Audi RS6 C8 Riviera RF108 22ndJan Car Enhancements UK have given Audi’s latest wagon an upgrade, with a set of 22″ Riviera RF108 finished in Gloss Black to finish off the already perfect Audi RS6 C8. DETAILS RF108 – 22×10.5, ET15, 5×112 TYRES – 295/30/22 VEHICLE – Audi RS6 C8 VIEW WHEEL