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You don't multiply by two according to TireRack.
225 x 0.40 = 90mm
255 x 0.35 = 89.25mm
So that's a difference of 0.75mm.
That's assuming they aren't stretched or otherwise out of standard spec. He says the rears are 11". The 255 is a 10" tire, so that's definitely stretched. Front is 9.5", but the front tires are 8.85", so those are stretched too. I'm leaning toward the tires not being a close enough diameter due to the stretch.
Another possibility is maybe the DTC/ABS cable is getting rubbed.
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