There are a number of Audi Q8 tyre options at Tyres.co.uk, including the Continental SportContact 5 and the Pirelli P Zero, in 285/45 R21 113Y XL size. Ensure you check the B-Pillar label or registration results, as factory wheel specs, load and speed ratings can vary.
The tyre specifications for the Audi Q8 can be found on the tyre pressure label located on the B-pillar, which is on the driver’s side. This displays the size of the tyres and the approved cold pressure. Check this against the registration before purchasing a new set of tyres.
The Audi Q8 does not always require four new tyres, but each version uses quattro four-wheel drive, which means all four must share the same brand and style, in both construction and tread pattern. When you replace at least one axle pair/two new tyres, you then have to put the new tyres on the rear axle.