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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Wheels and Tires -- Sponsored by The Tire Rack > Different sized tires front/back
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      10-17-2019, 03:57 PM   #1
Daves430
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Different sized tires front/back

Hi BWM fans,

I bought a used 430 with two original run flats tires and a pair of new non run flat tires. I hate the run flat tires. I find they loud and hard riding. The tires are currently stock size 225/45/18. I wanted to increase the width to 245/45/18 for aesthetic reasons as well as having a little more side wall for a softer ride. The 245's have a diameter of 26.7 inches vs the stock tires height 26 inches. Would there be a problem running 245/45/18's on the back(replacing the run flats) and keeping the 225/45/18's on the front? I don't know if this will hinder the ABS braking and tracking control. Your help is appreciated!
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      10-17-2019, 04:40 PM   #2
chowser51
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Is it xDrive?

Will the 245s fit ok on the original wheel width?
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      10-17-2019, 04:58 PM   #3
Daves430
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I should have mentioned that the care is RWD. I guess that I should be more concerned about the ABS braking. The run flats were probably 26 inches in diameter when the tread was new at 11/32 tread depth. I probably lost 1/3 inch more in height with the half worn tread. And yes, the 245 will fit on the stock 8 inch rim.
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