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Ultimate wheel and tire thread?


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#21 NWapache Posted 01 August 2011 - 01:31 PM

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 descartesfool, on Jul 29 2011, 10:25 AM, said:

If you want to run R compounds and keep tire costs down, just run Nitto NT-01's in 275/40/18 size on some Enkei GTC-01 wheels in 18x10-22mm offset size. Tires can be had for $275 each or so with free shipping. Works great for me, and you can just move the wheels and tires around for wear equalization,  and flip them on the rims if you have to, but I haven't found that to be necessary on my car. You can carry all four wheels in the car to the track events. One in each of the 3 seats and one in the trunk, with room for jack and other gear. That way my run-flats last a very long time, work in the rain, and are drivable in case of a puncture.

Pulled this from a different thread... Thanks descartesfool


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#22 QueueCumber Posted 05 August 2011 - 12:07 AM

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Quote

These fit my OEM suspension 2010MY w/no rubbing issues:

19X9.5 5-114 ET22 Volk TE37 W/ Michelin Pilot Sport Cup 265/35R19
19X10.5 5-114 ET22 Volk TE37 W/ Michelin Pilot Sport Cup 305/30R19

These Hoosier R6's mounted on above wheels also fit OEM suspension 2010MY w/no rubbing issues:

F: 265/35ZR19 Hoosier R6
R: 295/30ZR19 Hoosier R6

Probably the most irritating thing about 19" wheels is that it throws off the speedometer off by @8-9%. This also means the odometer is ticking off miles 8-9% faster than it should be.

On the new set coming my way, I decided to do the same as Forged Performance by going 295/30 19 in front and 305/30 19 in rear. The 305s are a 102Y rating and will give me a little more rubber... but at a cost (the 305s are $90/tire more expensive).

Sean,

Is there a way to set up the 19" Hoosier R6s so that they do not throw off the odometer and speedometer?

Can you list the complete setup specifications that would be optimal for the 19" Hoosier R6s?

Edited by QueueCumber, 05 August 2011 - 12:09 AM.




#23 seanm Posted 05 August 2011 - 09:27 AM

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 QueueCumber, on Aug 4 2011, 11:07 PM, said:

Sean,

Is there a way to set up the 19" Hoosier R6s so that they do not throw off the odometer and speedometer?

Can you list the complete setup specifications that would be optimal for the 19" Hoosier R6s?

Its all about tire height.  Stock height. A shorter or taller tire throws off the speedo.

255/40/20 Front  28 diameter
285/35/20 Rear  27.9 diameter

So stick to a tire around 28 inches tall, and you are fine

For an R6, I wouldn't consider it to be too big of a deal, as an R6 is not a street tire. Its a tire that's life is measured in hours, not miles.  You are not going to be cruising around on it.

http://www.hoosiertire.com/rrtire.htm

Closest, without going over would be the P295/35ZR19 - 27.2 inches tall. They also have a 315/40/19 which is 28.9 tall, but you might have some clearance issues.


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#24 QueueCumber Posted 05 August 2011 - 02:00 PM

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 seanm@stillen.com, on Aug 5 2011, 11:27 AM, said:

Its all about tire height.  Stock height. A shorter or taller tire throws off the speedo.

255/40/20 Front  28” diameter
285/35/20 Rear  27.9” diameter

So stick to a tire around 28 inches tall, and you are fine

For an R6, I wouldn't consider it to be too big of a deal, as an R6 is not a street tire. Its a tire that's life is measured in hours, not miles.  You are not going to be cruising around on it.

http://www.hoosiertire.com/rrtire.htm

Closest, without going over would be the P295/35ZR19 - 27.2 inches tall. They also have a 315/40/19 which is 28.9 tall, but you might have some clearance issues.

What would you recommend for higher performance than the 20" stock tires but for the 19" wheels, but with street durability as well? R888s? Or, can I get stickier than that?

It sounds like 19" is the way for me to go, because I will have the options of some track wheels like the R6s but also a good selection of road performance and endurance wheels.

Do you think the 20" will eventually have a much larger selection and perhaps I should just wait it out for now until more tires are released to cover the entire spectrum? I guess I'm also wondering if you can only get a tire so soft at 20" size before it becomes unstable or something. Thus I'm wondering if there is only so much of the spectrum they can cover as they go up in tire size.

