Took off my summer setup ( the staggered 20's setup for the 4.8). Installed the winter setup which I've been told the 18' would be perfect but after I installed the 18's (I did maybe 10-20 KM), the red warning sign went on and disabled both the DSC and ABS....

Would this have anything to do with going from the 20's to the 18's or is this a completely different problem?

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His : 2005 X5 4.8is (SOLD)
Hers: 2007 X5 3.0si (SOLD)
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Retired:
1999 518
2000 323i
2002 M3 (beautiful car)
2003 330Ci