12XU,

Depends on your hub. A Dura Ace hub accomplishes the 10 mm spacing reduction by taking 2.5 mm each out of each cone and each locknut. That means all the pieces are custom to a 110 hub. You can get some Shimano road cones for, I believe, 7400 hubs and use them -- they are thinner, and then get generic thin locknuts from www.biketoolsetc.com or someplace like that. All the world except Campy and the pure Campy lookalikes (Gipiemme, Zeus, etc.) use 10x1 mm rear axle threading, so everything is interchangeable (at least as far as threading is concerned).

Sure you don't want to spread the frame to 120 mm and keep the narrow slots with the 110 axle? It's a compromise solution that's a lot less effort. The hassle with 110 is that you are unlikely to run into another hub to fit the frame (other than through Brent's largesse -- see above). I personally tend to convert frames to 120 mm: any steel frame can be spread properly to the right width, and then use a drawfile to do a really nice, quick, professional job of widening the slots to fit a regular 10 mm axle. Then you never have to look back. Keirin frame manufacturers have for the most part dropped 110 -- why shouldn't you?