Thanks.

Edited by QueueCumber, 05 August 2011 - 02:13 PM.




#25 seanm Posted 05 August 2011 - 03:10 PM

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 QueueCumber, on Aug 5 2011, 01:00 PM, said:

What would you recommend for higher performance than the 20" stock tires but for the 19" wheels, but with street durability as well? R888s? Or, can I get stickier than that?

It sounds like 19" is the way for me to go, because I will have the options of some track wheels like the R6s but also a good selection of road performance and endurance wheels.

The stock 20"  Dunlop Sport Maxx- the new one- are a pretty quick tire.  

I have some experience with the R888 and the NTO1 as a tire on a race car, and they both work out well. They are a streeable tire.  You have to pay attention to the -able.  They are closer to a real street tire though, than say a BFG R1, or a Hoosier.   The R1 and the Hoosier are a DOT tire, but you would never realistically expect to drive them on the street for anything more than a straight line shot to the track.

Instead of as much about the compound or quickness, I would look more into the widths.  Look at the Top Speed car from One Lap. They were on a 300 treadwear Michelin PSS tire, but in a huge size.

More width= more heat capacity. More heat capacity means you can run longer before you overheat them. It means they will last you longer because you are operating them in a range where they are happy.

And that gets me back to running a square setup.

Edited by seanm@stillen.com, 05 August 2011 - 03:10 PM.



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#26 NWapache Posted 07 August 2011 - 09:33 PM

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 spdbydesign, on Aug 5 2011, 07:52 PM, said:

I'm only going off what John (owner of CCW Wheels) told me today on the phone. He said he's done this setup for a customer's GTR, so I have no reason to doubt his story. (He mentioned the photos being listed on his website in the gallery section.)

I'm debating just  ordering Michelin PS2's in 255/40/20 PS2's for my front factory wheels and 295/35/20's for the rear. These are both 28" tall, and should be perfect for factory sized replacements.

I've been looking at tire combinations, but think that may actually be the best replacement in a non-flat for the factory wheels.

I may even match the 255/40/20 PS2 with a 295/35/20 Pilot Super Sport (released this week by Michelin, Finally!)  on the rear. I'm sure the 255/40 Super Sport will not be too far behind.


Tire Size Comparison

Specification  Sidewall  Radius  Diameter  Circumference  Revs/Mile  Difference
255/40-20         4.01in  14.0in    28.03in         88.05in        719        0.0%
295/35-20         4.06in  14.1in    28.12in         88.34in        717        0.4%


 shawnhayes, on Aug 6 2011, 07:28 AM, said:

Just of note, the computer systems, as far as anybody can tell, do not care how BIG or SMALL the tires are but whether they are DIFFERENT front to back. Trying to match sizes has been a pain. If you find a tire that fits both front and back rims, so long as they rotate at the same speed on the road, you do not HAVE to have a smaller front than back. I have noticed people turning backflips to match a bigger rear to a smaller front on outer diameter, but if you are willing to try different sizes and non-runflats, have no fear about running the same tire front and back if it will fit both rims.

The resulting "square" setup will help dial out some of the understeer, so if you have changed the suspension significantly from stock, be aware, but even with aftermarket sways (whitelines and Forged), with VDC on I have had zero (nada, nein, zippo) problems with a square setup. There are several choices in this tire that could be used "square" on stock rims, and aftermarket similar sizes and offsets.

So, just so nobody was afraid of these tires because their outer diameter isn't "perfect". Thought I had to pipe up on this. The GT-R doesn't check the GPS speed vs. indicated speedometer speed (the only way it could know the outer diameter was off).

Because, honestly, descatesfool and I have owned OCEANS of tires over time, and to both of us, these look frickin' AWESOME as a hybrid street/track tire.

