I removed the rear wheel for flat repair and after re-installing it, noticed the wheel did not rotate freely. I torqued the axel nut to 72lbs. If I loosened it a bit, the wheel rotates as it should. I took off the wheel and checked to see if all the spacers were there (they were). I noticed a slight drag on the bearings on the sprocket side of the wheel. I reinstalled the wheel, and if I torque it to about 55-60lbs, no problem. At 72 pounds, stiff it is pretty stiff. Could I have damaged the bearings? What am I missing here, if anything? Any suggestions would be valued. Thanks!