Tire with nail image by John Goreham
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Here’s Why Your Tire Cannot Be Repaired

Many vehicle owners feel frustrated when they have a nail in the tire and are told by a tire shop that the tire cannot be repaired. Here are a few common reasons why it can’t be fixed.

So you just either rolled up to a tire shop on a flat, were towed in, or drive in with your spare on the car and the flat in the trunk. You have important things to do today, and since you can clearly see there is a nail in the tread, you expect to be told that the nail can be pulled out and tire fixed quickly. However, after a quick glance, the tire shop says, “No can do Bubba.” They are not just trying to sell you a new tire. There are real reasons why many flats cannot simply be patched.
Tire image with cracks by John Goreham
Reason 1 Why Your Tire Cannot Be Repaired – You Drove On The Flat
Modern tires have an inner structure of the sidewall that is not designed to support your vehicle when uninflated. You can usually get away with a flat tire rolling without air for a short distance – think yards, not miles. However, if you just drove 10 minutes on the flat, you destroyed that important sidewall structure and the tire cannot be repaired.

Related Story: Tire Shortages and Delays: Not Just For Tesla Owners Anymore

Reason 2 Why Your Tire Cannot Be Repaired – Your Puncture Is In The No Repair Zone
Modern tires also need to be puncture-free along the sides and in from the sides about 20% on both sides of the tire. If your puncture is near the sidewall you are out of luck. Tire shops need to keep customers safe, and they follow the standard industry guidelines and will not repair a puncture too close to either sidewall. And they should err on the side of caution. Most do.
Tire bubble image John Goreham
Reason 3 Why Your Tire Cannot Be Repaired – Your Tire Has Other Issues
If you have a bubble, a tear, or a big honking carbuncle on the side of your tire, it is unrepairable. Even if that is NOT why your tire went flat. If you have any area of the tire worn beyond the tread wear indicators, your tire is not repairable. If your tire is older than the internet, your tire is not repairable. If your tire is unevenly worn and any of the metal parts inside are visible your tire is not repairable. We can keep going. Basically, if your tire was not safe before the puncture, your tire shop would be crazy to try to repair the puncture. According to NHTSA, hundreds of people are killed each year due to tire failure. Your tire shop does not want you to be killed due to tire failure with the receipt for the repair sitting in the cupholder.
BMW run-flat tire image by John Goreham
Reason 4 Your Tire Cannot Be Repaired - You Have Run Flat Tires
Many shops will not repair a run-flat tire that has had a puncture. Although run-flats are designed to get you to a shop or home when you have a puncture, they may not have been designed to then be repaired and continue in service after having been driven when deflated. This is one reason we give run-flat tires like those on BMW vehicles a thumbs-down.

Reason 5 Your Tire Cannot Be Repaired - The Puncture Is Too Large
If the puncture in your tire isn't just a normal nail or screw, but rather a chunk of metal, your repair shop will tell you to buy a new tire. Sometimes the metal bruises or gouges the tire either inside or outside and the plug and patch method of repair is simply not safe to perform.

Meteorite tire puncture image by John Goreham

Reason 6 Why Your Tire Cannot be Repaired - It Was Struck By A Meteorite
We recently had a puncture that we surmised was a meteorite strike. Yes, it sounds crazy, but read our story and tell us if you have a better guess.

Take care of your tires and they will take care of you. If you have a tire-repair story to tell, feel free to offer it up in the comments below.

John Goreham is a life-long car nut and recovering engineer. John's focus areas are technology, safety, and green vehicles. In the 1990s, he was part of a team that built a solar-electric vehicle from scratch. His was the role of battery thermal control designer. For 20 years he applied his engineering and sales talents in the high tech world and published numerous articles in technical journals such as Chemical Processing Magazine. In 2008 he retired from that career to chase his dream of being an auto writer. In addition to Torque News, John's work has appeared in print in dozens of American newspapers and he provides reviews to many vehicle shopping sites. You can follow John on Twitter, and view his credentials at Linkedin

Images by John Goreham. Use with permission only.

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that no repair zone is a scam. Tire manufacturers need to be very clear about the no repair zone. They are not on purpose. These days it seems like 60% of the surface is no repair zone.
The no repair zone is not a scam. The closer you get to the sidewall the more flex you will have, risking the repair to fail prematurely. Also, a plug alone is not an effective repair. Tires need to be patched on the inside.
That's why I usually just plug it. Tire shops have insurance thus they have a narrow repair criteria. Have plugged so many nail holes over the years and not one has ever leaked. As long as the hole is a simple puncture and has not ripped thru a band then why not plug it?
Are the Puncturesafe methods good. ie: (liquid inserted into tyre that seals punctures immediately) and tyre is supposedly as good as new.
Once used the temperature of the tyre will rise and in HOT conditions and on long distance trip will exceed the safe area of operations, possible leading to blow out.
My inflation indicator light came on. I stopped and put air in the tire. It is a run-flat tire. 3 days later, the pressure was again down by 10 pounds. I filled it and drove to a garage, and had the tire switched out with the spare. The run-flat tire was never driven on when flat. It has a nail in the flat part of the tire. Can it be repaired?