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 stem comes in two different steerer clamp sizes. To ensure fit for most modern bikes, we have the standard 1-1/8in (28.6mm) steerer clamp available, as well as an oversized 1-1/4in (31.8mm) steerer tube clamp option. With the addition of the 1 1/4"(31.8mm) steerer tube clamp size, this means owners of brands such as Canyon and Giant can now use the Shockstop Stem. 

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).