On a four-wheel-drive car the tyres are part of the transmission, whether anyone thinks of them that way or not. A centre differential or a clutch pack sits between the axles and expects all four wheels to be turning at the same rate on a straight road. Fit one tyre with a different rolling circumference and they are not, and the difference does not go away. The mechanism absorbs it continuously, and heat and wear are what it turns into.
The gap does not have to be large to matter. A brand new tyre alongside three well-worn ones is already bigger around than they are, and on some systems that alone is enough to cause trouble over a long run. This is why the honest answer on a 4x4 is sometimes more than one tyre, and it is also why we raise it before anything is fitted rather than afterwards. Where a single replacement is fine, a single replacement is what goes on. Where it is not, you get the reason in plain terms and the decision stays yours.
The tyre let go on the way home and the car is now sat where it stopped. That might be the drive in Marlow Bottom, or it might be a lay-by that seemed like the best of a bad set of options. Christmas Day in Munday Dean, any day in Pound Lane: the line is open. Ring at 3am from Dean Street and someone answers; Higginson Park at noon is no different.
Emergency tyre replacement in Marlow is part of our wider 24-hour emergency callout cover. For emergency tyre replacement in Marlow, call 07717 389637 or get a price for your tyre.
There are a lot of 4x4s and all-wheel-drive estates on the roads around Marlow, and they do everything from the school run to a fast trip down the A404. The drivetrain question comes up often enough here that we would rather raise it at the kerb than have somebody discover it through an expensive noise a year later.
An all-wheel-drive car on the A4155 had lost one to a cut wall. The remaining three were low enough that a new tyre would have been running noticeably larger. We laid out what that does to a centre differential and let the owner decide with the facts in front of him.
Width and rim diameter are the easy part. Load index, speed rating and whether the tyre is reinforced all belong to the original specification, and a heavy 4x4 dropped onto a lower-rated tyre is carrying more than that tyre was ever built to carry.
The rotation arrow on a sidewall is not decoration. A directional tread fitted backwards clears water in the wrong direction, which is precisely the condition it exists to deal with. It gets checked before the wheel goes anywhere near the hub.
Sometimes, and it depends on the system and how worn the others are. The concern is rolling circumference. If all four wheels are not turning at the same rate, the centre differential works against itself constantly.
Smaller than people expect. Manufacturers publish a tolerance for their own systems and it is usually expressed as a slight difference in tread depth rather than anything you could see, which is why it gets measured.
Yes, all four get measured as a matter of course, along with pressures and the general state of the sidewalls. It adds very little time and it can change the advice we end up giving.
You will hear that before we set off rather than after we arrive. The usual sizes are carried as a matter of course across the price tiers, and anything unusual is confirmed on the phone first.
It is more forgiving, because nothing is trying to reconcile two axles. Matching still counts across an axle, but a single replacement is much more often the straightforward answer on those cars.
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