1. Features
Rapidly resolves chain slack to prevent drivetrain failure: During cycling, chains gradually stretch due to metal fatigue, increasing the clearance between the chain and chainrings/cassette sprockets. This can cause sudden chain slippage and abnormal noises when pedalling. The adjuster restores optimal tension through fine-tuning without chain removal, ideal for mid-ride maintenance during long journeys to prevent interruptions caused by slack chains.
Ensures riding safety and prevents sudden failures: Chain slack or misalignment is a primary cause of unexpected chain drops, particularly during high-speed riding or complex terrain where such incidents may cause loss of balance. The adjuster stabilises chain tension, mitigating such hazards at source.

2. Specifications
Product model: Mountain bike chain adjuster adjustable clasp wheel locking button
Dimensions: Length 50mm/1.97in, hole diameter 10mm/0.39in, width 26mm/1.02in

3. Package contents
4pcs bicycle chain adjusters

4. Important notes
Should the chain exhibit significant rust or binding (e.g., chain stalling when rotating the chainring), clean and remove rust first (using chain cleaner + brush). Do not force adjustment with the adjuster directly, as this may accelerate component wear.