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Documentation matters most in the failure case. If a wheel comes loose because lug nuts were not torqued, or a fresh tyre fails and causes damage, your route to compensation runs through the provider's commercial identity and their liability insurance. Licensed garages carry insurance precisely because wheel and tyre work is safety-critical; an unlicensed operator with a borrowed compressor carries nothing. This is one of the quiet advantages of booking through a platform that vets its vendors: tamam lists verified providers with transparent AED price ranges, and the booking, payment and job record all live in the app, which means there is always a documented trail of who did what to your car and when.

A last practical check is behavioural rather than bureaucratic. A competent fitter uses a torque wrench for final tightening rather than hammering the impact gun to maximum, resets or checks the TPMS after the job, sets pressures to the placard on your door jamb rather than a generic number, and tells you unprompted to re-check torque after the first 50 to 100 kilometres. Any one of those habits is a good sign; all four together mean you have found your regular, and same-vendor rebooking exists for exactly that moment.

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.