Wheel Sizes & Offsets For Skylines

[R3N3]

On 12/7/2024 at 8:37 PM, Akira32 said:

Yep I did some more research and found this out also. Still hesitant on ordering until I find the right fitment for a stock GTR r32

A good shop should do a fitting to see what works best for your vehicle.

[Adz2332]

Anyone have pics or fitment of 18 9.5 + 22 or +30 on stock front 32 gtst guards?

[Adz2332]

On 12/01/2023 at 9:19 PM, Kinkstaah said:

www.willtheyfit.com

Very useful. Or measure. As GTSBoy said, 17x9 +30 just about lines up perfect with the outside of the guard.

10.5 +22 is 27mm beyond the guard.

When you say just about lines up at the front, how many mm could I go extra?

18 X 9 + 28, 25?

[Kinkstaah]

This was relating to R33/R34. I don't know with regards to R32's. There's probably some difference between R33/R34 and R32 that is known, but not by me :p

[GTSBoy]

R32s have skinny guards that won't swallow as much wheel sticking out from the hub face as the 33s and 34s do. The clearances on the inside are approx the same though.

[Kinkstaah]

Yeah, but... how much skinner is it? 5mm? 10mm? 

[GTSBoy]

33 minutes ago, Kinkstaah said:

Yeah, but... how much skinner is it? 5mm? 10mm? 

It seems like the later cars will swallow something at least an inch bigger than what will comfortably fit under an R32 guard. It makes sense. The R32 standard wheel width is 6.5", and I think the R34 is 7.5" (and it is isn't, it's 7). They put on a wider wheel to ensure that there wasn't a gaping gap making the car look silly.

[Akira32]

Anyone know if this will fit without modifications for a R32 GTR? 

Work S13P

[F] 18x9.5 +24 O-disk
[R] 18x9.5 +24 O-disk

[wardiz]

+22 fits very well so +24 should fit as well.

What's O-disk ?

[Akira32]

4 hours ago, wardiz said:

What's O-disk ?

It’s just the brake clearance specs for work wheels. 
 

Disk Type:
・A disk - Standard brake clearance
・O disk - Small brake clearance with deep rim
・L disk - Big caliper brake clearance
・R disk - Big caliper brake clearance
 

I’ve since found out that for R32 GTR you’ll need R-Disk to clear front brakes without spacers and rear can be O, A, or R disk. 

[PranK]

1 hour ago, Akira32 said:

It’s just the brake clearance specs for work wheels. 
Disk Type:
・A disk - Standard brake clearance
・O disk - Small brake clearance with deep rim
・L disk - Big caliper brake clearance
・R disk - Big caliper brake clearance
 

I’ve since found out that for R32 GTR you’ll need R-Disk to clear front brakes without spacers and rear can be O, A, or R disk. 

How much will they foul by?

[Akira32]

19 hours ago, PranK said:

How much will they foul by?

Sorry PranK what does that mean! This is the first time I’m buying aftermarket wheels so I’m learning all the new terminology on the go haha

[GTSBoy]

He means, "How much negative clearance is there between the back side of the wheel disc (or spokes) and the outer face of the brake caliper?"

Brake calipers can foul by being too large a diameter for the inside of the barrel, or they can hit the back of the disc area. People often ignore the latter possibility.

[PranK]

2 hours ago, GTSBoy said:

He means, "How much negative clearance is there between the back side of the wheel disc (or spokes) and the outer face of the brake caliper?"

Brake calipers can foul by being too large a diameter for the inside of the barrel, or they can hit the back of the disc area. People often ignore the latter possibility.

What he said ^

[WMDC35]

On 11/08/2024 at 10:12 PM, Akira32 said:

Anyone know if this will fit without modifications for a R32 GTR? 

Work S13P

[F] 18x9.5 +24 O-disk
[R] 18x9.5 +24 O-disk

 

On 12/08/2024 at 12:10 PM, Akira32 said:

It’s just the brake clearance specs for work wheels. 
 

Disk Type:
・A disk - Standard brake clearance
・O disk - Small brake clearance with deep rim
・L disk - Big caliper brake clearance
・R disk - Big caliper brake clearance
 

I’ve since found out that for R32 GTR you’ll need R-Disk to clear front brakes without spacers and rear can be O, A, or R disk. 

