I am thinking ROH Drift R. 18 X 8 front and 18X9 rear.

With re040 225/40 and 245/45 respectively.
(Upgrade from 17" touring 7.5" f and 8" r)

Is the difference in width f and r recommended?
Doesnt the track have 18" all round?

Whats the best way to source the Nismo stuff?

T.I.A.
Steve

 

You'd need a 225/45 in front to maintain the proper stagger with those sizes. The 40 series may be OK but search around here first. 245 on a 9" rim? Is that within spec? Our track has 8" wheels all around with 225/45 f and 245/45 r. You may want to look at something around 265 for a 9" and use a 235 or 245 in front.

As for the Nismo stuff you're probably better off importing it yourself from Japan.

 

Best size rim for a 245 is 8.5" - here's a link to a tyre size calculator also ...

link

I got my Volk wheels through Wheel Revolution in Brisbane, and in Sydney Perfect Run had the best prices.

link

 

Sorry..my mistake on the 240 front, it is 225.

245/45 on rear is 9mm out on rolling diameter.
235 is only 1mm out , but 10mm less on road..

Why is the touring 1/2 " diff and track the same width?

Is this to do with additional traction control? Bigger calipers I wonder?

 

Great.
Thanks for replies and good tyre chart, Saved!!

I calculate 225/45 18X8 on front.
and 265/40X9 on the back......... only 1.6mm (0.4%) out..no prob.

What do you think of the ROH Drift R. It is a daily driver so going one piece and a bit tuffer. Not a money thing...,

Steve

 

The front and rear diameters are different and it's important that you stay as close as possible to this ratio as it'll effect ABS and possibly traction control if you stray too far.

EDIT: We posted at the same time. Those sizes *should* be OK.

 

When you say different...

I apply the maths to my 17 X 225/50 and 17 X 235/50
and I balance with 18 X 225/45 and 18 X 265/40 to within 1.6mm via the tyre calculater as supplied in the above post.

Does this seem ok to you?(If you have time).Or have I missed something vital?

And why the touring different width and track the same f and rear??

Steve

 

Basing my calculation on the stock Track sizes of 225/45-18 front and 245/45-18 rear there's approx a 57mm difference in circumfrence.

Your proposed sizes of 225/45-18 front and 265/40-18 rear have a difference of approx 30mm in circumfrence. this *may* be OK but is a fair way out so could just as easily be a problem, I'm not sure as it's not an issue I've looked into yet in detail.

A better choice would be a 275/40-18 rear which would give a 55mm difference which is almost the stock measurement and I'm sure would be OK.

Another possibility would be 245/40-18 in front and 265/40-18 in the rear which gives a 50mm difference which is probably still OK but obviously not as close.

I'm sure if you search around in the wheels and tyre section of the forum you'll find plenty of examples of what works.

As for the difference in width front to rear I don't think it's really important as long as the difference in circumfrence is maintained.

 

For 18s (Nismo recommendation) 18x8.5 in front with 25mm offset and 245/40 tires. Rear is 18X9.5 with 30mm offset and 275/40 tires. Hope this helps.

Lou

 

That's interesting. That gives a difference of about 75mm larger in circumfrence. Wonder if that means it's more acceptable to go larger than to go smaller or if 25mm is still within an acceptable margin.

 

No - Tire curcumfrence (we (USA) speak about the OD (outside diameter), and that is exactly the same as the stock 18s (225/45s and 245/45s) on the 8" wide rims. These sizes also maintain the proper stagger.

 

They're close but they're not the same:

Front:
225/45-18 = 2072.5mm circumfrence
245/40-18 = 2052.1mm circumfrence

Rear:
245/45-18 = 2129.1mm circumfrence
275/40-18 = 2127.5mm circumfrence

The difference between front and rear in the stock sizes is 56.6mm. With the Nismo sizes the difference is 75.4mm. As I said this may be within the acceptable range (whatever that is) but they're certainly not the same as stock.

 

asp:

It might happen to be the same as the front wheels are now 8.5" for Nismo LM GT4... so the tyre shall strach a bit... this applies to the rear as well... just my opinion!

