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Need Help From Expert On R34 Gtt 2dr Wheels And Offsets

chak8080

By chak8080,
in Exterior & Interior Styling

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chak8080 Collaborator

chak8080

Posted
Posted

I need some help figuring this out.

I have the R34 GTT vented fenders and they are 20mm wider than normal. I'm trying to order the Racing Hart CXR's.

Front 19x8.5

Rear 19x9.5

On the racing hart website it says the offsets for a R34 25GTT are...

Front 18x8.0 +35

Rear 18x9.0 +38

I have no idea if that means they are flush or not.

I'm looking to have my rims fitted flush with the guards... so what offsets should I use if I'm going 19 inch rims 8.5's and 9.5's? Any help would be appreciated. Thanks!

adam-__- Grand Master

adam-__-

Posted
Posted

Hey mate, try using this calculator:

http://www.1010tires.com/WheelOffsetCalculator.asp

Type in your current wheels, after market wheels and you'll see how much more/less they stick in/out. Just keep playing till you get something you like then go out hunting for them wheels! :)

Good luck with your search, anymore questions, feel free to ask.

chak8080 Collaborator

chak8080

Posted
  • Author
Posted (edited)
Hey mate, try using this calculator:

http://www.1010tires.com/WheelOffsetCalculator.asp

Type in your current wheels, after market wheels and you'll see how much more/less they stick in/out. Just keep playing till you get something you like then go out hunting for them wheels! :worship:

Good luck with your search, anymore questions, feel free to ask.

Thanks adam but I've seen that before. I can't use it because I don't know what the specs are for stock R34 GTT rims and the stock GTT rims don't sit flush. Also, I'm getting new front vented fenders that are 20mm wider than stock. Does that mean I subtract 20mm from the front offset? For example, if my front was 19x8.5 and offset was +30 with the stock fenders then I would need to find +10 offset rims if I get the vented fenders. I don't know how that works.... do I need 225 on the front to make clearance or will 235's or 245's be ok? Would 265's be alright for the rear on 9.5's?

Edited by chak8080
adam-__- Grand Master

adam-__-

Posted
Posted

Lets just say your standard wheels are 6.5" wide and have an offset of +40 (not sure what they really are, but just going with standard r32 wheels). At the moment they are IN the standard guards by lets say 20mm. To have the wheels flush with the standard guard, you'll need wheels which are 6.5" wide and with an offset of +20, 8" wide with an offset of +39, etc. But since you're having the wider guards, you'll need 6.5" with a 0 offset for them to be flush, 8" wide with a +19, etc.

Remember that this is for your wheels themselves to be flush, with the guards, not tyres. Having tyres will make the 'package' stick out a little more if you're not planning on stretching some tyres.

Hope that helps... at least a bit. haha

chak8080 Collaborator

chak8080

Posted
  • Author
Posted (edited)
Lets just say your standard wheels are 6.5" wide and have an offset of +40 (not sure what they really are, but just going with standard r32 wheels). At the moment they are IN the standard guards by lets say 20mm. To have the wheels flush with the standard guard, you'll need wheels which are 6.5" wide and with an offset of +20, 8" wide with an offset of +39, etc. But since you're having the wider guards, you'll need 6.5" with a 0 offset for them to be flush, 8" wide with a +19, etc.

Remember that this is for your wheels themselves to be flush, with the guards, not tyres. Having tyres will make the 'package' stick out a little more if you're not planning on stretching some tyres.

Hope that helps... at least a bit. haha

Ok, so what your saying is that an increase of 1.5 inch on the width of the rim equates to +19mm (38mm/2)?.. in respect to that an increase of 0.5 inch would equate to +6mm (12mm or 13mm/2)?

I read somewhere on SAU that says the following is the best set up for a R34 GTT(i don't know if this is for a 2Dr or 4Dr).. Rims sit flush..

Front 8.5 +32 offset 225 tires

Rear 9.5 +38/35 offset 265 tires

If that's the case then I can use this as a base. Since my front fenders are going to be 20mm wider would this be right..

Front 8.5 +12 offset 225 tires or 9.0 +18 offset 225 tires

Rear 9.5 +35 offset 265 tires

Would that make the front flush again?

