Brake adaptor drops the brakes by 3/4" to run ISO 406 wheels ( Pro size ) on frames which is build for ISO 451 wheels ( expert 1 3/8 ) VPS BRAKE ADAPTERS INSTALLATION INSTRUCTIONS 1. Use a 9mm open end wrench to unscrew the brakepost out of the frame. 2. Do the same to the other side. Be sure to grease the threads on the bolt and brakepost before you install. 3. Place the VPS Adapters over the brakepost mount, putting the pin in the center of the three small spring tension holes. A very small percentage of frames are machined with a 10mm x 1.0 pitch thread for the brake post. If you experience difficulty threading the VPS mounting bolt into your frame or your brake post does not thread into the VPS mount this is the cause. Contact Bombshell for additional help on this. 4. Place the 8mm bolt in the original brakepost mount. Use an 8mm socket on end wrench to tighten the bolt. 5. After the VPS Adapter is tight, install the brakepost into the upper brakepost mount. 6. Tighten the brakepost with an 9mm open end wrench. 7. Grease the brakepost before installing the brakes, so that your brakes will work smoothly.