ZTTO Aluminum Alloy Post to Flat Mount Disc Brake Adapter for Road and Mountain Bikes - 180mm Enhanced Braking Power: This adapter allows upgrade to larger disc rotors (160mm or 180mm), increasing braking surface area. Larger discs provide greater braking force and improved responsiveness, ensuring a safer and more reliable ride, especially in challenging terrains or during high-speed descents Versatile Brake Adapter for Multiple Bikes: Specifically designed to fit road bike clamp hole spacing of 34mm and mountain bike clamp hole spacing of 74mm, offering precise compatibility with various bike types Durable Aluminum Alloy Construction: Made from high-strength aluminum alloy, this adapter is lightweight and durable, providing long-term resistance to wear and tear. The material offers an ideal balance of strength and practicality for demanding riding conditions Front and Rear Wheel Compatibility: Designed for use on both front and rear wheels, this adapter provides flexibility for riders seeking to optimize their braking system across different bike setups Important Note: Road bike and mountain bike disc brake mounting standards differ significantly; therefore, the adapter is not interchangeable between the two Package included: 1 x Disc Brake Adapter 2 x Long Screw 2 x Short Screw