Join Date: Jul 2005
Location: Wpg. Manitoba
Bikes: Mountain Cycle Rumble. Mostly xt and raceface built. Dirt Jumper 3. Avid BB7s.
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Well, if the disc is rubbing then it will impede the free spin. But that is a set up problem and the caliper needs to be re-adjusted, or the disc itself is bent if it's touching the pads intermitanlty . It shouldn't be hard to tell if the disc is rubbing or not.
If the disc isn't rubbing, then maybe the hub is put together to tightly and the bearings are binding. I had a new wheel before that was like that and didn't spin smoothly at all. I loosened the bearings a bit and it spun smooth as butter.
edit: oh,and since I didn't really answer your question. No, a disk equipped wheel should spin as freely as a v-brake equipped wheel.