Shawn



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#27 zff Posted 11 August 2011 - 05:38 PM

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Hopefully, this can  help someone here.  Here's a list of 20" tire sizes that fall within 2" of the GT-R's stock tire outer diameter.  I used every width from 255 to 315

First, the list sorted by tire widths.  Tire outer diameter is in parenthesis.
255/35-20 (27.03")
255/40-20 (28.03") (stock front)
255/45-20 (29.04")
265/30-20 (26.26")
265/35-20 (27.30")
265/40-20 (28.35")
265/45-20 (29.39")
275/30-20 (26.50")
275/35-20 (27.58")
275/40-20 (28.66")
275/45-20 (29.74")
285/30-20 (26.73")
285/35-20 (27.85") (stock rear)
285/40-20 (28.98")
295/30-20 (26.97")
295/35-20 (28.13")
295/40-20 (29.29")
305/25-20 (26.00")
305/30-20 (27.20")
305/35-20 (28.41")
305/40-20 (29.61")
315/25-20 (26.20")
315/30-20 (27.44")
315/35-20 (28.68")
315/40-20 (29.92")

According to this thread, you want to keep the outer diameter of the fronts and rears to within 0.5" of each other, so here is the same list sorted by tire diameter.
305/25-20 (26.00")
255/30-20 (26.02")
315/25-20 (26.20")
265/30-20 (26.26")
275/30-20 (26.50")
285/30-20 (26.73")
295/30-20 (26.97")
255/35-20 (27.03")
305/30-20 (27.20")
265/35-20 (27.30")
315/30-20 (27.44")
275/35-20 (27.58")
285/35-20 (27.85") (stock rear)
255/40-20 (28.03") (stock front)
295/35-20 (28.13")
265/40-20 (28.35")
305/35-20 (28.41")
275/40-20 (28.66")
315/35-20 (28.68")
285/40-20 (28.98")
255/45-20 (29.04")
295/40-20 (29.29")
265/45-20 (29.39")
305/40-20 (29.61")
275/45-20 (29.74")
315/40-20 (29.92")


Whether or not anyone actually makes tires in these sizes, I don't know.  I just did up this spreadsheet for myself and thought I'd share the results with other GT-R owners.



#28 NWapache Posted 11 August 2011 - 11:00 PM

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Thanks zff


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Best 1/4 to date 11.2@123 mid boost tune 92 octane

#29 Meddler Posted 27 August 2011 - 01:21 PM

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I'm looking for a spare set of GTR track wheels for my 2012. What I don't know is if the factory offsets are different between a 2010 and 2012 and if the factory offsets are optimal for the track. As I'm sure you've experienced, the car likes to understeer. Does Hoosier make tires for 20" wheels that are affordable?

 roketman, on Jul 22 2011, 02:12 PM, said:

In my opinion anything you can get Hoosiers on would be awesome.My only concern is Tire wear due to the weight of the Gtr .
I track my car and must say the dunlop sport maxi tires are very, very good.I did product testing for Hoosier and absolutely swear by them .Im sure 18's or 19 inch rims would fit the Gtr with hoosiers ,depending on what sizes and diameters are available.
If anyone is interested I have a set of perfect 2010 gtr rims with toyo 888 for sale.PM me if interested




#30 monEmakindave Posted 27 August 2011 - 02:57 PM

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Lot of valuable info here.  Subscribed


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#31 mistacheese Posted 30 August 2011 - 08:46 AM

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Subscribed for more info, thank you to all who took time to make this easier for the rest of us.

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#32 Spokes Posted 14 September 2011 - 09:51 AM

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Let me take this question here, is anyone running a 295/35/20 square set up with stock suspension/rims? I'm looking at the Michelin Pilot Super Sport tires, the section width is 11.9in measured on a 10.5in rim, with a dia of 28.1in...I may just go with a 285/30/20 set up.


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#33 seanm Posted 14 September 2011 - 10:03 AM

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 Spokes, on 14 September 2011 - 09:51 AM, said:

Let me take this question here, is anyone running a 295/35/20 square set up with stock suspension/rims? I'm looking at the Michelin Pilot Super Sport tires, the section width is 11.9in measured on a 10.5in rim, with a dia of 28.1in...I may just go with a 285/30/20 set up.

The stock wheel is a 9.5" in the front.   The 285/35/20 stock Dunlop looks ok. Sidewalls aren't too rolled over.  I would have to see a PSS. You would prefer it to be on a wider than 9.5" rim.  You can do a 10.5 stock rear rim on the front, but it sticks out. Needs a bit of negative camber.

295/30/18  on a 18 x 10.5 +22 Volk TE37 .  http://www.2009gtr.c...-te-37s-on.html

Docs car below with stock 285's on the stock 9.5" wheels.