Also many insurance companies do not allow our cars to use wider wheels... I heard that max. is to 9" only.... as I spoke to one of my friend.... he said to me that we are allow to increase our wheel diameter by 2" Max and 1" at the width by law... therefore, I guess 9" is the legal width for all of us!! And apparently those nismo rear wheels aren't "that" legal here...

Just a piece of info want to share!

cheers,

richie

 

True you will get some differences due to the width of the wheel but that's difficult to calculate as it's differ between manufacturers.

Legally you can basically go as large as you want in terms of diamater as long as the circumfrence/rolling diameter/outside diamater remains the same as the stock measurement but as you said only 1" wider (actually I think it's 20mm but close enough). You'll generally run into the width constraint way before anything else. The important thing to consider is that while it may be legal that doesn't mean the insurance company will accept it.

 

Hmmmm its all very confusing.

On 18"'s rims , I can get tyres to within about 1% of original rolling diameter of the original 17"'s on my touring, however, the overall circumference is 25mm diff from stock 18"s.

I figure I should keep it in spec with my original 17"s...

Does this make sense to you?

 

There's no reason not to go to 18" if that's what you want, you just need to be careful in tyre choice due to the ABS/TC/VDC it's more sensitive to sizing than other cars may be.

Have a look at the tyre/wheel forum here and see what sizes people are running on 18" rims then you can be sure those sizes will work OK.

 

The rear rim width of the Track rear wheel in The USA is 8.5", therefore a 9.5" wheel should be OK. That is if the 8.5" Rays are a factory option over there.

Also, apsilon is assuming that all manufacturers have an OD that is exactly the size it calls out on the side wall. That's not ture. They vary. Michelin says the Pilot Sports are 28.8" in OD for a 275/40/18 tire. Dunlop for the SP9000s and the Bridgeston for the SO3s say it's 26.7". For the 245/45 tire, all three manufacturers list the ODs as the exact same number as their 275/40s. For the 245/40s, Dunlop is 25.7", Bridgestone SO3 is 25.6" and Michelin is 25.8". Dunlop doesn't make a 225/45 tire, however the SO3 is 25.9" and Michelin is 25.8" in that size. What all this means is their really is no standard. The measurement's are close, withen .1", and therefore, IMO, the ODs with the optional wider tires are for all intents and purposes the same as the stock ODs.

Lou

 

4WSboy - for what its worth, I think the Drift R wheels look hot. The only thing I don't like about that wheel is the big R in the centre, which screams GT-R wannabe!!! I have been given an estimate of the cost by a Bridgestone tyre dealer of between $400 - $450 for 19" - good price for the looks. I have not seen the mag in the flesh yet, but if you're not far from Taren Pt, you can go to the ROH factory and check them out if you have only seen them in mags as I have.
Also, as stated above, check with your insurance company if they allow you to go to 18" (or 19") as they generally allow 1" wider wheels. If you wanted a 9" width in the rear, I would use the arguement that the optional Rays are 8" width, but you opted for the cheaper 17 x 7.5" wheels at time of purchase.
Finally, when looking for a tyre for your new wheels, you may have difficulty finding a tyre that conforms to the weight requirements of the Z (i think 96 load rating on the rear is difficult / impossible to get for under $350 / tyre and you may have to go to $500+ per corner). Good luck and let us know what you end up with.

 

I know they differ between manufacturers which complicates things but I'm just doing calculations based upon what they should be. I agree that they're close enough but your original post stated they were exactly the same.

FWIW we also don't have the availability of all the sizes you get over there which makes selection even more difficult.

As for insurance you can legally go 1" wider than the widest option however I have seen cases where a specific insurance company wouldn't even insure the OEM optional wheels on a model they weren't originally available for.

 

Thanks KY.

I got a price on 18 X 8 and 18 X 9 Drift R. with Bridgestone RE 040 245/45 and 265/30?of $2900.00 (Brookvale Bob Jane) and $2500 @ Tempe Tyres..However I'll stick with Local ...Brookvale!! over Tempe...

Other availability was Michelin Pilot and Pirelli P Zero, @ $600 odd, dunno if worth it for daily driver...

I'll cjheck out the type R centre Logo and maybe replace it with Nissan as they seem to be standard size. Anyway.what normal thinking 350 would ever wanna be a skyline ..he he.

Steve