Understanding the correct time to replace car tyres

puncture car

Unfortunately, you can do nothing to save your tyres from getting damaged as broken glass, potholes and nails are part of your journey on the road. But, in case your tyres get damaged and your budget is less this month, you will wish to have tyre repairing rather than replacing it.

Determining the damage extent and type is the first step while taking the tyres’ overall condition into account.

Which Tyre Damage type can be repaired?

  • Repairing holes greater than about 5 – 6mm won’t be safe.
  • You can’t repair a blown-out tyre, sidewall damage, internal damage, huge gouges, or deep cuts.
  • You can easily repair the small punctures in the car tyres tread or outer wall made by sharp objects like a screw or nail.

When is a tyre considered worn out?

To expose the wearing of a tyre to its safety limit, tread wear indicator bars are moulded into the grooves of the tread around the tyre at regular intervals. The legal minimum depth of the tread is 1.6 mm across the tread width. With the tread surface, the bars will be flush when the tyre is worn to the legal limit. Although the legal limit is specified by the car manufacturers that you need to replace the tyres before they attain the extent limit.

Repairing a tyre puncture in the correct way

Tracing a flat tyre in your car is never good. If you have some work to go out for or a planned trip.  The most common reason for a tyre puncture is sharp objects like glass shards, nails and screws although any sharp object on the road causes tyre puncture.

To verify complete details about the damage, you must get the tyre properly inspected even though the puncture may seem to be small. This will ensure if any other damage is caused by driving on low pressure inflated tyres.

The tyre must be replaced instead of being repaired if it is assumed that no damage to the tyres is found. Two major aspects to be addressed in any tyre repair is:

  • The point and the path where the object penetrated into the tyre must be filled.
  • Within the tyre, the airtight inner liner integrity must be re-established.

Out of the different types of tyre puncture repairing options available. There are three methods used in the majority of cases. However, only one out of these three is termed as the best practice. The rubber closes up when the object puncturing the tyre is taken out, and the puncture location is visible hardly. For repairing a small puncture, there are three various ways:

Combination of patch and Plug

The tyre is repaired using a combination of plug and patch. 


The tyre is removed from the rim in the patch method, the damaged area is located, and the surface is prepared for repair with a patch.


However, the puncture is repaired externally without removing the tyre from the rim in the plug method.

When must you replace the spare?

Almost every car owner or driver forgets about the spare tyre, which stays idle in the car boot unless it is needed urgently in an emergency. You must use the spare tyres older than six years only in an emergency. You can also search for cheap tyres online and purchase them. A tyre more than 10 years old must be replaced.

When do you need a tyre replacement?

Many auto mechanics may tell you that you need to replace the tyres just by having a look at them and guessing they are worn.  But, you need not go by their words but inspect the car tyres yourself. You must check the grooves’ depth by visually inspecting them for damage and wear.


You must not compromise with safety. Replacing is best if a tyre is damaged badly. You can go a few thousand miles safely by repairing small punctures. However, a qualified mechanic must repair the tyre professionally.