11/13T Bike Rear Derailleur Jockey Wheel Bearing Pulley 11T

Description:

Used on rear derailleur for chain transportation and speed changing.
Made from CNC 7075 aluminum alloy, super light and durable.
Jockey wheel is anti-rust and corrosion resistance for long time use.
Fit for 4/5/6mm roller screw.
Apply for most rear derailleurs.

Specification:

Material: 7075 aluminum alloy
Size: 11T - diameter about 41mm; 13T - diameter about 49mm

Package Includes:

1 x Bike Rear Derailleur Pulley
1 x Bushing
2 x Covers