Can my puncture be repaired?
To help the chances of your puncture being repairable the most important thing that you can do is not drive on it when it is flat. Driving for even a few hundred metres on a flat tyre can cause further damage and make it unrepairable. As soon as you notice that a tyre is flat, stop safely and either replace it with the spare or use the tyre sealant and inflation pack provided.
etyres' mobile tyre fitting vans are equipped to fix punctured tyres at your home or workplace. All puncture repairs carried out by etyres are made in compliance with the British Standard BS AU 159, detailed below. This standard covers many aspects of the repair, but the main points which mean that a tyre can be repaired are:
- The tyre has been punctured by something small like a nail or a screw, and not something large like a piece of broken glass or damage from hitting a kerb or pothole
- The puncture has happened in the central area of the tread, and not near the edges or in the sidewall
- The tyre has not been driven on when flat as this causes the sidewalls of the tyre to be weakened, making a repair unsafe
Any tyre that visually conforms to the above guidelines will be removed from the wheel and fully inspected for internal damage. This is to determine if your puncture can be repaired in line with British Standard BS AU 159.
British Standard BS AU 159
There are British Standard guidelines to which we have to adhere to when inspecting a punctured tyre. These enable tyres to be repaired to operate at their original speed and load capabilities.
All etyres vans carry a British Standard BS AU 159 gauge. If the puncture is in the shoulder or side-wall of the tyre, it cannot be repaired. If this is the case the etyres fitter will show you, using this gauge.
Minor penetration repairs are only permissible in the “T” area of the diagram below:
The repairable area ‘T’ is defined as a percentage of the nominal section width and this is dependent on the type and size of the tyre. The calculated width values for area “T” are displayed below:
|TyreNominal SectionWidth||‘T’ Value mm||TyreNominal SectionWidth||‘T’ Value mm||TyreNominal SectionWidth||‘T’ Value mm|
If your tyre can be repaired we will remove any objects embedded in the rubber, such as nails, stones or glass, and carry out the puncture repair. The tyre will then be refitted to the vehicle and the wheel will be balanced.
Prior to any puncture repair commencing, the following process is undertaken, in line with BS AU 159:
- We will remove the tyre from the wheel and thoroughly inspect it both internally and externally. No inspection should take place with the tyre on the wheel
- We will inform you if a repair is not possible due to any of the following:
- Inadequate tread depth below the legal minimum
- Splits, cuts or rubber cracking reaching the casing
- Casing break-up
- Previous repairs outside the scope of BS AU 159, unless they are specialist repairs carried out by the original tyre manufacturer
- Significant contamination by solvents
- Bead damage, including broken bead core
- Liner deterioration
- Secondary effects, for example under-inflation/deflation damage or savaging by the point of a penetrating object
- Exposed cords due to tread wear or sidewall scuffing
- Tread or sidewall rubber separation
Definition of Tyre Repairs
Tyre repairs should only be carried out by specially trained personnel using professional equipment and it is important to remember before any tyre can be repaired, it must be checked thoroughly to ensure it is suitable for repair. Ensure that you check for the following:
- Legal tread depth (UK car: 1.6mm across central 3/4 of the tyre tread throughout the entire circumference)
- Run-flat damage
- Secondary damage – caused by the injuring object
- Ageing/deterioration of tyre rubber
- Bead damage
- Exposed cords
- Faulty/poor previous repairs
If the tyre has experienced any of the above, it should not be repaired. The above list is not exhaustive. Inspection is vital and the use of common sense – if you have doubts about whether or not a tyre should be repaired, do not repair it.
Tyre repairs are covered under British Standard BS AU 159f and below is an excerpt from this standard showing some of the limitations that apply regarding the area in which a tyre can be repaired (known as the “T” area) and size / number of repairs:
The repairable area T is defined as a percentage of the tyres nominal section width and is dependant on the type and size of the tyre
Chart to the left shows the percentage of the T area for different size/types of tyres
This chart shows the limitations that apply to the number of repairs allowed to a tyre and also the limitation on the size of the injury
Can I check if my tyre is repairable myself?
Click here to download a free repairable area tread gauge to see for yourself if it is likely that your tyre can be repaired. (Please note this is not a guarantee of suitability for repair.)
To book a puncture repair call our National Sales Team on 0800 028 9000.