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You might want to have a careful think about the rim width - depending on how sensitive the 4WD sensors are.

Consider this:

In an example of a 8" front rim and a 10" rear rim, and 245/45 tyres.

On the 8", the sidewalls will be more or less vertical.

On the 10" the sidewalls will be stretched - dorifto style.

Given that the sidewall height and tread width are fixed lengths, the stretched tyre will have a smaller overall rolling diameter.

…all in theory of course.

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On my GTR33 I have 275 35 18"s over what I think are 10.5" wide rims. On lock it rubs the wheel arch liners and the BOV in the right front. Not very keen on that but what do you replace TE37's of that size with?

With the sizes, a calculator should help with rolling circumference, I think duncan has one.

Something like what Rick said above would be fine as the wal would only be offset a small amount.

On the GTSt I use 235 front and 255 rear on the same size rims.

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Ronin, what you said is correct, BUT I do not believe that is what mashrock and ferni were referring to.

I think what they meant was as an example 235 45 r 17 on an 8 " wheel on the front and 255 40 r 17 on a 9 " wheel at the back.

In this example, both tyres have the same profile, but different width. Furthermore, the sidewalls are relatively the same.

In this example, this would work fine.

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Here is a link to a calculator... http://www.yorik.biz/gtr/tyresizer.zip

Basically try and keep the tyres the same and rim width close. I run 245/45/17's on my 8" and 9" Work rims for fun stuff, but for more serious I run 255's all round on my 9" AVS rims.. I am considering dropping 255's on the Work rims just to make it a bit closer.. of course if you are concerned about the 4WD factor, you can always disable it for longer drives..

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  • 3 weeks later...

Hmm, Today I picked up a set of 245/50/16's for the rears (as opposed to the 245/45/16's) because they had about 90% tread left on them and only cost me $60 ;)

the fronts are unchanged at 245/45/16s.. the 4wd light hasnt come on yet, but the rears feel a bit nervous when cornering hard.. Will this cause problems with ATTESA?

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Interesting....are you getting front torque regularly? I'm not sure of the exact diameter difference that causes problems so that will be interesting.

Also remember the main input to atessa is the g sensors so maybe they need to register that you are giving it a bit first ;)

BTW for those that want to run different sizes front to rear, why? there's plenty of room under the front guards, 265s should fit with the right offset wheels, and then you don't have to worry about the different sizes?

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