1 Pair Ceramic Bearing Rear Pulley Wheel Bike Roller (11T, Black)

Adopting aluminum alloy and ceramic material, this product is very to use. Can be applied for most mountain bike. Supporting for various speed shifting. Features: Adopting aluminum alloy and ceramic material, this product is very to use. Can be applied for most mountain bike. Supporting for various speed shifting. Suitable for use 4 Celsius 5 Celsius 6 mm wheel screws. Offers you a better cycling experience. Specifications: Item: Bike Roller Material: Aluminum Alloy + Ceramic Colour: Black, Golden (Optional) Diameter: 4 cm Celsius 1.6 inch (11 T), 5 cm Celsius 2.0 inch (13 T) Weight: 21-23 g Package Included: 2 * Bike Roller  2 * Installation Hole Adapter Tubes  (Other things on the pictures are not included)