Looking to have a spare to throw in the back for long journeys,

Different offsets too. RS5 is ET26 and the 20 inch RS6 wheel is ET21. When you factor in the width difference too it is a fair but not significant difference.almoRS wrote:RS5 wheels are 9x20 on a 265x30 tyre.
RS6 wheels are 9.5x20 on a 275x35 tyre
Might be driveable but I wouldn't risk it.
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