A bulge on the outer sidewall is easy to spot from the pavement. The same damage on the inner face of the same tyre is close to invisible, and it is just as common, because whatever crushed the sidewall against the rim did not care which side it was on. People walk round the car, see nothing, and reasonably conclude that the kerb they clipped did no harm.
Getting a proper look means either turning the steering onto full lock, which shows you a useful amount of a front wheel, or taking the wheel off, which is the only way to see a rear one. That is worth doing after a hard knock, particularly on the forest-edge roads where hidden kerbs and verges catch the inner side of a wheel as easily as the outer. A bulge is a bulge wherever it sits, and it is not a repair, it is a replacement, and it gives no warning before it lets go.
Winter leaves the roads worse than it found them, and tyres pay for it in March. A wheel dropped into one on Woodford New Road can split a tyre from the inside without leaving a mark you would notice. Nothing is towed out of Highams Park or Charlie Brown's; the work finishes there. Pressures set before we leave Highams Park, and the same on Chigwell Road.

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The narrow streets around Snakes Lane and Woodford Wells put kerbs and verges close on both sides, and the forest edges hide them under leaves for a good part of the year. If you have clipped something hard, the check worth doing is the inner face rather than the outer, because that is the side that gets missed and it is where a fair number of the bulges we find have been sitting for weeks.
The outer wall is clean and the inner one is not. It is the same damage and it is simply on the side nobody can see without moving the wheel.
Turning the steering hard over reveals a good deal of the inner face of a front tyre. It is a free check and it takes ten seconds.
There is no equivalent trick at the back. If a rear tyre has taken a knock and you want an honest answer, the wheel has to come off.
No, and its position makes no difference. A bulge means the cords have failed and the tyre is finished wherever it appears.
Turn the steering onto full lock for the front wheels. For the rears there is no way round taking the wheel off.
Treat it as no distance. It might last a fortnight or it might not last the run down to the A406, and nothing about the tyre will tell you which.
Yes, and if the tyre is sound we say so and fit nothing. Describe it on the phone first and we can often narrow it down before travelling.
In most cases yes, from van stock, balanced and torqued at the vehicle, with the old casing taken away for recycling.
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