Four Checks Before You Pull Back Into Traffic
Check the tire, the wheel, the stance of the car and the ground underneath it, in that order. All four take under two minutes and none of them need tools.
Get off the road first. On a residential street that means the curb. On Highland Drive or 700 East it means the first parking lot you can reach. On I-15 it means as far onto the right shoulder as the car will go, with the flashers on and everyone staying belted until help arrives.
Then work around the car.
- Run a hand along the tire sidewall on the side that took the hit. NHTSA lists cuts, cracks and bulges as physical damage that puts a tire out of service, and a bulge means the cords inside have already snapped.
- Look at the wheel rim itself, especially the inner lip. A flat spot, a crease, or a bright scrape of bare metal means the rim absorbed the impact instead of the tire.
- Step back and look at the car from the front and the side. A corner sitting lower than the other three points at a spring or a strut, not a tire.
- Check the pavement where the car came to rest. Fresh fluid means something tore open, and that is a phone call rather than a drive.
One more signal is worth watching. Every passenger car, light truck and van from model year 2008 onward carries tire pressure monitoring, so if that light comes on within the first mile after the impact, air is leaving the tire as you drive.
A Bulging Sidewall and a Bent Rim Are Two Different Failures
A bulging sidewall is a broken tire. A bent rim is usually a leaking one. Telling them apart decides whether the car can be driven to a shop or needs to go on a truck.
NHTSA counted 511 people killed in tire-related crashes in 2024, which is why a damaged sidewall is treated as a replacement rather than a repair. The bulge you can feel with a palm is the casing cords having given way under the impact, leaving air held back by rubber that was never meant to hold it alone. That tire can let go later, at speed, with no second warning.
A bent rim behaves differently. The wheel keeps enough of its shape to hold the tire, but the seal between the two goes soft, so pressure bleeds off over hours instead of seconds and a vibration creeps in that gets worse the faster you go. Plenty of drivers make it home on a bent rim and only find it when the tire is flat in the driveway the next morning.
Either way the spare becomes the next question, and it is the part nobody checks. NHTSA advises checking the pressure of all tires, including the spare, at least once a month when the tires are cold, and replacing any tire worn down to 2/32 of an inch. A spare that has been sitting soft under the trunk floor since the car was bought is not a plan. When it is not usable, a flat tire change in Sandy puts a road-ready wheel under the car where it sits.