# What do the numbers and letters on tires mean?

## What do the numbers and letters on tires mean?

The number is the load rating, or the amount of weight that it can handle. The letter is the speed rating, or the maximum speed the tire is built for. Consult a load and speed index to find out what your tire’s specific rating means.

How do you read tire sizes in inches?

A standard sized tire will be displayed in inches. A tire that reads 33 x 12.5 R15, is 33-inches in diameter (or tall), 12.5-inches wide, and will fit a 15-inch wheel. The door jam of your vehicle will also indicate what size tires the manufacturer recommends.

### Which tire is wider a 65 or 70?

The series number in a tire-numbering system refers to the aspect ratio of the tire’s sidewall height to its width. A series 65 tire’s height is 65 percent of its width, a series 70 tire’s height is 70 percent of its width and so on. These differences in height affect both performance and safety issues while driving.

Are 60 or 70 tires wider?

Generally speaking, a 215-60 series tire is wider and has a shorter sidewall then a 215-70 series tire would be and a 215-75 series tire would be taller and narrower then either the 70 series or the 60 series.

## What size rim fits 35×12 5×17?

8.5”
From what I have read, it can be done but the 35×12. 5×17 tires require an 8.5”wheel to prevent a ballooning effect of the tire causing excessive wear in the center of the tire. A 315/70/17 tire is similar to the 35” tire in size and requires an 8” wide wheel to prevent wear.

How do you calculate the size of a tire?

Here is the basic formula: Tire Diameter = 2 x (section width/25.4) x (aspect ratio/100) + rim diameter. When you plug in the values from our sample tire, the formula looks like this: Tire Diameter = 2 x (235/25.4) x (60/100) + 15.

### How do you read a tire size?

How to Read Tire Sizes. A tire’s dimensions can be determined by reading the markings on the sidewall. An example tire size is 245/45R18, which tells us the width, sidewall height, internal construction and matching wheel diameter. Let’s take a closer look at the size stamp on this Falken ZIEX ZE950 all-season tire.

How do you determine the height of a tire?

You can determine the overall height of the tire, from the road surface to the tread on top of the tire, by multiplying the section height by two, and adding the rim size: 3.54 x 2 = 7.08 + 16 (remember that the two numbers following the letter R tell you the rim size.

## How do you compare tire size?

To compare tire sizes, first select your vehicle stock tire size. Immediately available tire sizes that are with in plus or minus 3% variance will be displayed. Select the tire sizes to compare to your stock size and click ‘Compare Selected Sizes’. Tire diameter can vary slightly for each tire model.