I looking to find some front tires and i cant find any new/used 225/30-18 through 255/30-18. I'm looking to match the rears and it seems that 335 series tires only come with 30 and not 35 sidewalls? I just dont want to look like an idiot with 35s on from and 30s on the back, maybe if it was the other way around i could deal with it. any suggestions.

 

Your notion of aspect ratios is incorrect..

read this
http://www.tirerack.com/tires/tirete...nformation.jsp

 

so its ratio not a direct size measurment?

 

yup.

 

height of sidewall = width * aspect ratio/100

(285/30) 285 * 30/100 = 85.5mm = 3.37"

-Max

 

even more simple:
285 (or whatever the width is) x .3 (or whatever the sidewall is). it's a percentage.

 

You might be surprised how many people don't know that 30% = .3 = 30/100.

I wanted to be clear, so I spelled it out. But I used .3 when I typed it into the calculator.

-Max

 

so if you have 245/35/18, it would have the same sidewall thickness.

85.5/35*100 = 244.xxx mm

 

tire rack suggested 245/40 to match the rear 335/30

 

I HOPE YOU ARE JOKING!!!!

 

Well, their size suggestion is good from a sidewall height matching issue, but necessarily a fitment or handling issue. I would just run 255/35 or 265/35 up front.

I assume you are getting a widebody/fender flares?