Nissan 370Z Forum
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Nissan 370Z Forum (http://www.the370z.com/)
-   Wheels & Tires (http://www.the370z.com/wheels-tires/)
-   -   Tires: How wide can you go on stock ray wheels?? (http://www.the370z.com/wheels-tires/25420-tires-how-wide-can-you-go-stock-ray-wheels.html)

Mr_Z 09-23-2010 08:33 AM
Quote:
Originally Posted by cossie1600 (Post 732757)
You are stretching a tire beyond its recommendation, there is a reason for that. For racing, it is probably okay. Street tires? I don't know.

The car already plows like a truck stock, extra wide tire in the back and still the skinnys in front? The car will turn worse than my Prius!

Hi,
Small tires up front and large tires in the back do not mean that the car will turn worst then a Prius! IT depends on the car’s need... Check out the Ferrari Enzo for example:
FRONT 245/35 ZR19 – REAR 345/35 ZR19 !! And I am pretty sure it handles pretty well ;)

But I agree with you and most of the others that you should not stretch a tire beyond its recommendation. A therefore, I do not suggest going with tires that require rims of 10.5” if you have the stock wheels. ...I won’t !

Too bad I can't find 305's that fit on 10" wheels... :(

Neo187H 09-23-2010 09:02 AM
Quote:
Originally Posted by Mr_Z (Post 733259)
Small tires up front and large tires in the back do not mean that the car will turn worst then a Prius! IT depends on the car’s need
Thats exactly what he is saying, the car needs larger tires in the front as it already understeers with 30mm difference between them. So by making the difference front to rear larger by going bigger in the rear and staying the same in the front your going to have more understeer.

Rhinetom 09-23-2010 09:20 AM
Nissan engineers have spent countless hours testing proper tire sizes for the stock set up. Any deviation is pointless and may cause negative handling issues. But, what do I know.

Neo187H 09-23-2010 10:23 AM
Quote:
Originally Posted by Rhinetom (Post 733310)
Nissan engineers have spent countless hours testing proper tire sizes for the stock set up. Any deviation is pointless and may cause negative handling issues. But, what do I know.
And they spent countless hours determining the amount of power the car will make, the spring rates, the ride height, the swaybar stiffness yet they can all be improved upon, why not tires too?

Though you make it sound like you have some knowledge in the area so please share as thats the whole point of the thread.

cossie1600 09-23-2010 10:46 AM
enzo has the engine in the back, they are not balanced to begin with!

nissan put stagger tires to protect the guys who cant drive, not because it is fast. also are you telling me the re050a are good tires? really?

tjlazer 09-23-2010 01:02 PM
Quote:
Originally Posted by Azroadster (Post 732549)
I was running (until yesterday!) 305/30 Hankooks on the stock Rays wheel with no problems whatsoever, and I am also running spacers. Here's a pic of my stock wheels with 275/35's in front with a 15mm spacer and 305/30 in the back with a 20mm spacer. No issues at all.

http://www.the370z.com/members/azroa...arter-view.jpg

I just yesterday had my new wheels put on and retained the spacers and the same Hankooks now. Here is that pic.

http://www.the370z.com/members/azroa...ounted-002.jpg

You will have no problems at all running a 305 in the back with the stock wheels. I now intend to lower the car about an inch and I don't anticipate any clearance issues. Alignment issues maybe, but I'm sure that they won't hit anything.

AZ
I hate to say it but the OEMs look better IMHO!

christian370z 09-23-2010 01:36 PM
Quote:
Originally Posted by tjlazer (Post 733609)
I hate to say it but the OEMs look better IMHO!
If they had some concavity, they would be straight sex. It will also look much better when lowered in my opinion.

Mr_Z 09-23-2010 02:09 PM
Quote:
Originally Posted by Rhinetom (Post 733310)
Nissan engineers have spent countless hours testing proper tire sizes for the stock set up. Any deviation is pointless and may cause negative handling issues. But, what do I know.
Sorry to say that I don't agree because they have cost limitation... Even more, by default all companies make their car on purpose to understeer a little, easier in case of slippage for the average driver.

