Fouriers singlespeed sprocket kit for mounting on a Shimano HG-type wheel hub, to convert a bike to single speed, for dirt, BMX, or urban use. I have them in 21T, 22T, and 23T sizes. Let me know via chat which size you would like me to send with your order; the price is for 1 unit, or we can discuss a price for ordering two or all three. You can use your Shimano-type cassette wheel and, by mounting this kit, convert it to a single chainring and sprocket setup. It comes with the spacer kit to adjust the chain line and the lockring, so you can use an 8-9-10 speed cassette wheel or a specific sin...