OVERSIZED PULLEY WHEEL SYSTEM. The Bigger Pulley to upgrade the riding performance! Let chain angle getting smaller, improve the shifting smoothly. Color:Black /Red /Gold / Silver/ Blue / Purple available.
OVERSIZED PULLEY WHEEL SYSTEM. The Bigger Pulley to upgrade the riding performance! Resistance is smaller, gain the power more than usual. Teeth:16T Oversized. Color:Black /Red /Gold available.