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Join Date: Aug 2010
Location: Washington
Posts: 472
Bikes: Serotta Davis Phinney, 1992 Serotta T Max,1984 Specialized Allez, Olmo, 1974 Strawberry,Redline bmx, ect.,
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The geometry is going to change as well as the braking power between disc and rim brakes will be different. Unless you already have the parts it would be best to get a new bike and swap your XT parts to that bike, you need a Surly fork or similar $120, brake $60- $100,wheel $100. Specialized has a Hardrock disc for about $450 new and then swap your better parts to that bike and then sell or keep the old bike when rebuilt with the new parts. Also before you invest make sure the rest of the bike is in perfect order so this doesn't cost you several 100 more to complete the project. I hated having one disc and one cantilever brake. Good luck