ok guys i was just wondering what size tire is the same as a 33 right now im running 33x12.50's would the same height be 285's or bigger i have lift blocks on the back and 2 1/2 inch coil spacers up front what size tire could i go with so i wont have such a big gap in my wheel well

 

I think it is 285's. mine are 265's and they were near 32in new

 

305/70 (33x12.5) almost positive

 

^he got it


i believe its like this


i have 265, and they are 31.8 inches
the 285 are 32.5 i believe
and the 305 are 33.3 inches if i remember correctly

 

A 305x70x16 and a 285x75x16 are both very close to 33" tall. The 305 is wider at just over 12", while the 285 is only about 11" wide.

 

So then what is a 275?

 

ok thanks guys and so olyer if im running 33x12.50 right now and i a lil rub at full lock if i went with 305's i would still rub but if i went with a 285 i most likely wouldn't

 

A 305 70 16 and a 285 70 16 are the same diameter tire. The 305 is 12 inches wide, whereas the 285 is 11 inches. The first numbers is the width in mm. Just divide by 25.4.

The only difference between a 285 and a 305, is width.

 

Um, no... not quite. A 305/70/16 is a 32.8 (~33) by 12.00 inch tire. A 285/70/16 is 31.7 (~32) by 11.22 (~11.25) inch tire.

Its a stupid measuring system but its not complicated... just involves simple math.

The first number is the section width (widest part of the tire, not tread width or rim bead width) in millimeters. The second number is the aspect ratio, which is the section height divided by the section width. So to find the section height, you multiply the section width (the first number) by the second number as a percentage. The third number is the rim diameter in inches.

So as an example, lets go through the 305/70/16:

The section width is 305mm, so divide it by 25.4 mm per inch and you get 12.00 inches.
The section height is 12.00 inches times 70% (or .7), so you get 8.4 inches.
The rim diameter is 16 inches.

To find the total diameter, you have to count the section height twice (above and below the rim) and the rim, so you get 16+(8.4*2)=32.8 inches.

FWIW, a 315 is a 12.5 inch wide tire.

 

Tire Size Comparison
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
285/75-16 8.4in 16.4in 32.8in 103.1in 614 0.0%
305/70-16 8.4in 16.4in 32.8in 103.1in 615 -0.1%