R32 Gts4 Tyre Rolling Diameter

[GTS4onP]

Hey,

I just bought some new rims for my GTS-4 the other day 18x7.5/8.5

they came with tyres 225/40r18 on the front and 255/35/18 on the back, i put those numbers into a tyre size calculator and it said that the circumference was 4mm bigger on the 255s, would that make much difference to the attesa system running in 4wd? I haven't run it in 4wd yet

heres the link to the calculator, quite a cool wee tool really http://www.miata.net/garage/tirecalc.html

Cheers

[blind_elk]

Whay don't people with AWD Nissans ever listen to the experiences of other people who have ATTESSA problems when they run different sized F/R wheels and tyres on their AWD Nissans?

The figures you put through the calculator are for NEW tyres. And the actual sizes may actually vary between manufacturers. Depending on the wear of the 255s compared to the 225s, you may encounter some ATTESSA problems.

[Moodles2]

Although the rolling diameter difference is 0.24%, to put it into perspective I get ATTESSA problems when I have new 225/50/R16s at the front, and well worn 225/50/R16s at the rear.

Will you have ATTESSA problems, I would say it's a 50:50, and things will only get worse as the tyres wear down. And to make things worse narrow tyres at the front will just make the understeer worse