18x8 front 18x9 rear on a 2g gsx...

[AWD Night rider]

I've been looking for a new set of wheels for my car and I just found some that I like. They are 18x8 +38 offset for the front and 18x9 +38 rear. Im also wondering if this tires would be ok for this rims 225/40/18 front 235/40/18 rear. Thanks in advance for any reply.

 

[RonRonTSI]

your tires should be the same size all the way around because you have a awd car. Its bad on the drivetrain.

 

[AWD Night rider]

That's what a friend of mine told me, but I was thinking if the 09 nissan GTR can run different size of wheels and tires how come we can't.

 

[->PrOjEcTGS<-]

They have a different drivetrain than ours. With active center diffs you can do that sort of thing. But on our cars if you have different diameter wheels/tires you're going to eat up the viscous coupler unit inside the trans. Technology has come a long way since 1990 to 2009.

 

[AWD Night rider]

So anyone have try this before on a dsm .

Is it the wider off the rear wheel what can damage your drive trian or is it something else?.

 

[knochgoon24]

No one tries it because it won't work.
Get the same width and same size tire front and back.

Out center differentials are made to lock up when the front turn faster than the back. It does this by heating a fluid between two plates. If you constantly rotate the fronts faster than the back (smaller fronts than rears) you'll bake the center differential and it will lock up. You NEED to get tires that match in size front and back.

 

[AWD Night rider]

What would be the right set of tires for this wheels so the front and rear are even?

 

[jknorr]

You won't be able to find any because the back rim is wider than the front. It would be a lot better for you to find rims that have the same width.

 

[AWD Night rider]

The reason I'm asking this is because I recently took my car to the smog check station and the guy there didn't believe me that my car was an awd because he said that the computer was showing that my car was fwd. So he put the front wheels of my car on those rollers to do the smog check and he ran it for like 10 seconds , just the front tires,then he comes out of the car and said,yes it is awd. And like I said before I've been whatching that people do it on the 09 grt's and I was like maybe I could do it to.

 

[talonalex92]

Width isn't a factor. The tires will be moving the same regardless of width if the diameter is the same. 1 inch or 10 inches wide, it doesn't matter. More of the issue would be fitting 9 inch wide wheels and tires without it looking stupid, if they would even fit at all.

 

[1gDSM4g63]

What are your means for going to 18x9 wheels? And you'll have to with 225/40/18 for 18x9 or you'll have to roll your fenders.

 

[talonalex92]

And he couldn't have ran it for ten seconds with the front wheels only moving. Much less because they run it to like 35 mph. That would probably shoot the car off the dyno immediatly.

 

[AWD Night rider]

He only ran it in first gear and he was going like 10 to 15 mph.

 

[knochgoon24]

The reason I'm asking this is because I recently took my car to the smog check station and the guy there didn't believe me that my car was an awd because he said that the computer was showing that my car was fwd. So he put the front wheels of my car on those rollers to do the smog check and he ran it for like 10 seconds , just the front tires,then he comes out of the car and said,yes it is awd. And like I said before I've been whatching that people do it on the 09 grt's and I was like maybe I could do it to.

You shouldn't have let him run it like that. All you had to do was to tell him to look at the drive shaft under that car. That makes it obvious that it's AWD.

Ok, it's not the width of the rim that's the problem it's finding a wider tire that has the same overall diameter. 225/40/18 and 235/40/18 tires are not the same diameter.

The first number is the width in mm. The second number is the profile. You get the height of the sidewall by multiplying the width by the profile (divided by 100).
225*.40 = 90mm
235*.40 = 94mm

The diameter difference ends up being more than 1/2".

 

[AWD Night rider]

I was worried after he did that to, but my car has been running ok since then. So knochgoon24 do you know what would be the right combination of tires for these rims.

 

[knochgoon24]

Your best bet would be to get 4 rims that are all the same size, then get 4 tires that are all the same size.

 

[AWD Night rider]

So what do you think of this setup 18x9 +38 offset and 235/40/18 tires?

 

[VETTE_50_TH]

First of all, how are you going to fit a 225 or even a 235 on a 9 inch rim? Thats unless you want your tire and rim to look like this.

http://a463.ac-images.myspacecdn.com/images01/51/l_fe1e4ee3f6e5ed60920db84963bd678e.jpg

James

 

[AWD Night rider]

The only thing I want is to go as wide as posible on rims without rubbing the tires even if it looks like the picture. Let me know if I can do this.

 

[zhjiln]

The reason I'm asking this is because I recently took my car to the smog check station and the guy there didn't believe me that my car was an awd because he said that the computer was showing that my car was fwd. So he put the front wheels of my car on those rollers to do the smog check and he ran it for like 10 seconds , just the front tires,then he comes out of the car and said,yes it is awd. And like I said before I've been whatching that people do it on the 09 grt's and I was like maybe I could do it to.

that mechanic is retarded...does he not see the driveshaft and the rear diff when he is checking for a catalytic converter and putting on that sniffing microphone on the muffler tip..

 

[mattdev]

You won't be able to find tires that are the EXACT same height. The middle number in tire sizes is the tire height displayed as % of tire width. So 225/50/16, the tire height is 50% of 225mm. You will not be able to find the absolute same exact height.

Also, if you COULD find the same size, there would be more rolling resistance on the wider tires, since there is more in contact with the ground, which translates to how hard your cent differential works.

Overall, just forget about it.

P.S. Many "mechanics" or "technicians" know less than you do. Do your research, and don't let them get away with stupid things, like putting your AWD car on a 2wd Roller...

 

[AWD Night rider]

that mechanic is retarded...does he not see the driveshaft and the rear diff when he is checking for a catalytic converter and putting on that sniffing microphone on the muffler tip..

He didn't even look under the car when I told him my car was AWD by the way he is pretty old and he can barely walk.

 

[zhjiln]

okay i see... well make sure next time you go smog, to point these facts out...

 

[AWD Night rider]

So what do you guys think of this setup 18x9 +38 offset wrapped in 235/40/18 on all 4 wheels.

 

[myturbo]

i dont think it will fit.unless the tires are like that pic.which can come off the rim in a corner .(very bad) i would not go wider than a 9" wide rim tire .and i have 18-7.5 rims with 225-40-18 tires (ohh they fit so good) that fit flush with the rim.and i can only maybe fit a 1/4" wider rim/tire .