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Old 03-21-2013, 11:18 PM   #2 (permalink)
BGTV8
A True Z Fanatic
 
Join Date: Dec 2009
Location: 03350 Australia
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Rear tyre diameter is ~30 mm smaller with your new rear tyres and my guess is the stability control is confused, and thinks the rear wheels are breaking into wheelspin with your steering inputs and it is intervening (maybe applying one brake to avoid a slide.

OEM rear is 245/45R18 and diameter is ~678mm, your new 245/40R18 diameter is ~654mm.

You need to do one of 2 things, and that is fit the proper rear tyre size, OR get smaller front tyres fitted to match the rears (235/40R18 will go close). Be best all round to fit 245/45R18.

The answer to your question is therefore "YES".
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