I am an engineer with design and race experience... There is always room for improvement, trust me! When you design a car for road use, it is different from track use. It always a question of compromise. Also from a handling point of view, most of the time the more rubber the better ( if you have the power for it that is...)

And I agree with Cossie1600, on a track, I would put some more rubber up front for sure! But on the roads, it’s another story. Having wide tires in front would cause my car to swing left and right on roads where trucks have distorted the road with their tires.

Anyways, the point of this discussion was to figure out how wide we can go on stock wheels without any issues.

Seems like so far the answer is:

REAR:
  • 305’s will fit in the back (but not recommended because tires are wider than wheels specs)
  • 295’s Would fit on rims... but no tire has a good enough diameter compare to stock.
  • 285’s Would fit on rims too and better diameter available... but there is not much difference with stock in width.

FRONT:
  • 255's to 275’s will fit in the front (It’s a question of personal choice as long as you find a good diameter.)

Let me know if you disagree with anything

Neo187H 09-23-2010 03:05 PM
I THINK that 275s on the front 9" rim would be to wide just like 305s on the rear 10" would be to wide, from what I was reading 265 front is the most thats adviseable. Also increasing the tire size will give some added traction but the real increase will come from putting better rubber on it, going from say the RE05s to RE11s.

Push370zzz 09-23-2010 03:06 PM
Quote:
Originally Posted by Mr_Z (Post 733764)
Sorry to say that I don't agree because they have cost limitation... Even more, by default all companies make their car on purpose to understeer a little, easier in case of slippage for the average driver.

I am an engineer with design and race experience... There is always room for improvement, trust me! When you design a car for road use, it is different from track use. It always a question of compromise. Also from a handling point of view, most of the time the more rubber the better ( if you have the power for it that is...)

And I agree with Cossie1600, on a track, I would put some more rubber up front for sure! But on the roads, it’s another story. Having wide tires in front would cause my car to swing left and right on roads where trucks have distorted the road with their tires.

Anyways, the point of this discussion was to figure out how wide we can go on stock wheels without any issues.

Seems like so far the answer is:

REAR:
  • 305’s will fit in the back (but not recommended because tires are wider than wheels specs)
  • 295’s Would fit on rims... but no tire has a good enough diameter compare to stock.
  • 285’s Would fit on rims too and better diameter available... but there is not much difference with stock in width.

FRONT:
  • 255's to 275’s will fit in the front (It’s a question of personal choice as long as you find a good diameter.)

Let me know if you disagree with anything
:iagree:

Azroadster 09-23-2010 03:48 PM
Quote:
Originally Posted by Neo187H (Post 733984)
I THINK that 275s on the front 9" rim would be to wide just like 305s on the rear 10" would be to wide, from what I was reading 265 front is the most thats adviseable. Also increasing the tire size will give some added traction but the real increase will come from putting better rubber on it, going from say the RE05s to RE11s.
The sport package has 9.5" wheels on the front and 275's fit just fine. I knew I was getting new wheels for my Z when I bought the tires so I purchased 305's for the back. My new rear wheels are 10.5" and the 305's fit great on them.

AZ

cossie1600 09-23-2010 04:20 PM
mine has 19x9

Azroadster 09-23-2010 04:55 PM
Are the they stock Sport Package wheels? The Sport Package came with 9.5's and 10's.

AZ

theDreamer 09-23-2010 04:56 PM
Sport package wheels are 19x9 & 19x10
Nismo wheels are 19x9.5 & 19x10.5

Azroadster 09-23-2010 06:25 PM
You are correct. I stand corrected. Been dealing with spec'ing, purchasing, mounting wheels all week and it all kind of ran together. Anyway, my new wheels are 9.5" & 10.5". Trust me, it's hell gettin' old!

AZ


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