Quote:
Originally Posted by Trimix
I cant follow. Maybe silly question but why is the track narrower ? 9x18 ET29 summer and 8,5x18 ET27 with same (255) rubber. Winter wheel sits 2mm farther out with ET27. Wheel is 1/2inch slimmer but rubber "sticks out" a bit more. Or am i completely wrong ?
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Offsets are measured from the wheel centerline. So yes it's inset 2mm less than the summer wheel, but then you have to lop 6.35mm (¼") off each side for the narrower wheel.
Edit: I see what you are saying now. Since the tire width isn't changing, track width is not effected by the narrower wheel. You're absolutely right - the track width is actually 2mm wider. My mistake
Even still, it does not explain why the need for the narrower wheel.
Quote:
Originally Posted by JoeFromPA
Could be to increase understeer for winter driving?
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Possibly. I still don't see why they had to narrow the wheel to accomplish it though. They could have just increased the offset.