Audi Quattro tyre options at Tyres.co.uk include the Michelin Primacy 3 DT and Bridgestone Turanza T005 in 205/60 R15 for 1980-83 cars originally fitted with this size. Confirm the tyre's load index and speed rating against the fuel-filler-flap placard and handbook before ordering.
Inside the rear-right wing fuel-filler flap, Audi Quattro tyre sizes are displayed on the tyre-pressure and tyre-information sticker. The sticker contains cold pressures and approved fitments; due to the possibility of non-original wheels being fitted to many surviving cars, verify against the tyre sidewall and handbook.
The Audi Quattro does not require four new tyres to be purchased. However, its fully integrated four-wheel drive system does require that all four tyres closely match (in terms of size, construction, rolling circumferences, and tread depth). Always replace all four tyres if a matching pair cannot be maintained. When replacing two tyres, the recommendation per UK tyre safety standards is to place the new tyres on the rear axle.