The Zombies mode in Call of Duty: Modern Warfare 3 has players completing specific challenges before progressing through the story. Some of the earliest challenges can be a bit random, such as having to repair a tire on a vehicle.
How to Repair a Tire in MW3 Zombies
Road Rage is the third mission of the Tier 1 Missions, and has two requirements to complete: run over 50 zombies with a vehicle and repair one vehicle tire. Drivable vehicles can be found around the environment and are marked on the overworld map.
Running over the zombies is the easy part, but repairing a damaged tire may not come naturally to fully complete the Road Rage challenge. The easy way is to shoot any of the tires on the playable vehicle, look at the damaged tire, and hold the button prompt to repair the tire back to new.
It is as simple as that. This can be done as many times as possible, so long as the car is not badly damaged enough to blow up. No resources or money are used in the process, and the repair can be done anywhere on the map.
There are still gas stations on the map that will refuel and heal your vehicle, but are not completely required to complete the full Road Rage challenge. These are marked on the map with a gas pump icon, the same as the DMZ mode from Call of Duty: Warzone. Hitting zombies with your vehicle will damage it, so it is best to find one of the various gas stations around the map if you want to continue the rampage.
For more Modern Warfare 3 coverage, please check out our guide on how to switch to third-person mode in MW3 Zombies.