Depends what hub you use. Velosolos spacers are pretty much only good for loose ball hubs. Any kind of super light trials hub and you'd need a custom axle/spacers, not that it should be too difficult to get something made. My dad is making me something up for a sealed disc hub at the moment. Unfortunately due to budget constraints it's a bloody heavy one :(
Depends what hub you use. Velosolos spacers are pretty much only good for loose ball hubs. Any kind of super light trials hub and you'd need a custom axle/spacers, not that it should be too difficult to get something made. My dad is making me something up for a sealed disc hub at the moment. Unfortunately due to budget constraints it's a bloody heavy one :(