Bicycle Chain Guide Tensioner Crankset Modified Mountain Bike Speed Adjuster Accessory

Feature: 1. 8‑hole spring gear design, the spring is inserted into different holes to obtain different elastic forces. 2. The spring adopts a 2mm 0.08in thick wire diameter, and the built‑in structure makes the appearance more beautiful. 3. The shaft adopts 10mm 0.4in aluminum alloy shaft screws to prevent fracture and deformation. 4. The spring hole position of the chain tensioner can be adjusted by removing the shaft center, and the elastic force of the chain tensioner can be adjusted. 5. The length of the gear mounting screw is 17mm 0.7in, which more effectively solves the situation that the screw cannot be installed because the screw is too short and the gear is falling off because the screw is too short and too few threads. 6. 3mm 0.1i