Each piece has 1-2pcs small flywheel for loss of teeth, in order to speed the process, the chain is easier off the chain to make the transmission more smoothly.
Suitable for cassette variable speed flywheel.
Freewheel Speed: 8 /9/10/11 speeds
Size: 11T/12T/13T(and cover)
Please allow 1-3cm differs due to manual measurement.
Due to the different display and different light, the picture may not show the actual color of the item. Thanks for your understanding.