GTR wheel sizes

[ricknismo]

I have heard that a lot of people use different size rims as long as the tyres are the same width...ie 18 x 8 at fron 18 x 9 at back with 245 tyres all round.. Is this OK on a GTR..I always thought the same width all round was the go.

[Guest Mashrock]

you can do whatever you like about width but size will cause problems.

[ferni]

Its rolling diam that you want the same all around other wise will cause your front torque to be on all the time. Most people with GTR's stick to same size rim/tyre all the way around.

[danh]

so whats the biggest size diameter and width you can put on a R32 GTR???

[ricknismo]

I have had 265/18's on mine no worries...lowered

[ferni]

How many GTR's do you have rick!?!?

[Ronin 09]

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.

[GTRgeoff]

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.

[MANWHORE]

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.

[ricknismo]

I have 6 GTR's...no just kidding..started with a 33 GTR, got a 32 GTR as well and now just sold the 33 and got a 34.

[ricknismo]

I think it would be better to be same than sorry and I'll stick with 9 inch wide all round

[Yorik]

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..

[Guest Mashrock]

i run 18's on the street, which are 34gtr wheels.

and 17's on the track which are 255/40/17

[pentae]

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?

[Duncan]

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?

[pentae]

Nope, torque comes on like normal.. But I havent had a chance to drive the car for an extended period of time yet (its currently garage bound while I swap my boss kit)