For Surron Ultra Bee 2023 Rear Wheel Chain Adjuster Axle Tensioner Block Red AN
For Sur Ron Ultra Bee 2023+. For Sur Ron Ultra Bee， Axle Block Chain Adjuster Bolts. 2 X Axle Block Chain Adjuster Bolts。. Function: Turn the adjusting bolt. Move the axle block forward or backward to adjust the sprocket tension.