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After a couple trips on my Tektro brakes, I've realized that upgrading my brakes is literally a life or death situation. After reading everything I can find on this forum and searching the net, I've decided to go with the Hayes Stroker Trails. How can I find out what size rotor my Dart 2 fork can handle? Also what size rear rotor should I get? (I'm 175lbs )
 

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203mm is max recommended rotor size for Dart 2 (at least for the '08 model, although I don't think it would have changed): http://www.sram.com/en/rockshox/crosscountry/dart/#
Remember that disc brakes put their force on the wheel hub, while the friction with the road is a force at the tire/rim. This generates a net twisting force between the hub and rim, so in general wheels need stronger spoke cross-lacing for discs than for rim brakes. If you're going to be applying severe braking forces, make sure you've got heavy-duty wheels.
 
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