How to Plug a Leaky Tire

Got a flat tire? If a small puncture is the culprit, there's a good chance you can fix it yourself. Learn how to plug a tire and get back on the road.

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Modern vehicle tires are tough, standing up well to rough terrain and thousands of miles of driving. Trouble is, tires are not invincible. Every so often car tires spring leaks. Air can start leaking from anywhere on a tire, and the location of the leak determines whether or not you can fix it yourself. And if you can't fix it yourself, the location of the leak will also tell you if you need a professional repair or a new tire.

Whether or not your tire is tubed or tubeless affects things, too, because only tubeless tires can be repaired using the technique of plugging that we'll show you here. The good news is that modern vehicles always have tubeless tires, and this means that repairing with a rubber plug is often an option.

Plugging a tubeless tire is only a possibility when your puncture is in the tread area. If the air leak is where the sidewall of the tire meets the rim — this is called a "bead leak" — you'll need to visit a mechanic with a tire machine to dismount the tire from the rim and remount it with sealing liquid applied to the bead. If your sidewall has been punctured, you need a new tire, because damage there can lead to a blowout at highway speeds, even after repair.

Learn exactly how to plug a tire so next time you spring a leak between your treads, you'll be able to get up and running again in record time.

Total time completing the repair is about 15 minutes. Doing the work yourself will save you about $20 and the time spent driving to the garage and waiting.

Tools Required

  • Car jack
  • Pliers
  • Spray Bottle
  • Tire plugging kit
  • Wire cutters

Materials Required

  • Paper towels
  • Soap and water solution
  • Tire plug strips
  • Tire sealing cement

Project step-by-step (7)

Step 1

Find the Leak

  • Pump enough air into the tire to fill it out and make it firm to finger pressure.
  • Examine the tire closely to find the leak. There’s no need to remove the wheel from the vehicle for this, but you will find it handy to lift the vehicle up with a car jack to take the weight off the tire and allow it to be rotated.
  • Spray the tire methodically with a spray bottle containing a mixture of 20 percent soap and 80 percent water, if the location of the leak isn’t obvious. Constant bubbles indicate the location of the leak.
  • Use pliers to pull out any nail, screw, staple or stray metal that has caused the leak.

Find the LeakSteve Maxwell for Family Handyman

Step 2

Ream Out the Hole

  • Jam your T-handle reaming tool into the hole, then work it up and down several times while rotating it. This widens the hole and roughens the inner surface in preparation for plugging.
  • Pull the reaming tool out and inspect the hole. If it’s not yet round and uniform, reinsert the reaming tool and work it up and down some more.
  • Sometimes, with tiny holes, the reaming tool won’t insert into the tire. In cases like these, use a hand-held drill with a drill bit slightly smaller than the diameter of your reaming tool. Use the drill and bit to enlarge the hole, followed by the reamer to roughen the sides of the hole.

Ream Out the HoleSteve Maxwell for Family Handyman