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Modification is the second trap. Changing wheel and tyre sizes away from the manufacturer's approved fitments, fitting different sizes front to rear where the maker does not specify it, or deleting run-flats on a car designed around them are all changes an insurer can treat as undeclared modifications. None of this means you can never change anything; it means changes should stay within the approved fitment list in your handbook, and anything beyond it should be declared to the insurer in writing before renewal rather than discovered by a surveyor afterwards.

Liability also runs the other direction, toward the fitter. If a wheel detaches or a repaired tyre fails and the cause is workmanship, the workshop's insurance responds, but only if you can prove who did the work. Keep the invoice, keep the booking record, and photograph the DOT dates of newly fitted tyres. It takes ninety seconds and it converts a hopeless argument into a documented claim. The same records help in the ordinary case too: manufacturer warranties on tyres cover defects, not damage, and the distinction is argued with paperwork, so a dated invoice showing where and when the tyre was fitted is the difference between a goodwill replacement and a shrug.

Nitrogen inflation has real but small advantages. Nitrogen molecules permeate rubber more slowly than oxygen, so a nitrogen-filled tyre loses pressure somewhat more slowly over the weeks, and the dry gas carries no water vapour, which means slightly more stable pressures as temperatures swing and less internal corrosion of steel belts and TPMS valve hardware. In a country where the gap between a January dawn and an August afternoon can be 35 degrees, more stable pressure is a genuine, if modest, benefit. Airlines and racing teams use nitrogen for these reasons at extremes far beyond road driving.

One caution: mixed fills are harmless but pointless. Topping up a nitrogen fill with ordinary air at a petrol station does no damage whatsoever, and the widespread belief that it does keeps drivers running underinflated while they hunt for a nitrogen point. Correct pressure with plain air always beats low pressure while waiting for the right gas.

Annual registration renewal in the UAE runs through vehicle testing centres: Tasjeel and Shamil lanes in Dubai and the northern emirates, ADNOC inspection centres in Abu Dhabi. On tyres, the inspector's checklist is consistent: DOT dates within five years, tread depth above the legal minimum across the full width, no sidewall cracking, bulges or exposed cord, matching sizes across each axle, and sizes consistent with the vehicle's approved fitment. The spare gets less scrutiny than the road wheels, but a shredded or ancient spare invites a closer look at everything else.

A tread-depth check needs no tools worth mentioning: the wear bars moulded into the grooves sit at the legal limit, and when the surrounding tread is flush with them, the tyre is finished. Check the inner shoulder as well as the part you can see standing up, because alignment wear hides on the inside edge, and the inner shoulder is precisely where the inspector will look. If you want a number rather than a bar, any fitter carries a tread-depth gauge and will read all four tyres in under a minute; anything approaching two millimetres in a UAE summer is due for planning, not just monitoring, because braking distances in the wet degrade sharply well before the legal limit arrives.