4/5/6mm Rear Pulley Axle Guide Bolts Guide Wheel Rear Derailleur Pulley for Almost All 18T Mountain Bikes

4/5/6mm Rear Pulley Axle Guide Bolts Guide Wheel Rear Derailleur Pulley for Almost All 18T Mountain Bikes

• Positive and negative gear guide wheels alternate between positive and negative gears, which makes the speed change smoother and faster, and at the same time reduces the chance of chain drop.
• Fits for almost all 18T mountain bikes and suitable for the use of 4/5/6mm guide wheel screws.
• The ceramic material reduces the resistance, improves the riding efficiency, and makes the rotation stronger.
• Using high‑quality aluminum alloy material, it is and has long service life.
• It has a colorful appearance, stable performance, high reliability and exquisite workmanship.