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Quick Question About Gtrs And Gts4s

WYTSKY
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WYTSKY Veteran

WYTSKY

Posted
Posted

hey guys...I know there are a number of similar topics like this on the forums, but I am interested in getting a set of wheels... I just wanted to know if gts4's or gtrs can have rims with staggered widths.... i.e 17*9 in the front and 17*10 in the back and not wear out the 4wd system?

I have seen pics with gtrs having some skinny rims on the front and massive 

deep dish rims on the rear... I thought the 4wd computer would constantly bring torque to the front wheels because of different widths and weights and eventually your 4wd system will wear out.

Something I am curious about just due to the amount of rims that come through th

se 

forum but they are mostly thinner in the front then the rear....

And just for the record I don't want to make mine a 2wd to use different width rims...

Thanks,

Adam

P.S sorry admins if this is the wrong section... didn't think it counted as a tyre or suspension problem...

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CeJay Grand Master

CeJay

Posted
Posted

I've got 9's on the rear, 8.5's on the front, no probs with the attessa system, but my front and rear tyres are the same profile 235/45's. I think the important thing is getting the rolling diameters of both basically the same.

Potenza Apprentice

Potenza

Posted
Posted (edited)

Depends on profile. Easiest way to get an approx value is:

235/45R17

(235 x .45)x 2) + (25.4 x 17) = 643 mm Overall diameter. Pi x D = circumference. 643 x 3.14 = 2019 mm

Please note these are approx and will vary between Brand & pattern.

Edited by Potenza
heller44 Mentor

heller44

Posted
Posted
...

Please note these are approx and will vary between Brand & pattern.

Believe this as well. I had 235/45/17's all round on the same size rims, fronts were new, backs were old, different brands. Still made the 4wd freak.

WYTSKY Veteran

WYTSKY

Posted
  • Author
Posted

crap.... so when you say freak... like the steering wheel was constantly really tight?... i.e lots of torque being moved to the front?

I heard some people make their tires a tiny bit bigger or smaller on either the front or the back to give a good constant amount of awd traction..because it is tricking the system....

I have no problem if the 4wd system is always on... but ONLY if it wont wear it out faster then normal... because some people say there is always a little bit of torque going to the front... in which case im sure i'd be ok if i get staggered wheels because the 4wd system is on permanently anyway...

but I have also heard a lot of comments that it will only kick in "when neccessary" in which case i believe the system would wear out quicker if it is not permanently meant to be on...

someone must have the dead set answer?

Adam

blind_elk Grand Master

blind_elk

Posted
Posted
I've got 9's on the rear, 8.5's on the front, no probs with the attessa system, but my front and rear tyres are the same profile 235/45's. I think the important thing is getting the rolling diameters of both basically the same.
Doesn't matter that the tyres are the same size. Being on different width rims, they will have slightly different rolling diameters.

The rolling diameter for a given tyre (manufacture / width / profile) is based on a particular sized rim. And different manufacturers use different sized rims as the "standard" for the same size tyre. when you move away from the "standard" rim ie widr / narrower), triangulation changes the effective sidewall height, so the "effective" profile changes, and the rolling diameter changes.

As has been said too many times - SAME SIZE TYRE ON SAME SIZE RIM ON EVERY CORNER.

CeJay Grand Master

CeJay

Posted
Posted
Doesn't matter that the tyres are the same size. Being on different width rims, they will have slightly different rolling diameters.

The rolling diameter for a given tyre (manufacture / width / profile) is based on a particular sized rim. And different manufacturers use different sized rims as the "standard" for the same size tyre. when you move away from the "standard" rim ie widr / narrower), triangulation changes the effective sidewall height, so the "effective" profile changes, and the rolling diameter changes.

As has been said too many times - SAME SIZE TYRE ON SAME SIZE RIM ON EVERY CORNER.

Meh you have a link to calculate the difference? As I would be interested. it makes sense, but it's the first i've heard of it. Even the tyre place down here steered me wrong with these rims I was running. specifically asked if the higher profile tyres on my rear rims would affect the attessa the rolling diameters difference was about 5mm they said no. and of course as soon as I left my attessa played up. After switching to my old tyres, with the same profile it settled down back to normal.

Although on the 32 the 4wd system is only part time, it doesn't constantly deliver a portion of torque to the front, which I think the 33 does. Incidently found out on checking again, my front rims are 8 inches and my backs are 9's, and the attessa system works as before when I had 9 inch rims all round.

heller44 Mentor

heller44

Posted
Posted
crap.... so when you say freak... like the steering wheel was constantly really tight?... i.e lots of torque being moved to the front?

I heard some people make their tires a tiny bit bigger or smaller on either the front or the back to give a good constant amount of awd traction..because it is tricking the system....

I have no problem if the 4wd system is always on... but ONLY if it wont wear it out faster then normal... because some people say there is always a little bit of torque going to the front... in which case im sure i'd be ok if i get staggered wheels because the 4wd system is on permanently anyway...

but I have also heard a lot of comments that it will only kick in "when neccessary" in which case i believe the system would wear out quicker if it is not permanently meant to be on...

someone must have the dead set answer?

Adam

Freak = a very pronounced surgeing, both on the gauge, and through the backside. I can't imagine it being that much fun for the transfer case either.

I thought it might have been a fuel prob, but pulled the 4wd fuse and it went away. Swapped rims front to back and put fuse back in and it was all good.

godzl1975 Experienced

godzl1975

Posted
Posted
Thats wot I was afraid of hearing... so GTRs that have staggered width rims... wots the go with that?

its ok to have staggered widths as long as the tyres rolling diameter is the same or have slightly larger at the rears (dont know if reaction times of attessa is affected)can be used.

Ideal is to have same widths of rims with same tyres all 4 round. if u need to rotate rims front to back wont be a problem as with staggered rims doing the same thing, in cases of rears tyres wearing out faster than fronts.

GTR32GUS Mentor

GTR32GUS

Posted
Posted

When i got my gtr it had staggered widths and the altessa worked fine , but when u were full into it the front wheels lost grip before the rear which annoyed me , now i got the same size rubber on all 4 corners and now when u lose grip the car slide nice and even , i think having staggered rim threw the balance of the car out

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