i have 17x8 and 17x9 " wheels and im going to use a 245/45 on the front and was thinking of a 255/40 on the rears 17x9 to get the same hight all around so i dont f up the awd ..??? will a 255/40 get me there???? thanks

 

The approximate sidewall sizes in mm are:

255/40 - 102

235/45 - 105.75

245/40 - 98

245/45 - 110.25

Just multiply the first number by the second number and divide by 100.

-Paul

 

do you guys think i can get away with 245/45 all around ? dont know if that inch will matter ?????

 

Don't do 245/45's. The bigger sidewall just doesn't look very good on the Evo. 255/40's are the best size to go with....all around

 

let me make this simple .. i have 2 17x8 and 2 17x9 rims , using a 245/45 tire on all fours will the hight of the tires be off enough to damage the diff ?????

 

The real simple & obvious answer is: don't use staggered wheel sizes on an awd vehicle. Sorry, this doesn't answer your question. Try using the tire calculator to compare to the stock tire size / diameter.

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

 

Don't put a staggered set on your car if you like your diff. Sorry but, you need to sell them or send them back to the vendor.

 

IT'll be off but it wont really be a big difference.