Spin all the stuff like the guys suggested. But in the end it may be as simple as your tires got low in pressure. Do you pump them up every week or so? Have you got a guage on your pump to check what the pressure is or "that feels about right" which it never is. For lower rolling resistance on the street you want to run up within 5 psi of the top end of the rated pressure printed into the sidewalls of the tires.

If there isn't a problem with any wheel bearing and the cranks turn fine then it's either the tire pressure or just you having a few bad days.