18T Rear Derailleur Pulley Lightweight Durable Guide Wheel For Bikes Premium

Feature: \n 1. It can be applied to most mountain bikes, bicycles, road bikes, folding bikes, etc.\n2. High quality material, adopting aluminum alloy and ceramic material, lightweight and durable.\n3. Fine workmanship, make your bike more stylish and cool, easy to install.\n4. Supports various speed changes to provide you with a better riding experience.\n5. Our rear guide wheel is sensitive and safe, let your cycling exprience more safety and relax. \n\nSpecification: \n\nItem Type: Rear Guide Roller\nMaterial: Aluminum Alloy + Ceramic\nColor: As shown in the picture\nSpecification: 18T\nLength Size: Approx.72mm / 2.83in\nInstallation Size: Approx.6mm / 0.24in axes\nSmall Ring Size: Approx.4mm / 0.16in\nLarge Ring Size: Approx.5mm / 0.20in\nApplication: Rear derailleur 6MM axes guide wheel\n\nPackage List: \n1 x Rear Guide Roller\n2 x Accessories \n\nNote: \n 1. Please allow 1\u20112mm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same: