Electric Bicycle Chain Roller Guide Tensioner Idler(Black)

1. Heavy duty chain idler guide wheel with upgraded torsion spring.
2. Spring loaded tensioner automatically adjusting tension towards chain elongation.
3. For Chain Tensioner Spring Loaded For 49cc 50cc 60cc 66cc 80cc Engine Motorized Bike
4. Smooth rotoring and longer life. Easy to install.
5. Material: A3 steel + iron + plastic