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This year they've got three different singlespeed/disc mountain bikes and a singlespeed/disc cyclocross bike as well!
Using a disc brake means you can't use a flip-flop hub, so you'll be stuck with only a single gear option.
Also, as the chain wears and you move the wheel back in the axle slots, the relationship between the disc and the caliper will change, which is a Bad Thing.
If you combine a disc brake with an old-fashioned rear-opening fork end, as is currently fashionable, you have to undo the caliper just to fix a flat tire!
|Articles by Sheldon Brown and others|