So I got some new wheels; 19x8.5 in front and 19x10 in back. I was trying to see what the ideal tire specs would be for this setup. It seems 245/35 and 275/30 is a common setup, but wanted to get some input from you guys.

 

I have 19x9 19x10 and im running 245/35/19 front 275/35/19 rear, it will give you a no stretch look sidewall will be flat with the rim edge but depending on your offsets wide tires in the back can cause rubbing. Best thing to do is actually measure your rims width and then convert to mm but it will give you an idea were it will sit on the rim & car.

 

19x9 19x10 here also. Running 245/35/19 fronts and 275/35/19 rears. Plan to go to 255/35 or 265/35 in the fronts when I need new tires.

Oh, and 245/275 will be fine on your wheels.

 

http://www.rimsntires.com/rt_specs.jsp

Here is a tire rim comparison website

 

Make sure you run a 35 profile not a 30, it'll throw off your speedometer.

 

Alot of people seem to follow the 245F 275r but 255 all around will give you the best handling for daily driving. you should have gone with 10 all around.

 

This is from MY350Z but also applies to our car


Q: The "Slip" light come on randomly, especially in turns, even though my tires aren't slipping. What's up with that?
A: Both the Traction Control System (TCS) and Vehicle Dynamic Control (VDC) can cause the "slip" light to come on. There are a couple of things that can make it come on even though you don't feel/hear your tires slipping.

The most common cause for this behavior is replacement of the OEM tires with a different size. All Zs come with staggered tires, that is to say the fronts are a little shorter than the rears. This causes the tires to rotate at different rates which TCS and VDC depends on for normal operation. If you install tire combinations that don't maintain that stagger, it can cause problems for TCS/VDC resulting in the "slip" light illuminating.

The stock tire sizes and Outside Diameters are:
225/50/17 25.9"
235/50/17 26.3" (0.4" stagger)

225/45/18 25.9"
245/45/18 26.7" (0.8" stagger)

245/40/18 25.7"
265/35/19 26.3" (0.6" stagger)

265/40/18 26.3"
285/35/19 26.9" (0.6" stagger)

When choosing new tires, try to find front/rear pairs that maintain the stagger of at least ½" and less than 1". You should also look for front/rear setups that maintain the same OD as that will keep your speedometer and odometer accurate.

Here are the most common "upsized" tire combinations. These are known to work and keep TCS/VDC happy.

245/40/18 25.7"
275/40/18 26.6" (0.9" stagger)

245/35/19 25.8"
275/35/19 26.6" (0.8" stagger)

255/35/19 26"
285/35/19 26.9" (0.9" stagger)

245/30/20 25.8"
275/30/20 26.5" (0.7" stagger)

Check the manufacturer's website to find the Outside Diameter of tires before you buy them, or use one of the online tire calculators:
http://www.miata.net/garage/tirecalc.html
http://www.wheelsmaster.com/rt_specs.jsp


A less common cause for the "slip" light to illuminate comes from replacing the fronts or rears only. If you replace only the fronts or rears, the stagger may not be what you think it is because the other worn pair is actually up to ½" smaller than they were when new.

New tires also come with a release agent on the surface of the rubber that must be worn off. That makes them slick and can result in your tires actually slipping, hence the "slip" light.


NOTE: The slip light does and will come on during "normal" driving that is unrelated to tire size or wear. If you apply too much throttle when launching or going around a turn, the wheels will slip and cause the light to illuminate. Also, driving on slick road surfaces (water, oil, rocks) can also cause your tires to slip.

 

Thanks guys for your input, will take all this into consideration. Still waiting on my wheels to get shipped

 

245/35 fronts; 285/30 rears for years. Both same dia with my make of tire. No issues with TCS/VDC. But good advice above about checking manufactures dia specs first. Not all are the exact same dia with the same given size.