Does anyone have a ER34 GTT 2Dr that's running 19x8.5 19x9.5?

Edited by chak8080
nuffsaid Veteran

nuffsaid

Posted
Posted
I need some help figuring this out.

I have the R34 GTT vented fenders and they are 20mm wider than normal. I'm trying to order the Racing Hart CXR's.

Front 19x8.5

Rear 19x9.5

On the racing hart website it says the offsets for a R34 25GTT are...

Front 18x8.0 +35

Rear 18x9.0 +38

I have no idea if that means they are flush or not.

I'm looking to have my rims fitted flush with the guards... so what offsets should I use if I'm going 19 inch rims 8.5's and 9.5's? Any help would be appreciated. Thanks!

To match 18x9.5 +38, you will probably then need 18*9 +12 with those extended guards to sit flush?

adam-__- Grand Master

adam-__-

Posted
Posted
Ok, so what your saying is that an increase of 1.5 inch on the width of the rim equates to +19mm (38mm/2)?.. in respect to that an increase of 0.5 inch would equate to +6mm (12mm or 13mm/2)?

I read somewhere on SAU that says the following is the best set up for a R34 GTT(i don't know if this is for a 2Dr or 4Dr).. Rims sit flush..

Front 8.5 +32 offset 225 tires

Rear 9.5 +38/35 offset 265 tires

If that's the case then I can use this as a base. Since my front fenders are going to be 20mm wider would this be right..

Front 8.5 +12 offset 225 tires or 9.0 +18 offset 225 tires

Rear 9.5 +35 offset 265 tires

Would that make the front flush again?

Does anyone have a ER34 GTT 2Dr that's running 19x8.5 19x9.5?

Yes, as far as I know, that should be correct.

adam-__- Grand Master

adam-__-

Posted
Posted
To match 18x9.5 +38, you will probably then need 18*9 +12 with those extended guards to sit flush?

18x9.5 with +38 will sit in the same position as the 18x9's with +12.

chak8080 Collaborator

chak8080

Posted
  • Author
Posted
i dont have 19s but ive got weds 17 with 9 front, 9.5 rear, and +35 offset allround, and they look shmick and tucked nice under the

guards

Do you have any pics?

chak8080 Collaborator

chak8080

Posted
  • Author
Posted (edited)
Yes, as far as I know, that should be correct.

Ok, I thought I had it but now it's getting confusing... If I go off of Racing Harts website it should come out to this..

Front 18x8.0 +35 to 19x8.5 +29 (-6mm for 0.5 increase in rim width) to 19x8.5 +9 (-20mm to bring the dish out to fit flush with the 20mm wider fenders)

Rear 18x9.0 +38 to 19x9.5 +32 (-6mm for 0.5 increase in rim width)

Should I leave like 3mm or so clearance to maintain my turning ability? I want my tires to be slightly tucked so the rims don't hav eto sit perfectly flush... just flush enough where it looks 'full'.

jesus... I never knew sizing rims could be this difficult. It would be nice if they sold my PCD here in Korea so I can do test fits... but since I can't I don't want to waste money sending rims to and from Japan until I get the right fitment... these rims are expensive enough!

Does anyone know the stock setup for a 2Dr R34 GTT? I think the rims are 17x7.0 all around and +30/35 offset all around?? Someone correct me please.

Edited by chak8080
adam-__- Grand Master

adam-__-

Posted
Posted

I agree, wheels are expensive and you want to do it right the first time.

With the troubles turning, it would really depend on how low your car is and how stiff your suspension is.

'Flush' for you could mean tucked for me. Can you get a picture of where you would like your wheels to sit? Cause when I say 'flush' I'm thinking...

post-32186-1201765940_thumb.jpg post-32186-1201765960_thumb.jpg

n15m0 Grand Master

n15m0

Posted
Posted

R34GTT standard wheel specs are 17x7.5 +40

Use that as a base when using the wheel offset calculator.

2dr and 4dr use the same specs. I have run 8.5 and 9.5 +35 all round and still have a bit more room to move...say 5-10mm

If you are running wider guards +20mm then subtract that from what is recommended...I would personally be a bit more conservative and maybe subtract 15mm instead of 20mm...

