Look along the sidewall past the size and you may find the letters XL, or the word reinforced. That is not marketing. It means the casing is built with extra plies so the tyre can carry more weight at a given pressure, and it is specified because the vehicle needs it, not because somebody fancied a stronger tyre. Cars that came on reinforced tyres from the factory should get reinforced tyres when one is replaced, because the standard version of the same size will be working beyond what it was designed for as soon as the car is loaded.
On urgent jobs this is exactly the corner that gets cut, because what matters in the moment is that something goes on and the car moves. We read what is coming off before anything goes on, and if the reinforced version of your size is not aboard we will say so rather than fit the standard one and let you find out.
Give us the full sidewall code and the answer comes back quickly. Width, profile, rim size, then the load index and the speed rating, something like 225/45 R17 94W. The letters at the end are not optional extras; they are what the car was designed around. A Wilby cul-de-sac or a Hemmingwell main road, tell us which. A tight terrace in Redhill Grange or a narrow bay on the A510 is usually workable.

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Wellingborough spreads a fair distance from Queensway and Croyland out to Redhill Grange, and the nearest fitting bay is rarely round the corner. That is the practical case for bringing the tyre to the car. The technical case is that being at the vehicle means we can read the plate and the sidewall together rather than guessing a specification down the phone.
Same width, same profile, same rim, and a lower load capability. It fits perfectly and it is the wrong tyre, which is what makes this one so easy to get wrong in a hurry.
Reinforced tyres exist for exactly this. Four people, a full boot and a run up the A45 is when the difference between the two specifications stops being theoretical.
Reinforced tyres often want different pressures from the standard version. We set them against the vehicle's own plate and tell you what they are before we drive off.
Look for XL, RF or the word reinforced on the sidewall near the size. Read us the whole line of markings when you ring and we will tell you what you have.
Yes, because that corner then has a lower capability than the other three, and it is the one that will be working hardest when the car is loaded.
You can, and they ride a little firmer. It is not a problem in the way that going the other direction is.
Common sizes travel on the van in the fitments that turn up locally. Read us the sidewall code when you ring and we will confirm what we have before setting off.
Typically 30 to 60 minutes across Wellingborough, whether you are at home, at work on one of the estates or on the roadside.
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