The Wikid hub was designed for motorized bike use. It is a 36 hole SEALED BEARING REAR HUB, drilled to accept 11 gauge spokes , with lots of room left over if you want to drill it out further, for 10 gauge spokes . It accepts a 3 bolt hole engine sprocket , ( the same ones used on the hub adapters, 79.5 to 80 mm center to center bolt hole pattern ) as well as a 6 hole disc brake rotor mount , ( 44mm hole pattern ) and single speed freewheel. A disc rotor spacer and bolts are included . A 12mm thru axle is installed ( We install axles and bearings before shipping ) NOTE: some frame drop outs will need to filed out 2mm on the bottom of each drop out for the 12mm axles to fit....The Wikid hub also comes with a limited lifetime warranty. The warranty covers hub against factory defects or failure when used properly. ( Axles and bearings are not covered, but may be replaced by Gemini on a case by case basis ) All axle nuts and spacers are included. Hub also ships with (6) 5mm disc rotor bolts and (3) 8mm engine sprocket bolts. A 7mm thick disc rotor spacer is also included. Uses approximately 245mm spokes on a 26" rim . ( for reference only, your results may differ ) Please note, no sprockets, freewheels or disc brake rotors are included.