A bit late but A disk S13P fit over stock R32 GTR brakes, usually A disk front, O disk rear works.

[Black_CSR]

Hi Gents. Do u know what 18rim will fit under R32 GTST with no modification of current setup I have. I have buddy Club P1 17x8 on front and 17x9 rears and they fit well.

 

Will an 18x9 on 35 off set with 235 tyres up front fit?

ON the Rears i can run the rim size n fit 255 or 245? or i got option to get 18x9.5 on 35+ Offset n 265?

 

CHeers

[GTSBoy]

There is no difference between a 17x8 and an 18x8. The total diameter of the tyre needs to remain +/- the same (so you don't mess up the gearing, speedo reading, and clearance when turning front wheels..... so you just need to use a lower profile tyre on th 18 than you do on the 17.

/rocket surgery.

[The Bogan]

5 hours ago, GTSBoy said:

There is no difference between a 17x8 and an 18x8. The total diameter of the tyre needs to remain +/- the same (so you don't mess up the gearing, speedo reading, and clearance when turning front wheels..... so you just need to use a lower profile tyre on th 18 than you do on the 17.

/rocket surgery.

The speedo's can be very conservative, when my Mazda NC MX5 speedo is showing 118kph, the GPS, and a calibrated radar.... cop mate.....hits me at around 110kph +/- 1 or 2 kph, and that is on a 215/45 17, stock tyres size is 205/45 17 as well, so weirdly conservative with stock tyre size

When my Commodore speedo red 116kph GPS had me at 110kph on 255/40 17, so again conservative

Google says manufacturers need to set the speedo from 4 to 10% slower than actual road speed.....for safety.....and compliance 

After doing some offset and clearance measurements to see what can fit the NC on 17x8 +40, without guard rolling or rubbing anything at my current ride height, I've decided that when my tyres are toast, I'm going to fit 225/45 17 and see where that gets me IRT actual speed of my speedo and GPS/radar

From the online calculator I should be still be doing around 5kph under an actual 110kph when the speedo is showing 110kph

My ADHD requires that when I'm doing 110kph on the speedo, that the actual road speed is actually really close to that, and not alot slower

And going from 205 to 225 still keeps the car within the %/mm allowable in the NSW vehicle rules and regulations, which is nice, as long as I'm looking at the latest version that is.....LOL

https://www.nsw.gov.au/sites/default/files/2021-02/RMS-13.464-Light-vehicle-modifications-Vehicle-Standards-Information-No-6-November-2013.pdf

[GTSBoy]

19 minutes ago, The Bogan said:

Google says manufacturers need to set the speedo from 4 to 10% slower than actual road speed.....for safety.....and compliance

That's now. R chassis Skylines come from a time when the tolerance in the ADRs was a bit more....slack.

My car, on 235/35-17, which is damn near the exact same size as the original 205/55-16, is pretty much bang on correct indicated speed across the whole legal range. That's demonstrated with constant speed run over 5km, and GPS speed. It's just the luck of the draw. My particular speedo head has to be the thing that is "calibrated" that way, because everything else (the diff ratio, the gearbox and the speedo drive**) are all same same as most other Skylines.

**OK, so the speedo drive is a Navara unit to drive the R32's cable, not the electronic unit than an R33/4 would normally have with teh same gear on it.

Otherwise, I applaud your OCD tendencies, and I would do the same if I needed to.

[Black_CSR]

19 hours ago, GTSBoy said:

There is no difference between a 17x8 and an 18x8. The total diameter of the tyre needs to remain +/- the same (so you don't mess up the gearing, speedo reading, and clearance when turning front wheels..... so you just need to use a lower profile tyre on th 18 than you do on the 17.

/rocket surgery.

yeh they are 235/45/17 up front and 255/40/17 in the rears.

I still didn't get my answer if i can fit a 18x9 up front.

I want to get 4 of this and see if they will fit before committing as they didn't see an 18x8 as an option but there is a 18x9.5 also.

 

Enkei RS05-RR 18x9 35mm ET 5x114.3 75.0 Bore Matte Gunmetal Wheel

Edited August 26 by Black_CSR
adding more pictures