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Re: Rear tyre options
Factory fit for the 9" is 255/40/17.
Changing to 245/45/17 from 255/40/17 would result in;
Geometry Calculations:
change in ride height 8.3 mm
inwards add'l width req'd -5.0 mm
outwards add'l width req'd -5.0 mm
add'l total tire height 16.5 mm
add'l vert clearance req'd 8.3 mm
additional rolling diameter 51.8 mm
change in drive ratio 2.6 %
A better bet would be 245/40/17, the 40 profile rather than 45, it`s a closer match.
You`d get a slight reduction in understeer at the expense of less traction at the rear.
You might want to consider leaving the rears at 255/40/17 and changing the fronts from 235/45/17 to 245/40/17. This will tramline more and put more stress on the steering, but lessen understeer.
I run 265/40/17 and 245/40/17 in Pirelli. Overall traction is wonderful, tramlining not so good, plus it hurts the wallet.
Next on the list is the 20mm rear antiroll (sway) bar. This is supposed to make the car far more neutral understeer-wise when used with the big 9"J rear wheels in 17".
Hope this helps.
Ivan.
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"Never enter Karussell when on the brakes! I have gone round there on the roof, I know what I'm talking about." ~ Sabine Schmitz
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