The Fixxer replaces the freehub body of Shimano brand hubs and is ISO threaded to accept a fixed gear cog and lockring, allowing you to convert a geared wheel to a true fixed gear.
A popular conversion for track racers, springtime trainers, fixed-gear commuters and messengers, the Fixxer includes all parts necessary for installation, including axle, bearing, cones, spacers, and axle nuts. Most converted hubs can be spaced 120, 126, 130 or 135mm. You’ll still need to get a lockring and cog and of course a frame with appropriate dropouts.
The Fixxer works with many Shimano brand hubs. Note that this doesn’t simply mean hubs that accept Shimano cassettes, but rather actual Shimano brand hubs. But not all Shimano hubs. There are some Shimano hubs we know will not work. They are: all Silent Clutch, Dura Ace made before 1997 and after 2003, XTR M970/975, XTM770/775, Saint, and DXR-MX70. Additionally, Shimano has in recent years begun to use proprietary axles instead of their old standard 10x1mm standard axles. Since Shimano is constantly changing and updating designs, we simply do not always know what hubs will or will not work with the Fixxer. What we can tell you is that if it is a Shimano hub using a 10x1mm standard axle, the Fixxer will probably work.