I have decided on TOYO Proxes T1R. My dillema now is 245/275 or 255/275. what will be the advantage and disadvantage to each. i want to keep the Vdc happy. I done some searcing and didnt really get a def anwser just alot of back and forth.

 

What is the front tire size?
The rear?

 

either 245-40-18f/275-40-18r or 255-40-18f/275-40-18r. I dont autoX my car just daily driving and some trip the drag strip.

 

255 front are actually a real even setup , your going up 30mm front and back , instead or changing the stagger more.

 

any other words of advice on the sizing. my wheels are 8.5 front and 9.5 rears

 

you definately don't need 255 on the front, you'll bubble over a bit, stick with 245 the best for the front. 275 on the rear will be perfect

 

I run 255/40-17F and 275/40 17R for autocross and DD.( I tried 245/45 17's up front but it pushed a little) I'm in a base so I don't have to worry about VDC. I have always heard that the VDC wants the back tires to be a little taller than the front, so I don't think this setup would cause any trouble.

Try this site to see how far off your tires would be from stock.

http://www.miata.net/garage/tirecalcold.html

I just tried the numbers and it looks like the 255/40 18F and the 275/40 18R should work.

 

well i am goin with the 255/40 and 275/40 setup. My buddy over in iraq bought me my front tires for my birthday and he got the 255/40. If Vdc dosent like it then i will just turn it off . Any other objections really to this sizing. I dont want to mount the fronts and have problems.

 

better fit w/ 245/40, 275/40

http://www.1010tires.com/TireSizeCalculator.asp

 

but you are increasing your wheel width up front only 1/2" while the rear is going up 1-1.5" depending on your stock setup

 

well the tires that i am running now on these wheels are a 225-40-18f and 265-40-18 rear.Its and enthusiast so whatever the stock sizes were for it.