The ShockStop will fit virtually all bikes with 31.8mm diameter handlebars, and we also have shims you can buy to fit 25.4mm and 26.0mm diameter handlebars. 

The ShockStop will fit bikes with standard 1 1/8" diameter steerer tubes but extra steerer tube spacers may be required if your current stem is taller than 40mm. 

If your bike has a quill stem, then you will need to buy an adapter ($10 - 15).