Next to the size on the sidewall there is sometimes XL, or Extra Load, or Reinforced. They all mean the same thing: a stronger casing designed to carry a higher load at a higher inflation pressure than the standard version of that size. Cars are specified for it deliberately. Heavier estates and SUVs, cars with a lot of weight over one axle, and anything designed to be loaded up will have XL on the placard for a reason, and the load index alongside it is the number that reason is expressed in.
Here is the trap. A standard load tyre in the same size fits the same rim, looks identical from three feet away and gives no clue whatsoever from the driving seat. It is simply rated to carry less than the car asks of it, and it runs at a lower pressure to do so. At half past one in the morning with one tyre to replace and a driver who wants to be home, matching only the size is an easy mistake and an invisible one. So we read the markings off the tyre coming off and off the placard in the door shut, and match the rating as well as the dimensions before anything goes on the rim.
Half the value of a 24-hour service is simply that somebody picks up. Ours dispatches: phone answered, van sent, work done where the car is standing, on Battersea Park Road or on a driveway, with a live ETA so the wait has a number on it. Whether it is Shaftesbury Estate in rush hour or York Road at midnight, we answer. On Lavender Hill, day or night, the Queenstown Road area included, arrival across SW11 runs 30 to 60 minutes. The SW11 postcode and a street in Clapham Junction: that is enough.

24-hour tyre callout in Battersea is part of our wider 24-hour emergency callout across London and the home counties cover. For 24-hour tyre callout in Battersea, call 07717 389637 or get a price for your tyre.
There are plenty of heavier cars and 4x4s in the resident bays around Battersea Rise and the terraced streets off Lavender Hill, and those are exactly the cars where this marking matters. The placard in the driver's door shut is perfectly readable with a phone light at any hour, and the load figures on it are worth reading before you ring rather than after we arrive. Tell us what the tyre coming off says as well, and the one going on will match it at three in the morning as readily as at three in the afternoon.
A heavier car had one standard load tyre among three XL, fitted somewhere in a hurry. Everything about it looked correct and it was the only tyre on the car not rated for what the car weighs.
An XL tyre alongside a standard one on the same axle runs at different pressures and stiffens differently under load, which is not something you want at the same end of the car.
A late job on a terraced street off Lavender Hill where the owner read the load figures out of the door shut with a phone light before we arrived, so the correct tyre came off the van first time.
Extra Load, sometimes written as Reinforced. The casing is built stronger so the tyre can carry more weight, and it is designed to run at a higher pressure to do it. It is a load rating rather than a performance upgrade, and it is specified by the car maker rather than chosen for effect.
The placard in the driver's door shut lists the sizes with their load and speed ratings, and the sidewall of the tyre currently on the car will say XL or Reinforced if that is what it is. Between those two you have the answer without needing anybody's opinion.
Yes, in two ways. That corner is rated to carry less than the car may put through it, and it runs at a different pressure from its partner on the same axle, so the two sides of that axle behave differently under load and under braking. Neither is something you notice until it counts.
That is the normal way of it. We carry the common car, SUV and 4x4 fitments including the extra load versions, and we read the markings before we choose. If the size we have is not the correct rating for your car we will say so rather than fit it and hope.
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