Tyre makers and the British repair standard BS AU 159 broadly agree: where the hole sits matters as much as its size.
A permanent repair is only judged properly with the tyre removed from the wheel so the inside can be seen.
The tread is thick, braced by steel belts and fairly rigid. The sidewall is thin and bends with every rotation while carrying the car's weight, so any plug or patch there is flexed constantly and the bond can fail without warning. That is why Michelin and TyreSafe both rule out sidewall repairs entirely.
The shoulder, where tread curves into sidewall, has the same problem plus higher heat. BS AU 159 limits repairs to the central three quarters of the tread width for that reason. If a nail has gone in close to the edge, a new tyre is the honest answer even when the hole looks tiny.
The tyre is inflated and checked for escaping air, and any nail, screw or glass fragment is located before anything is pulled out.
With the tyre off the rim, the liner is examined for scuffing or tearing that would mean the tyre was run too low.
The channel is cleaned out and the area around it buffed so the repair bonds to fresh rubber.
A plug-patch is drawn through from inside, pressed firmly into place and trimmed flush with the tread.
The tyre goes back on the wheel, is set to the pressure on your door placard and is checked again for leaks around the repair and the bead.
Emergency sealant buys time, not a cure. Continental's kit, for example, handles tread holes up to 6 mm and then limits you to 80 km/h for a maximum of 200 km, and TyreSafe calls such kits temporary. Mention it when you book, keep speeds down and get the tyre properly assessed within that window.
The sidewall figure is the most the tyre can safely hold, not what your car needs.
There is little point patching a tyre that is already too old to use. Dubai's RTA counts a tyre's life from its manufacture date and says tyres beyond five years are not allowed on UAE roads. The four digit code at the end of the sidewall marking gives the week and then the year it was made.
Heat is the other factor. UAE police warn that tyres often fail in extreme summer temperatures, and worn or unfit tyres are punishable with AED 500, four black points and the car held for a week. Hot roads also push pressure up as you drive, so take readings in the cool of the morning.
Often, yes. If the nail is in the central tread, the hole is no wider than 6 mm and the inside of the tyre is undamaged, a plug-patch repair is normally acceptable. Leave the nail in place until the tyre is examined, as removing it usually makes the leak faster.
Tell us where the car is and a technician will come to assess the puncture and repair it if the damage allows.
