i can get all 4 Dunlop SP Sport 8000™ Ultra High-Performance Radial tires for free from my friend...
Rears are 275/35/18
and the fronts are 245/45/18

can i run 45 in the fronts and 35 in the rear ? any consequences ?
thanks

 

you can... but that's not the best tire size for your car... what would be optimal is 245/40-18 front and 275/40-18 rear... and that's guessing that you have a wide enough rear wheel for the 275 to fit on...

 

stock touring 18's ...

 

not wide enough......you need a 9.5-10" wide rear wheel for thoat rubber

 

I personally wouldn't do it because the sizes are not recommended sizes. (http://www.miata.net/garage/tirecalc.html)

Also, in addition to what others have said, according to the "FAQ" thread posted by DiscountTireDirect up on top,

"NO LESS THAN 1/2 INCH AND NO MORE THAN 3/4 OF AN INCH HEIGHT DIFFERANCE BETWEEN FRONT AND REAR TIRE SIZE FOR ABS BRAKE SYSTEM/TRACTION CONTROL"

Front: 26.7 inch
Rear: 25.6 inch

As you can see, the height diff will exceed the requirement. I suppose if you don't care about the ABS and Traction control, I'd say go for them. They are free!

 

thats the thing , they are free and I need tires...


is it unsafe to run 275 in the rear on stock touring 18 wheels ?

 

I just called the guys from tires.com , and they said its OK to run 275/35/18 in the rear ... can anyone confirm that ?


is anyone running 245/45/18 in the front ??
they said I may experience some rubbing and advised me to go with 245/40/18...

 

275 is too wide for 8" width wheel. They will buldge out but you can still put them on. But the recommended wheel width for 275 is at least 8.5".

I had 275/40/18 in the rear for a very short period of time. See my thread below.

https://my350z.com/forum/showthread....ighlight=nitto

 

thx for the link sho-time , good info...
I think I'll put the tires on and see whats gonna happen..