How do you Read Tire Charts..? what does 235-40 mean?
 

245-35....vice versa... i just bout some new volk GT-U's which are 17X8 AND 18X11 .. I NEED SOME KNOWLEGE in picking out the right tires for my wheels.. im currently looking at the YOKOHAMA'S ES-100..

18 Inch tires
235-40..?
245.35?
255.35?
365.35?

235 is the tread width and the 40 is the side wall height if im not mistaking

OMG ive always wondered but i never wanted to ask because i was to embarassed.

lol its all good.

Kind of...

The 40 indicates that this tire size's sidewall height (from rim to tread) is 40% of its section width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall.

Taken from tirerack and changed the 50 to a 40 to be pertinent to this thread. Simply put, it's a ratio not an exact measurement like the width.

235/40/18........the 235 is width in millimeteres of the tire, 40 is aspect ratio between sidewall and width, i.e. it means that the sidewall is 40% of the 235 width. And the 18 is the size rim it will fit on

*edit ddub beat me to it

Hope you have fender flares in the rear.....

I would post the offset of those wheels so we can how they are going to fit (or not)....

Keep in mind that your speedometer reads distance by the outside circumference of you wheel and tire combination, so if you change the diameter of the package your speedo will start telling you the wrong speed. Measure your stock rims and ensure your new package has the same diameter or have your speedometer recalibrated.