ITEM NAME:Mtb Mountain Road Bike Freewheel Bicycle Flywheel Cog Cassette Metal Thread B7K1 Mtb Mountain Road Bike Freewheel Bicycle Flywheel Cog Cassette Metal Thread B7K1 1. High efficiency drive train supports aggressive rides. 2. For smooth/stable movement and drive. 3. Light weight construction. 4. The 7-level flywheel is suitable for 21-speed bicycles Material: metal Color: gray Size: 115mm*115mm*35mm/4.52*4.52*1.37 inch Model: 7-level flywheel Net weight: 429 Package Contents: 1 x Bicycle Flywheel
