Tyres.co.uk lists the tyre options for Audi RS7 as the Michelin Pilot Sport 4 S and the Pirelli P Zero (PZ4) in 275/35 ZR21 103Y XL for the standard 21-inch wheels of the current C8 RS7 Sportback. The C8 RS7 has factory options for 22-inches as well, so confirm the approved spec with the registration prior to ordering.
On the Audi RS7, the tyre pressure label is located on the fuel filler flap on the right rear side of the vehicle. The label lists some pressure and wheel diameter specifications, but not an entire list of approved tyres; for specific tyre sizes and specifications, refer to the tyre sidewall and the vehicle's Certificate of Conformity or registration.
Every RS7 is a quattro, so each vehicle has all four tyres that must match in type, size, rolling circumference, and tread pattern. It's not correct that an Audi RS7 needs four replacements. As for replacement, it must be an axle pair; if the other pair cannot satisfy that matching requirement, then all four must be replaced. If a new pair is to be fitted, then it must be to the rear axle.
