Q: Rear wheel came off

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My rear wheel came off.

The most common cause of wheels falling of of vehicles is under or over-torquing the lug nuts. If the lug nuts are over-torqued, the studs they tighten down on will become stretched and therefore weaker. It is also possible that they could break. If the lug nuts are too loose, the wheel will wobble back and forth until something breaks allowing the wheel to come off of the vehicle. In the case of BMW, they have lug studs that tread in to holes in the hub assembly. This is the opposite setup of the average vehicle. I would first recommend having your vehicle inspected by a certified technician, such as one from YourMechanic to see what may have been broken in the process. After any broken parts are replaced be sure that the technician tightens your wheels and lug nuts to the correct specification.

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