Features: Upgraded your bike's braking system with this durability aluminum V brake extension adapter, for seamlessly 406 to 451 wheel conversions and easyly installation. Consist of light weight yet aluminum alloys, this brake calipers adapter ensures precise equipment and reliability performances on various bicycles models. Essential for folding bike enthusiasts, mountain bikers, and road cyclists pursues enhances brake compatibility during wheel upgraded. Optimizes braking efficiency during commutes, competitive cycling event, or trail cycling requiring suited wheel configuration. Engineered with universal compatibility, this bicycles brake adapter,and tourings bikes without compromising frame clearance. Specifications: Color:Two Elections Dimension:49.2x16x17.6mm/1.93×0.62×0.69 Component:Aluminum alloys Package Includes: 1Set Bicycles Brake Calipers Extension note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.