Jump to content
SAU Community

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

drifter 33
 Share

Recommended Posts

drifter 33 Proficient

drifter 33

Posted
Posted

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-__- Grand Master

adam-__-

Posted
Posted

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 Mentor

TurboX

Posted
Posted

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 Collaborator

Slim Mat

Posted
Posted

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.

R31 Gagz Collaborator

R31 Gagz

Posted
Posted

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-__- Grand Master

adam-__-

Posted
Posted
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. :rofl: Most of the info I give is from what I've read. My bad for giving shit information. :wacko:

blind_elk Grand Master

blind_elk

Posted
Posted

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.

heller44 Mentor

heller44

Posted
Posted (edited)

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 by heller44
heller44 Mentor

heller44

Posted
Posted (edited)

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 by heller44

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • GabsReDeal
      R32 GTS (RB20DE) Injectors Replacement

      By GabsReDeal · Posted

      I refreshed the OEM injectors with the kit and connected it up. It now ideals okay even with the IACV removed. Driving still has the same cutoff issue like the 550cc injectors so the issue is somewhere else. I bought FPG's Fuel Pump Hanger. I will be installing it next, but it is not as straightforward as I thought it was with my limited wiring knowledge and no instruction on the specific model I purchased (FPG-089). I also got the incorrect billet clamp as I could not find info on the OEM sizing.
    • MBS206
      Leaking Rear Subframe Bushing?

      By MBS206 · Posted

      Stop looking at the garage floor, and turn the radio up a bit louder if there's any strange noises...
    • GTSBoy
      Unknown sound similar to BOV on positive boost with partial throttle RB26

      By GTSBoy · Posted

      No. Turbo shuffle and surge/flutter are not the same thing. Specifically, on a GTR, turbo shuffle has a definite meaning. On a GTR, the twin turbos are assumed to be the same thing and to operate the same way, exactly. In reality, they do not. Their exhaust sides are fed and exhaust a little differently, to each other. Their inlet sides are fed and exhausted a little differently, to each other. Consequently, when they are "working" they are often at slightly different points on the compressor map compared to each other. What this means, particularly when coming on boost, is that one of them will spool up and start producing extra flow compared to the other, which will put back pressure on that other compressor, which will push the operating point on that other compressor up (vertically). This will generally result in it bumping up against the surge line on the map, but even if it doesn't, it upsets the compressor and you get this surging shuffle back and forth between them That is "turbo shuffle" on a GTR. It is related to other flutter effects heard on other turbo systems, but it is a particular feature of the somewhat crappy outlet piping arrangement on RB26s. There are plenty of mods that have been attempted with varying levels of success. People have ground out and/or welded more material into the twin turbo pipe to try to prevent it. Extending the divider inside it works, removing material doesn't. There are aftermarket replacement twin turbo pipes available, and these exist pretty mush purely because of this shuffle problem.
    • Duncan
      Leaking Rear Subframe Bushing?

      By Duncan · Posted

      You can temporarily* use lock collars to keep it in place until you can do the bushes, back the nuts off, slide them in, snug back up. *temporarily is often for ever
    • nouveau_poor
      Unknown sound similar to BOV on positive boost with partial throttle RB26

      By nouveau_poor · Posted

      Thanks for the quick reply. To be clear, when you say turbo shuffle do you mean turbo flutter "stustustu" or referring to something else? I had thought they were the same thing. When I wrote the post my intention was to say it wasn't a flutter/compression surge sound. My understanding was that a flutter sound would be occurring when throttle is released, whereas I can keep the throttle in the same position for this noise
×
×
  • Create New...