Solid Gear Custom Bore

19mm traditional is our standard bore size. If you need a different size please select from the available options. If choosing "custom" you will need to specify the bore diameter in the order comments.                   Universal Spline Drive                   19mm Traditional Mount                   22mm Traditional Mount                   15/16" Traditional Mount                    Custom (Specify size in order comments) *Spline drive insert is not included. Follow link to purchase.*Profile Universal SD Adapter | Powers Bike Shop (powersbmx.com)