GT-R wheels and 18" wheels fitments

[ATLsupra]

Stock 20" GTR wheels seems to be 20x9.5 with +45 front, and 20x10.5 with +25 rear.
GTR owner tested to using 18" wheels to save cost and hopefully can have a more selective size.

[winsome]

hi do you know the off set of the silver version of the R35 wheels?

[ATLsupra]

Actually, I don't. I would assume they are similar offset for the winter wheel package.

[JeremyBlackwell]

I would love to see how much the 1/4 mile time drops with some lightweight 18" wheels. The stock 20's are very lightweight considering how large they are, but there is always room for improvement ;) Rotating mass is a killer...especially on an all wheel drive car.

[Fast GTR]

Yeah, but reports have come back showing that putting on aftermarket rims make error messages pop-up.

I'll try to find the article where it said that.

[Fast GTR]

^ Nevermind, a way was found.

[ATL-Porsche]

Yeah, but reports have come back showing that putting on aftermarket rims make error messages pop-up.

I'll try to find the article where it said that.

I'm sure they tuners will be able to get around the ECU once it's been out for a little while. I plan on keeping the stock wheels but we'll see, I always say that and always end up changing them. :D

[JeremyBlackwell]

Yeah, but reports have come back showing that putting on aftermarket rims make error messages pop-up.

I'll try to find the article where it said that.

As long as the wheels accept the tire pressure monitors there are no problems.

[AdamSupra]

hmmm... Not sure if I would do that to begin with. Just wouldn't look right to me then as they were designed for the car to be 20"... Plus, that is what Nissan picked out of hundreds of choices they tested.

[UAE-GTR]

I would love to see how much the 1/4 mile time drops with some lightweight 18" wheels. The stock 20's are very lightweight considering how large they are, but there is always room for improvement ;) Rotating mass is a killer...especially on an all wheel drive car.

yes me too love to see that

[Goodwood]

yes me too love to see that
Me 3

[Anthony]

If cost is an issue then don't buy the GTR in the 1st place . Fitting 18's is like dumming down the car. Pls leave it alone & just be grateful it wa gifted with those perfect 20's.

Anyone know if 21's will fit???

[Goodwood]

Ya, why don't you just mount those space saver tires all 'round. That'd be sweet looking, wouldn't it!? ;)
If cost is an issue then don't buy the GTR in the 1st place . Fitting 18's is like dumming down the car. Pls leave it alone & just be grateful it wa gifted with those perfect 20's.

Anyone know if 21's will fit???

[Ev0H8t3r]

They have fitted 22's on the GTR in Japan, looked like Arzzz to gheto rice, but why! its to damn heavy...20 is the biggest you should ever go, but 19 would be better....18 would be magic...

[Anthony]

whats is the big deal surronding 18's ?? Is it scientifically proven that they are the best & always will be until the end of the world dawns upon us?? Would 14's be better I'm sure they'll look quite comical & will definately be cheaper to maintain & to replace tyres those size will cost about the same as a Mc dons meal..

Good idea aye??!!

[JeremyBlackwell]

whats is the big deal surronding 18's ?? Is it scientifically proven that they are the best & always will be until the end of the world dawns upon us?? Would 14's be better I'm sure they'll look quite comical & will definately be cheaper to maintain & to replace tyres those size will cost about the same as a Mc dons meal..

Good idea aye??!!

Weight is the main reason. On an all wheel drive car, lowering each wheel's weight by 3 pounds would yield very nice gains.

The other is that a smaller overall tire diameter effectively 'lowers' your gearing, which means each gear winds out faster.

[Goodwood]

Someone once said that saving 1 lb in unsprung weight is akin to saving 4 lbs in sprung weight. But still, I think I'd be looking somewhere other than the wheels for those weight savings.

[Ev0H8t3r]

as a infantry man and sniper our saying was ounces = pounds...If you can shed weight from any source, by all means do it. The wheels are a place to save a few pounds (1-5), the hood, trunk, heck next thing you know you are anywhere from 10-15 pounds lighter! And that is just the begining...

-However it does seem many of the Tuners and wheel makers in Japan are making lighter 20's now...in a few years they will match the weight of 18's...

[Tere]

I'm really surprised 18s fit over the 15" rotors.

I've got 18s on my '03 350 with 14" rotors and the caliper clearance is about a quarter inch. Increase rotor radius by a half inch and it's a no-go for 18s. To me, the smallest you could go would be 19s.

