A bulge in a sidewall is broken cords, not trapped air. The belt inside has parted, usually against a kerb edge or the lip of a pothole, and what is left holding the pressure in is rubber doing a job it was never designed to do alone. There is no repair for it, no keeping an eye on it, and no squeezing a few more weeks out. That is the plainest verdict we ever hand out. Most of what we get asked to look at is far less clear cut: a scrape picked up in a narrow lane, a cut that may or may not have reached the fabric beneath, or the fine crazing that appears on tyres kept on a car that barely moves. We look properly, we tell you which of those it is, and when the tyre is sound you keep your money.
Sidewall damage is the one that catches people out. A kerb taken badly on Windsor Road will do it as readily as a pothole will. If that is what you are looking at, whether the car is in Pooley Green or anywhere else in Egham, the answer is a replacement, and it is better fitted where the car is standing than at the end of a nervous drive. Tight in Thorpe, easy in Pooley Green: neither stops the job. Level in Pooley Green, sloping in Virginia Water: we set the car straight first.

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Fast roads punish a damaged tyre far harder than town driving does, and the A30 and the motorway junction are on most local drivers' daily route. If something looks wrong on a sidewall, it is worth ten minutes of somebody's attention before the next fast run.
A tyre with three quarters of its tread left and a swelling the size of an egg on the inner shoulder. It had been carrying that at motorway speed for some time without the owner knowing. Replaced there and then, because there is no other honest answer to a broken belt.
A wheel put into a kerb in a tight lane near Thorpe. The alloy was scarred and the owner had assumed the worst about the tyre. The bead was seated correctly, there was no swelling and nothing had opened to the fabric, so it stayed on the car and we said so.
A second car doing short local trips, tyres barely worn but hardened and crazed across both sidewalls. Age does that whether the car moves or not, and old rubber lets go without warning, so the pair came off before they had a chance to.
Not necessarily, but it is worth a look. An impact hard enough to mark the rim can trap the tyre between rim and kerb, and what that does is hidden inside the casing where nothing shows from outside.
Usually enough to know whether it needs dealing with today. A firm verdict wants hands on the rubber and, for anything borderline, the tyre taken off the wheel.
If it is surface scoring in the tread rubber and the fabric underneath is untouched, the tyre carries on. Once you can see cord, it is finished, however small the opening looks.
A good share of these inspections end with us telling people their tyre is fine. The 4.9 rating on Google is built on saying that out loud rather than reaching for the invoice book.
At 1.6mm, and it has to hold over three quarters of the width in the middle of the tread for the full circumference. Wet grip has usually gone long before you reach that figure, so legal and safe are different questions.
★★★★★ 4.9 from 151 verified Google reviews.
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