Welcome to the group.
I didn't think changing wheel size could do any damage to the drive system. As long as the four wheels are the same size they will spin at the same rate. What you will find is that your speedo will not read accurately if you exceed the OEM recommended wheel/tyre size.
What you must be careful about is replacing say 2 out of 4 tyres. The difference in tread depth can cause fatal damage to the viscus link in the quattro system.
Cheers.
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