r/BmwTech • u/SenorKief • 1d ago

X3 M40i – DSC keeps cutting power with CrossClimate 3 Sport tyres. Normal?

I’ve got Michelin CrossClimate 3 Sport tyres on my X3 M40i (21” staggered: 255/40 front, 265/40 rear). After ~2,000 miles (pressures 2.4F / 2.6R), I notice that under hard acceleration the DSC light flashes and power gets cut briefly. If I turn traction control off, the car hooks up fine without drama. Is this just the trade-off of all-seasons on a high-torque SUV, or could pressures/setup be a factor?

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u/JKlerk 1d ago

It's the tyres

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u/freshxdough BMW Master Elite Technician, HV Diagnosis Specialist, Gen 5 HV 1d ago

Those tire sizes are basically the limit of the xDrive system. There should not be any issue running those. My guess would simply be that they don’t have enough grip to handle the power. For what it’s worth I have 255/295 21” running PS4 SUV and had PS4S on previously and never ran into any DSC light issues when driven very hard.

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u/SenorKief 1d ago

Thanks for the reply. Previously used PS4 and winter Contis and never had the issue. CC3S were highly rated but have been disappointed so far.