issue; if the bearings are rusted or damaged, there will be unusual noises and swaying when the chain rotates. Additionally, frame deformation or improper installation can cause the rear sprocket to be misaligned, resulting in severe wobbling during acceleration. Ignoring this can lead to the chain running off track or even falling off, posing a serious riding hazard. I recommend checking the sprocket's mounting condition regularly, especially during routine maintenance, and having a mechanic tighten it properly—riding safety is crucial.

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