what i do is duplicate my mesh and snap the vertexes together, then duplicate it till i get a long flat tire, then shrinkwrap the selection to a cylinder that would define the wheel. but i hate the process to duplicate and make the lower bottom part match the upper part, so that i can merge vertexes easy. i go crazyyyyy on stuff like that haha ..You should be able to do a Duplicate Special and rotate it around the inner axis. This will duplicate this patch into a full circle. You can also tell duplicate to attach the new tiles to this one which would create a pretty smooth surface for this tire. Does that make sense?