Features:
Anodized CNC machined construction.
Anti rust/corrosion resistant anodized.
Ceramic bearings.
Fits for 4/5/6mm roller screw axis and most of rear derailleur on the market,support 7/8/9/10 speed.
Specification:
Color: Black / Silver / Blue / Red / Golden (Optional)
Size: 11T / 13T (Optional)
Diameter: 41mm / 49 mm
Material: 7075 aluminum alloy + Ceramic bearings
Package weight: 30 g / 1.1 oz
Package List:
2* Wheel
2* 4mm Installation Adapter
2* 5mm Installation Adapter