The Reverse Components Disc Brake Adapter is compatible with IS frame mounts and Post Mount calipers. Available in a variety of colors and sizes to fit your rotor, now you can completely colorize your bike or simply add a subtle touch of customization. Features: Fits Post Mount calipers and IS frame mounts Available in a variety of colors and sizes to fit your rotor Made from light but strong aluminum Specifications: Rotor Size:180mm Rear Mount Type: IS Caliper Type: Post Mount Brand Compatibility: Shimano Weight: 19g Color: Green