MEIJUN 12T Aluminum Alloy Bike Pulley Wheel Guide Wheel Mountain Bike EC.

Feature: \n 1. Made of high\u2011quality aluminum alloy material, it is durable and has long service life.\n2. 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.\n3. The ceramic material reduces the resistance, improves the riding efficiency, and makes the rotation stronger.\n4. It has a colorful appearance, stable performance, high reliability and exquisite workmanship.\n5. Suitable for most rear derailleur and supports 7/8/9/10 speed. Fits for almost all 12T mountain bikes and suitable for the use of 4/5/6mm guide wheel screws. \n\nSpecification: \n\nItem Type: Aluminum Alloy Bicycle Rear Pulley\nMaterial: Al7075 Aluminum Alloy + Ceramic Bearing\nProduct Color: Multicolors\nMounting Size: 4/5/6mm axis\nProduct Weight: Approx. 15g / 0.5oz\nFeatures: Suitable for most rear derailleur, support 7/8/9/10 speed. One thick gear and one thin gear are :