With those guards you should be able to run 350z or even GTR offsets (have nice dish!)...approximately

8.5 +15

9.5 +20

Best to get your guards on first so you can measure how much room you have to play with based on the wheels you have on now...

If you need some ideas of suitable offsets for stock guards, have a look at my collection >_< Click on the archived months as well.

http://www.n15m0.blogspot.com

chak8080 Collaborator

chak8080

Posted
  • Author
Posted
R34GTT standard wheel specs are 17x7.5 +40

Use that as a base when using the wheel offset calculator.

2dr and 4dr use the same specs. I have run 8.5 and 9.5 +35 all round and still have a bit more room to move...say 5-10mm

If you are running wider guards +20mm then subtract that from what is recommended...I would personally be a bit more conservative and maybe subtract 15mm instead of 20mm...

With those guards you should be able to run 350z or even GTR offsets (have nice dish!)...approximately

8.5 +15

9.5 +20

Best to get your guards on first so you can measure how much room you have to play with based on the wheels you have on now...

If you need some ideas of suitable offsets for stock guards, have a look at my collection :D Click on the archived months as well.

http://www.n15m0.blogspot.com

Hey thanks n15m0! Thats what I was looking for.

chak8080 Collaborator

chak8080

Posted
  • Author
Posted
I agree, wheels are expensive and you want to do it right the first time.

With the troubles turning, it would really depend on how low your car is and how stiff your suspension is.

'Flush' for you could mean tucked for me. Can you get a picture of where you would like your wheels to sit? Cause when I say 'flush' I'm thinking...

post-32186-1201765940_thumb.jpg post-32186-1201765960_thumb.jpg

Nice! That's what I mean by flush too butI don't know if I'll rub or not from getting the wrong tire size. I don't want to strech them too much. So either I'll go with the strech or I'll just have the rims tucked a bit more.

chak8080 Collaborator

chak8080

Posted
  • Author
Posted

Ok guys, this is what I'm going with.

Racing Hart Type CXR

Front 19x8.5 High Disk +21

Rear 19x9.5 Low Disk +35

It won't sit exactaly flush but good enough I guess....

Now tyres... I'm was looking at either the Eagle F1 GS D3's or the Falken FK452's. Front would be 225 or 235 and rear would be 265. Does anyone know if the tyre sizes will conflict with what rims size's I'm getting? I don't want to do any modifications, no rubbing either. I don't want my GTT to sit high like a 4WD car... just low enough to make clearance on the tyres so there'll be no rubbing. Any thoughts?

adam-__- Grand Master

adam-__-

Posted
Posted

Are those wheels for the wider guards as well? The offset seems pretty high? Sorry, but I'm not all that familiar with skyline guards.

What I usually do for fitment and tyres is, make the wheels flush with the guards and get tyres that are about the same width. So an 8.5" wheel measures 215.9, but closes will be 215mm tyre for example. Not sure how good this will be for performance and that, but yeah...

chak8080 Collaborator

chak8080

Posted
  • Author
Posted
Are those wheels for the wider guards as well? The offset seems pretty high? Sorry, but I'm not all that familiar with skyline guards.

What I usually do for fitment and tyres is, make the wheels flush with the guards and get tyres that are about the same width. So an 8.5" wheel measures 215.9, but closes will be 215mm tyre for example. Not sure how good this will be for performance and that, but yeah...

Yep, I went with Racing Harts measurments for a R34 GTT... Front 18x8.0 +35 Rear 18x9.0 +38. I then calculated the front... being 19x8.5 +21 offset will give me 8mm more on the inner clearance and 20mm more on the outter. The Rear I chose 19x9.5 +35. That'll give me 3mm less clearance on the inner rear wheels and it'll extend the dish 9mm more. So far, I've found a lot of GTT owners using +35 offset for the rears and had no problems.

now I just want to figure out the right tire sizes without having to sacrifice performance or having to mod guards or having this rub. 215's would most likely make a loss in performance... I think I'll jsut go with 225 in the front. The rear is either 265 or 255. Racing Hart suggested 255 on a 18x9.0 so 265 on a 19x9.5 might work out.

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