Gtr Tyre/wheel Size- Do They Have To Be The Same On All 4 Wheels?

[drifter 33]

hello,

im in the market for new wheels for my r33 gtr so i need a few questions answered

i prefer somethin with dish

my question is does all four wheels need to be the same size eg width

same tyre size on all four wheels?

or can i use a 18x9.5 wheel up front and 18x10.5 on the rears but with the same size tyre?

what have you guys got on your gtr's?

thankyou!

[adam-__-]

Your tyres have to be the same width because if they're not, it can stuff up your attessa. I'm not too sure on whether you can run the same width tyres on a different width rim.

[TurboX]

Adam surprised at your answer considering you own a GTS4.

The main criteria is the ROLLING DIAMETER/CIRCUMFERENCE has to be the same.

If not the AWD clutch will cook as it will be actuated slightly all the time.

Thats why in a GTR/GTS4 you know if one of your tyres is going flat.

[Slim Mat]

Agreed, pretty sure only the diameters have to be the same.

I am running 265/35R18's at the moment, not sure about rim dimensions.

The rear rims do have a different offset to my fronts, they appear more dished(stick out further) and I am not having any issues.

[Yawn]

Personally, i'd go for all 4 same sized rims.

TurboX is spot on the money.

[R31 Gagz]

I've got 255s all round but I doubt you have to have the same width, as im sure with hard cornering or lots of camber, driveway edges, etc... not all of the tyre will be on the ground at the same time. TurboX has the right of it, although I never thought about it until I read this thread...just always made sure my tyres where at correct pressures as its not good regardless to be driving around on a flat tyre.

Cheers!

Gagz

[adam-__-]

Adam surprised at your answer considering you own a GTS4.

The main criteria is the ROLLING DIAMETER/CIRCUMFERENCE has to be the same.

If not the AWD clutch will cook as it will be actuated slightly all the time.

Thats why in a GTR/GTS4 you know if one of your tyres is going flat.

I'm only 17 and haven't yet had a chance to experiment. Most of the info I give is from what I've read. My bad for giving shit information.

[drifter 33]

thanks for the reply's!

but still need to know if i can run differant wheel sizes

and by burining the attessa clutch do you mean the clutch in the gearbox?

[blind_elk]

It is highly advisable to have same size wheels and same size tyres (lost count of how many times this has been said!). It is possible to have different size tyres, but they will likely be different brand / style between front and back. There's a lot of stuffing around working out and matching rolling diameters.

Same size tyres on different width rims might have different rolling diameters.

The advantage of all rims same size is you can swap front <-> back to even out tyre wear.

The ATTESSA clutch is in the transfer case, on the side of the gearbox.

[GTR32GUS]

When i got my Gtr it had 18x8 on the front and 18x9 on the back the tyre size was 235/40 and 265/35 i had no problems with the altessa but i got understeer so i got some standard rims

[95SKY]

I have 245's on the front and 275's on the rear both x 45 never had a problem? rim size 17x9.5

Edited September 13, 2007 by 95SKY

[heller44]

As long as the larger rolling diameter is on the rear, attessa will not chuck a wobbly. If the smaller rolling diameter is on the rear it will detect it as a loss of traction and attempt to engage.

My car with new 325/45/17's on the front and worn 235/45/17's (although different brands) on the back was getting a surging both on the torque gauge and seat of the pants at highway speeds. Thats all the difference it takes.

james.

Edited September 14, 2007 by heller44

[drifter 33]

ok so if i have a 18.9.5 rim on the front with a 245 tyre and a 18x10.5 rim on the back with a 275 tyre it should be ok

correct?

[heller44]

Depends on your rolling diameter, not the width of the tyre..

Since 95sky's car is running the same sidewall percentage with wider at the back, attessa always sees the back running a bit slower than the front. No problem. It is when you do something like 245/35/18 front and 275/30/18 rear that it will be enough that it may freak.

http://www.miata.net/garage/tirecalc.html

go here and put the two tye sizes in, If the back ends up smaller in diameter than the front, you will have issues.

james.

Edited September 14, 2007 by heller44