265/30R19 front · 245/35R19 rear

Why it’s first: AO — Audi: Audi Original: developed with Audi for the model — steering precision, comfort and noise at the car's weight. On a quattro the rolling circumference has to match front to rear for the centre differential, and AO tyres are built to that tolerance. The approved sets come before the rest.

Why it’s first: RO1 — Audi Sport: Audi Sport's approval for the RS and R models: tested at the speeds and heat those cars reach, with a casing to carry the power (RO1 the first release, RO2 the revision). The approved sets come before the rest.