[babibengkak]

I think that the only problem that will occur when you change to an 18" rim (or other tyre size resulting in different outer circ.) is the tyre pressure sensors. This would make an error pop up i guess, as far as i know it's a passive system, where it measures the tyre pressure using the rotation speed of each wheel. (could be wrong though)......because an active tyre pressure sensors would not require us to drive the car a couple of meters to determine the pressures.
Also the car is huge.....installing 18s would make it look like 15s.....(personal opinion). 20s fit just fine. I know 18s would shave off time in accel, but in GTR's league.....how fast do you really need it to be?

[Tere]

I think that the only problem that will occur when you change to an 18" rim (or other tyre size resulting in different outer circ.) is the tyre pressure sensors. This would make an error pop up i guess, as far as i know it's a passive system, where it measures the tyre pressure using the rotation speed of each wheel. (could be wrong though)......because an active tyre pressure sensors would not require us to drive the car a couple of meters to determine the pressures.
Also the car is huge.....installing 18s would make it look like 15s.....(personal opinion). 20s fit just fine. I know 18s would shave off time in accel, but in GTR's league.....how fast do you really need it to be?Changing wheel size presumes a change in aspect ratio to yield the same outer diameter (approximately 27.9 inches for the GT-R). Outer wheel diameter has nothing to do with the TPS system (pressure sensors transmit to antenna in the right side A pillar). Driving a short distance to clear the TPS light is just the way they set the system up to validate the clear command (presumed stabilized tire pressure sensor reading).

Actually, 19" wheels would give a better racing sidewall (since I don't see how 18" would fit), enhancing cornering contact patch. For instance the stock GT-R rears are 285/35R20 -- that is a relatively thin sidewall. I'd prefer a 285/40R19 which would give you a load bearing increase while maintaining close to the same outside diameter (28"). For the 255/40R20 fronts, a 255/45R19 is a perfect replacement (28" OD). Fundamentally, the sidewall increase both front and rear would be a half inch (4" versus 4.5").

There's fast and there's always faster. A little bit here, a little bit there, and the little bits add up. Right off the bat, I'm planning a 75-100 HP increase which will get me close to V-spec territory. But then, my hobby is tinkering with go-fast machines.

[babibengkak]

Hi Tere, thanks for the info about the TPS.

A friend of mine has 18" wheels which clears the big brembo. But i think that's about the only 18" wheel i've seen that could fit.

Anyhow, can the clutch handle the power increase? Or do we have to upgrade it as well?

[JeremyBlackwell]

Hi Tere, thanks for the info about the TPS.

A friend of mine has 18" wheels which clears the big brembo. But i think that's about the only 18" wheel i've seen that could fit.

Anyhow, can the clutch handle the power increase? Or do we have to upgrade it as well?

THe clutches are having issues at higher boost levels:
http://www.nissangtrclub.com/showthread.php?t=752

[008]

The most important part about running 18" wheels is tire selection. Do any manufacturers even make R compounds in 20s? Most of you it seems will never take this car to the track but for those of us who plan on tracking it, it would be a huge plus to have 18" wheels for the choices of R compounds.

[Anthony]

Quite right, how many GTR owners will do track?? Not many I suspect but good luck in your findings.

[ATLsupra]

Quite right, how many GTR owners will do track?? Not many I suspect but good luck in your findings.

There are plenty of guys taking their GT-R to tracks already all over the world. It's a capable car, in fact a very good one, and I am sure many of track people would like to run full potential of the car with R-compound tires. If I get one, I would take it to track. ;)

[babibengkak]

Regarding tyres,

r-compound would be the second problem. I wanted to go out on track last week, but couldn't find a matching tire size.

the closest i got was the Michelin Pilot Sport 2, 255-35 fronts and 295-30 rears.
both are thinner than the original size.

They have racing slicks in that size, but the problem is I live 2,5 hours away from the track, which makes it very dangerous if it rains (especially on the way there).

[Anthony]

Wheels - This is the one that really got my attention. During testing (when the mule still had the G35 body covering it up), the original wheels on that test car actually had torque twist to the spokes from the extreme Gs the car would pull on the Nurburgring (as much as 1.9G). The wheels on the production version are spec-ed to specifically handle this much stress. An aftermarket wheel may not and could experience similar spoke twisting or sheering under high lateral G conditions. Not sure how many aftermarket wheels are tested to ensure integrity at these levels, but I'd guess not all of them.