It is only compatible with the HG freehub mounting standard

which you can purchase separately

allowing you to tune both the negative and positive air volume to perfectly match your bike

Featuring much of the same technology as the XT but at a more affordable price

Smith Boomtown Sunglasses - One Size Fits Most - Matte Wild Child - ChromaPop Violet Mirror Lens Dangerous Goods It is only compatible withBeach, boat, town, or trail, the Smith Boomtown sunglasses let you roll between routine and adventure with the coverage you need and style that never looks out of place. A slightly wrapped frame plus a full coverage ChromaPop shield lens are all about pursuing your thrill. A comfortable, all day fit and subtle shape make the Boomtown your quiver of one sunglasses for living the good life. Product Details Vision ChromaPop polarized lenses cut glare and