The stopping power you have been waiting for on your pit bike wheels! These brakes are amazing and wish we would have had them for you much sooner!  These will work as a direct bolt on with our swingarm and forks.  Please note these will not work on stock forks!  The front is a 44mm brake mount pattern and the rear is a 51mm.  With adapters these will fit on razor wheels and we are currently working on providing those for you also. There is a vendor that sells the adapters currently if you're using these on razor wheels with our forks.  These are pre-bled and ready to bolt on. We also provide a custom aluminum bracket in place of the stock bracket so they bolt right on. These work with 190mm pit bike rotors. 180 zoom style rotors will not work, only 190mm pit bike rotors.