....to see if your tire lugs are properly torqued to ~85ftlbs. Use torque wrench if you can.
Check to see if one of the rear tire's bearing is going bad by:
- removing one of the rear tires
- spread the brake pads away from the disc (I use a screwdriver between the inner pad and the disk; you won't hurt the disk)
- rotate the hub and listen for binding or grinding.
Happy New Year!