Quote:
Originally Posted by BGTV8
No, simply suggesting that going back to the OEM tyre size for the rear is the most logical solution.
People need to realise that vehicles fitted with ABS and Stability Control rely upon the front and rear wheels rotating at the same speed and this can be affected by fitting tyres ith different diameters than the manufactiruer intended, because that affects one of the most basci stability control parameters.
If you are changing tyre sizes, then make sure that you respect the relationship between overall diamter of fronts and rears.
Your tyre shop should have been aware of this.
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Ding ding ding! Winner.
The problem is now your rear tires are 1 inch diameter less than the fronts because of the 40 series sidewall. You need 45 series sidewall with a 245 width.
Right your your front 225/50/18 have an overall diameter of 26.8 inches and the rear 245/40/18 have an overall diameter for 25.7 inches. This is a 4% variance which will throw your abs/vdc out of sync causing instability issues.
You want to stay within 1% variance when running staggered set ups.