Weight of the OEM 18x8/18x9 wheels?
 

Does anyone know the weight of the OEM F:18x8 R:18x9 wheels?

Also I heard that it is important that any new wheel/tire combo weight not exceed the OEM wheel/tire weight as this will result in a decrease in handling and breaking performance. Can anyone confirm or deny this?

You will want to stay within the oem wheel/tire height on the car for the speedometer and traction control system. There are plenty of people on here that are running wheels that are heavier than OEM.

Our oem wheels are very light as is and there is not much you could replace them with that would be significantly lighter. The difference that a few lbs will make on your wheels will not negatively affect your performance to a degree that you will be able to notice... Choose wheels that you like, You will be fine!

[QUOTE=corbin09;1382329]You will want to stay within the oem wheel/tire height on the car for the speedometer and traction control system.

And what it will concretely do if the height change??
Coz i'm going to run r888 for track on stock wheel, but the final diameter with those r888 will reduce the diameter of 45mm for front and 28mm for rear.

Setup for track only... i'm not going to have problem with that right??

Thanks for the info Corbin. My budget is smaller than what most people in the forum seem to be working with. For example, I was limited my search to wheels that match the 18x8/18x9 factory size because I only need rear tires at the moment and wasn't in the position to get both wheels and tires right now. Unfortunately, I found a couple of nice options in 18x8 and some in 18x9 but hardly anything that was available in both sizes.

I'm getting some quotes today on powder coating the OEM wheels black to match the car. I think that will improve the look for under $500.

If anyone reads this post and knows of black after market rims available in 18x8 and 18x9 for under $500, please send me link(s).

Meanwhile I will look in envy at the photos of you guys dropping $2k on wheels alone, LOL

Traction control
 

Corbin (or anyone else who knows),

You're not the first person to mention issues with the Traction Control system. The rep from TireRack.com told me....

"The traction control on the 370Z has a very tight tolerance and you should not change the tire size. I would strongly suggest that you contact your Nissan dealer before you make a change like this."

...yet, I've read a couple of posts on here from people who have change the tire size. If they're experiencing any adverse side effects, they didn't mention it. What kind of issues may I run into with the Traction Control system?

Tim

As far as tire size, you should be fine as long as you stay within the same overall diameter. Going with wider tires is fine if you match it with correct sidewall height, which is what most people do. There shouldn't be any issues with the traction control. Traction control works by reading wheel speed. A lost of traction is determined if a wheel is spinning faster than the other, so you want to keep the speedometer reading consistant with the factory parameters.

Thanks Mike. That's what my friend thought too. The rep at TireRack disagreed but I think you all are right and he is wrong.

So, I am currently running stock roadster 18 wheels and thinking about getting Nismo wheels (18-->19). Will this pose a problem with alignment, misreading of mileage...etc? If it does alter the car performance what do I need to do to bring it back to spec once it installed? Thanks!

Qartermaine, I'm not sure about the performance, alignment and "etc" issues but regarding your question on misreading mileage there's a simple calculator at Tire Size Calculator - tire & wheel plus sizing where you can put in the tire size you have and what you're going to and it will tell you how much your speedometer will be off by after the change.

Tim

Can anyone tell me what affect it will have if I place the original 225/50ZR18 front - 245/45ZR18 rear tires on 18x8.5/18x9.5 instead of the factory 18x8/18x9 wheel combo?

Nothing bad will happen if you stretch the tires a tad. You will be fine with those sizes.

I dont understand why so many people keep asking the same kind of question. Look the Z34 is the same across the board, Roadster, Base, Touring, Nismo. The wheels all work interchangably with no issues people. Relax and go for a drive.

:ughdance:

True, but..... is the diameter different between them all?

The diameters are...

Base: F 18X8 R 18X9
Rays: F 19X9 R 19X10
Nismo: F 19X9.5 R 19X10

If you're talking about the diameter of the tire they are....

Base: 225/50R18 26.85 in 245/45R18 26.68 in
Rays: 245/40R19 26.71 in 275/35R19 26.57 in

I don't have the Nismo tire size but keep in mind these cars are mass produced. Nissan isn't going to calibrate the speedometer three different ways. It's much cheaper for them to keep all the wheels they offer roughly the same diameter so they don't have to fiddle with the speedometer for each model

I was getting at the actual diameter of the tire needs to stay the same for ABS and whatnot to function as designed. And of course, to keep your speedometer right.

This will answer everything...
Tire Size Calculator - tire & wheel plus sizing

If you plug in any of the 3 factory wheel options, you'll see they're all just over 26.5". If you want to run another size like 275/40R18, you can plug different sizes into that calculator until you come up with a near 26.5" diameter.

if you like your tires stretched,,,,i run 245/45 up front & 275/40 in rear.
both are 26.7" tall & performance is great!:ughdance:

A few points worth mentioning:

1) Tires do not all weigh the same
2) Tires will affect handling just as much or more than wheels
3) I use a smaller diameter wheel/tire combo and have never had problems with the traction systems (on track or street).