8 Speed Freewheel sprocket 13-28 tooth, Sun Race Brand, Standard right hand threads. Shimano Hyper glide compatible. Our custom hubs use "thread on" freewheels, not cassettes. See the difference in "Freewheels and Cassettes". Most bikes that cost over $400.00 will use a "cassette". If your wheel has a cassette it's better and cheaper to buy a New Double wall Alum rim and order the 8 speed freewheel. This way you can keep your old wheel or sell it to cover the cost of the new wheel. Our CNC machined Four bearing hub made in the USA is probably much better then the hub you know have. If you have a 9 speed cassette and you want to use our kit, order the 8 speed freewheel, you loose 3 gears (big deal) most people only use about 5 any way.