The dmr single speed spacer kit is ideal if you are wanting to convert your dirt bike to a single speeder this kit has everything you need to do it quickly and easily so you can get on with riding this kit is made from anodised alloy which is strong and durable and allows you to change the single speed without fear of breaking in this pack you will get 3 anodised alloy spacer sandwiches a 16t cog which will replace your entire cassette and all it weighs is 87g which is great if your bike cou