So I just won a Sram Dualdrive ll on ebay (under $200, woohoo!) for my D7. It says it has "Universal 6 bolt rotor Disc Brake Compatibility." So, my question is: Can I build it with a regular rim and use a rim brake, or is it disk brake only? I imagine the answer is yes, but you never know with these things. Sorry if it's a dumb question.