If your car runs wider tyres at the back than at the front, a roadside failure carries one extra rule with it: nothing can be borrowed from the other end. On a staggered fitment the rear tyre is a different size from the front, and often the rear wheel is a different width and offset too, so it will not bolt on where the front was.
That rules out the two things people fall back on. You cannot move a sound tyre from the front to the back to get home, and a space saver, if the car carries one at all, is usually sized for the narrower end only. The correct tyre for the axle that failed has to be brought to the car, and there is no rearranging your way out of it.
What we ask for on the phone, then, is both sizes rather than one. Read the string off a front sidewall and a rear sidewall, tell us which end has gone, and we confirm what is aboard before setting off. A failure at either end means a replacement in any case, because the casing tears itself apart and leaves nothing to repair.
Get yourself somewhere safe first, and only then start ringing anybody. That means as far off the carriageway as you can get, hazards on, and everybody out on the far side of the car. Whether it is Raynes Park in rush hour or Robin Hood Way at midnight, we answer. On Kingston Road, day or night, Raynes Park included, arrival across SW19 runs 30 to 60 minutes.

Burst tyre replacement in Wimbledon is part of our wider 24-hour emergency callout across London and the home counties cover. For burst tyre replacement in Wimbledon, call 07717 389637 or send us your details for a price.
Wimbledon Hill Road puts you somewhere with traffic behind and very little room at the side. Worple Road is no kinder. A staggered car gives you fewer options once you have stopped, because nothing can be swapped across and the only thing that ends the wait is the right size arriving. Reading both sidewalls before you ring saves more time than anything else.
A driver on Kingston Road had a full-size spare in the boot and it was the front size. The rear that had failed was considerably wider. That spare belonged on the front axle and nowhere else, so the correct rear came out to the car.
Someone stopped near Raynes Park read us the front string and the rear string before we loaded up. They were different, as expected, and the right tyre came out first time instead of turning it into two journeys.
A car pulled up on Merton High Street lost a nearside rear with a nearly new tyre on the other side. Fitting a single matching tyre was correct there. Where the survivor is half worn, the pair should go together.
Only if the spare matches that axle. On a staggered car it will not match both, and on many it matches neither, because the space saver under the floor is sized to the narrower front. Check what is printed on it.
Read the sidewall of a front tyre and a rear tyre and compare. On a staggered fitment the width, and often the profile, differ front to rear. Owners frequently have no idea until something goes wrong.
It depends what the survivor measures. A pair on one axle should be close in tread depth and identical in type, so if the other rear is well worn it makes sense to do both. If it is nearly new, one tyre is right.
Common car, SUV and 4x4 fitments travel with us, and the wider rear sizes are less certain. Ring with both numbers and we tell you honestly whether it is on the van, coming from stock, or a wait.
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