Join Date: Oct 2007
Location: West Yorkshire, United Kingdom
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The Shimano versions are R505, for use with the previous generations of STI's, and R515/CX75 for use with the current (4600,5700,6700,7900) STI's
MTB discs won't work with road STI's due to the differences in cable pull, this applies to the the calipers, the rotors are the same for road, MTB, cable or hydraulic, just get the right size/adaptor for your needs. Wheels (hubs) come in 2 versions, 6 bolt, the most common, and centerlock (originally a Shimano only design, now being used my more brands), both work fine, but the rotors fittings to the hub are incompatible with each other.