At around 22,000 miles, with an estimated 6000-8000 miles of legal 'meat' left on its tyres, our Range Rover started to feel a mite fidgety. I began to notice a faint rumble through its aluminium structure on coarse surfaces where there hadn’t been any rumble before.
Nobody seemed much bothered about it, probably because it was something you feel primarily at the steering wheel rim, but I have a fetish about refinement in cars and hate to see it decay. I’m quite sure if I had all the money in the world, or even a tenth of it, I’d junk those tyres now (at £300-plus a corner). Not only that, I’d ring up the engineers and find which of the OE tyres was the quietest, and fit those…
The VXR8 came to us over a weekend, for a bit of sport, on 'seasoned' tyres: sidewalls chamfered, treads well legal but also well used. We’d already road tested another car on perfect rubber and pronounced it better in most key respects than equivalent Merc and BMW saloons, so the pressure was well and truly off.
Our kind contact at Vauxhall was merely trying to afford me a bit of extra Easter driving pleasure - and I admit I did set out on a couple of occasions to “do” several deserted roundabouts I know. When a car can slide so beautifully and predictably as a VXR8, it seems a crime to keep it straight all the time.
However, the state of the tyres meant the car didn’t steer as well as the optimal version we’d sampled a few weeks before. Had I owned it, I’d have had to swap the rubber immediately (also at £300 a corner) because this car was no longer doing quite its best work.
So it seems to me that the true answer to the query above is that tyres are knackered when you think they are. At least, that’s true if you want your car to point and track as well as it was originally designed to, which seems to be the point of being the driving enthusiast we all are.
Which, in a way, limits your choice of car — you need to choose something whose tyres you can afford to swap more often than the law says you must. Which especially validates Toyota’s approach to tyres with its GT-86, a sporty car that drives beautifully on the same hoops used by the fuel-sipping Prius hybrid saloon. Seems Toyota just can’t stop teaching us lessons about efficiency.