The only place I know that you can input any wheel data is in Adaptation Channel 01, Nav module. Format is wheel circumference in MM. It's supposed to be used to correct the navigation. It may or may not be used by 0x17 for the speed limit gong. Worth a try changing the value.
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Matt
2004 A8 3.7q, 1998 A4 2.8q, 1994 Coupe 2.8q SORN,
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