255/30 21 would work on the same width, but they ain't cheap at more than £250 a corner for something decent.
Why 21s, most go for 20s on the D3 as larger especially with lowering links will give you a crash harsh ride with unpredictable handling.
The QS is already lowered 25mm compared to standard, and the lower you go the harder the suspension gets regardless of MMI setting. If you go to low then you run the risk of bottoming out the suspension especially in dynamic mode.
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Manny
2004 A4 1.8T Sport Cabriolet, 89K Miles
Past
2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly
with retrofit AMI and DVB-T in place of Analogue
2003 Volvo S60 D5 SE Manual, 197K miles.
2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
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