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I am puzzled by the two stock tire/wheel options offered for the S6: 265/35 R19 (tire has a 26.3" diameter) or 255/40 R18 (tire has a 26.0" diameter).

Why would Audi offer two options that do not have exactly the same diameter (they could have offered a 235/45/18)? Isn't that an issue for the speedometer etc.?

Thanks.

Reggie

<ul><li><a href="http://www.miata.net/garage/tirecalc.html">It's actually very close on the odometer</a></li></ul>