Enhance your mountain biking performance with these high-quality Bike Guide Rollers, expertly crafted from durable aluminum alloy and ceramic materials for long-lasting use and superior strength. Designed to fit most mountain bikes, these guide rollers support various speed shifting systems, ensuring smooth and precise gear transitions for an improved cycling experience. Compatible with 4mm, 5mm, and 6mm guide wheel screws, these versatile rollers provide easy installation and reliable operation. Key Features: · Premium Aluminum Alloy and Ceramic Construction: Combines lightweight durability with wear resistance for extended service life under demanding conditions. · Universal Compatibility: Suitable for most mountain bikes and compatible with multiple speed shifting setups to meet diverse cycling needs. · Multiple Size Options: Available in 4 cm (11 teeth) and 5 cm (13 teeth) diameters, allowing you to choose the perfect fit for your bike. · Versatile Screw Compatibility: Supports 4mm, 5mm, and 6mm guide wheel screws for flexible installation options. · Enhanced Cycling Performance: Designed to deliver smooth and efficient shifting, providing a better overall riding experience. · Color Variants: Offered in sleek black and golden finishes to match your bike’s style. Specifications: · Item: Bike Guide Roller · Material: Aluminum Alloy + Ceramic · Color: Black, Golden (Optional) · Diameter: 4 cm / 1.6 inch (11T), 5 cm / 2.0 inch (13T) · Weight: 21-23 g Package Includes: · 2 x Bike Guide Rollers · 2 x Installation Hole Adapter Tubes Upgrade your mountain bike with these durable and efficient Bike Guide Rollers, engineered to provide reliable shifting performance and enhance your cycling experience on every ride.