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2015 White on Black Premium: 1436whp/1054wtq on E90, built by Cicio North
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What actual tires are you using? I like to double-check their website for the actual tire specs in each size to check the overall rollout diameter.
 

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2015 White on Black Premium: 1436whp/1054wtq on E90, built by Cicio North
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According to Michelin, the 285/35/20 and 315/30/20 are 0.4" apart in circumference and that represents a 1.4% difference. That should be fine in terms of keeping the AWD system happy.

My Mickey Thomspon drag setup is 0.3" apart and is perfectly fine.
 

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According to Michelin, the 285/35/20 and 315/30/20 are 0.4" apart in circumference and that represents a 1.4% difference. That should be fine in terms of keeping the AWD system happy.

My Mickey Thomspon drag setup is 0.3" apart and is perfectly fine.
Yeah I haven't had any issues, for the perfect match 335/30/20 is almost dead nuts with the 285/35/20 but Michelin only makes that size in the Supersport and not a PS4s. I don't think running the 2 different tires would hurt anything for normal/spirited driving.
 

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Yeah I haven't had any issues, for the perfect match 335/30/20 is almost dead nuts with the 285/35/20 but Michelin only makes that size in the Supersport and not a PS4s. I don't think running the 2 different tires would hurt anything for normal/spirited driving.
The 335/30/20 front and 285/35/20 rear tires can be had in cup2’s. That’s what I’m using.
 

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I have 275/35/20 in the front and 315/30/20 in the rear, is that safe ? i bought the car with those. Im having awd issues now I think, but not sure it is related
I bought my 15 with brand new 285/35/20 F and 315/30/20 R Michelin PS4-S, with that set up there is a 1.8% difference between front and rear. I've read there is a 0-3% tolerance for the cars and I wasn't having any issues. I still swapped out the rears with Michelin SS 335/35/20 which put front and rear the same. My speedo is back to normal now and the miles driven are now correct. With the 315/30/20's it was adding a extra 1/2 mile for every 23 miles driven because more revolutions per mile with the 315/30/20 being a smaller diameter than what comes stock and the way the car is calibrated.
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