Posted Image


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#34 TheCutter Posted 14 September 2011 - 10:14 AM

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 Spokes, on 14 September 2011 - 09:51 AM, said:

Let me take this question here, is anyone running a 295/35/20 square set up with stock suspension/rims? I'm looking at the Michelin Pilot Super Sport tires, the section width is 11.9in measured on a 10.5in rim, with a dia of 28.1in...I may just go with a 285/30/20 set up.

I was wondering the same thing. Check this thread out. Seems you'll rub in the front with 295 in 20's. I'm planning to go 285/35/20 square next year.


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#35 Spokes Posted 14 September 2011 - 12:21 PM

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Thanks guys for the reply and Sean for the picture. I'll be getting a set of 285/30/20 either PSS or the Kumho SPTs which I ran on my GT3, not bad for the price I also did about 4 DE events on them. At the end they got hard and unpredictable on the track so I started using some take offs and shot A6s. Street tires are what they are on the track. Oh not sure about the Kumho's now, I found them here http://www.treadepot...213.html?CID=21 but tirerack no longer shows them available in a 285, I'll call and check

Also I'm suprised with the amount of front inside wear for stock camber @ -1.1? For the little camber it has it seems like alot of wear though I have almost 14K on the stock tires and with the staggered set up there is no rotation.

I need to hurry up and get some shocks and adj front upper arms.
BTW member ehyman is using a CCW 18x10.5in rim in the front with a 315 A6 & -3+ camber with no rubbing issues  
Also thank you Sean for your help with my Titan on Monday, looks like I only need pads this time around.

Troy


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HKS intercoolers, Synapse intercooler pipe kit, Synapse BOV, Synapse Air Intake, Ti turbo inlet pipe, Forge coolant tank, AMS DPs, Full Ti Greddy Exhaust
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Tillett carbon seats, SS brake lines

#36 seanm Posted 15 September 2011 - 02:23 PM

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 Spokes, on 14 September 2011 - 12:21 PM, said:

I'll call and check Also I'm suprised with the amount of front inside wear for stock camber @ -1.1? For the little camber it has it seems like alot of wear though I have almost 14K on the stock tires and with the staggered set up there is no rotation.

I think 14k miles on the stock front tires isn't bad.  They do wear fairly quickly. I think that would be around a normal wear for them.  This is why I like going to the 285 all around. You can at least take that left front tire off, and move it around the car.


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#37 seanm Posted 15 September 2011 - 02:49 PM

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http://www.2009gtr.c...re-fitment.html

Added some pictures and cleaned up the information a little.  One day I will find some more pictures, and dig though some more old threads.


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#38 SS_GTR Posted 15 September 2011 - 02:56 PM

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Thank you for the thread!  Very informative


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#39 Spokes Posted 19 September 2011 - 04:19 PM

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I ended up getting the Michelin PSS 285s all around, should be able to get better wear for sure and a much lighter tire.

BTW Discount Tires will price match, so I got them for $307 each using this website. http://www.buywheelstoday.com/products/Pilot+Super+Sport BTW I also found the Kumho SPTs @ $250 but I wanted to try out the Michelins, they also offer free towing for the 3years up to 150miles.

Edited by Spokes, 27 September 2011 - 09:02 AM.



JRZ RS Pro, SPL FKS mono ball bushing kit, Cobb sway bars w SPL endlinks, SPL camber, toe and traction links (SPL Traction links did not work with 18x12in rear rims), SPL eccentric lockout kit, Dodson upper arms (Someday maybe the SPL front upper adjustable camber arms)
HKS intercoolers, Synapse intercooler pipe kit, Synapse BOV, Synapse Air Intake, Ti turbo inlet pipe, Forge coolant tank, AMS DPs, Full Ti Greddy Exhaust
EV14 Bosch 1200cc injectors from MZM performance, Drop in Fuel pumps 270LPH, Brisk plugs, Cobb AP (E85 tune from MZM performance)
Tillett carbon seats, SS brake lines

#40 Gigjam Posted 09 October 2011 - 08:47 PM

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edit: didn't look hard enough the first time, got it sorted out now.

Edited by Gigjam, 10 October 2011 - 10:04 AM.



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