Surly's Single - Speed Kit comes with spacers and a lockring. Now, you can easily use single - speed cassette cogs on the freehub body of your multi - speed Shimano cassette - compatible hub. With a great selection of anodized aluminum spacers, you can achieve a perfect chainline to go well with your road, track, or mountain crankset. Our large - diameter stainless steel cassette lockring holds all parts firmly together. It perfectly matches the outside diameter of the spacers and the machined shoulder of single - speed cassette cogs (cogs not included). The lockring can be installed and removed using a common Shimano cassette lockring tool.

Using this Surly single - speed kit is easy. First, make sure your hub is multi - speed Shimano cassette - compatible. Then, choose the right anodized aluminum spacers to get the perfect chainline for your crankset. After placing the spacers, put on the single - speed cassette cogs (not included). Finally, use a common Shimano cassette lockring tool to install the large - diameter stainless steel lockring. When removing or installing the lockring, be careful not to over - tighten. For maintenance, regularly check the tightness of the lockring and the condition of the spacers. Keep them clean and dry to prevent rust and damage.