How do I match tire size to rims?
Multiply the width in inches by 25.4 (the number of millimeters per inch). This calculation gives you the first number in the tire size. Typically, you can add up to 10 millimeters to the width. So if you had an 8.5-inch rim, the section width range you can safely use is between 215 and 225.
Which number is the rim size on a tire?
You may also occasionally see RF indicating a run flat tire or ZR indicating a tire that is a speed rating higher than V. The next number is the diameter code, in inches, of the rim onto which the tire can be mounted. For example, a tire with the P225/70R16 91S would fit a rim with a 16-inch diameter.
What should the rim size be on a tire?
Tires have flexible sidewalls and can fit to most rims, but it’s best and safest to use a width chart so as not to compromise a tire or have it fail because it’s too wide for the rim. The 4.5 is the bolt pattern, measured from the two bolt holes farthest apart. This number also determines whether the rim will fit on your vehicle or not.
What do the numbers on a tire mean?
Tires sizes with these letters are for trailer wheels only. Using a P215/65R15-size tire as an example, we can tell that the tire is for a passenger vehicle and has a 215-millimeter width. On the right side of the slash symbol, you’ll find two numbers, a letter, and two more numbers.
What are the dimensions of a 14.5 inch tire?
These sizes are usually 14.5, 15.5, 16.5, 17.5, and 19.5 inches, and an example would be 33×12.5R16.5 118R. Tires and wheels with unique rim diameters should never be combined with traditional inch rim tires and wheels.
What are the dimensions of a metric tire?
The second number on a metric tire is to calculate the side wall measurement. The sidewall height is a percentage of the width of the tire. This second number is that percent. The sidewall height or “aspect ratio” of a 285/75/R16 tire is 75% of 285mm. Example: 285/75R16 (285 X 75 / 2540 x 2) + 16 = 32.8 inches tall.
What do the numbers mean on a tire size?
The first three-digit number in the tire size refers to the tire width. For instance, in a size P215/65 R15 tire, the width is 215 millimeters. Is the ratio of the height of the tire’s cross-section to its width. The two-digit number after the slash mark in a tire size is the aspect ratio.
Where do I find the rim size on a WTB tire?
Also commonly referred to as “casing width,” section width is expressed as the first two digits in the ETRTO size designation “XX – XXX” marked on the sidewall of every WTB tire. STEP 2: WHAT IS YOUR RIM SIZE?
What is the section width of a tire?
Rim Width Range. The tire has a section width of 8.23″ (209mm) when mounted on a 6.0″ wide wheel. If that tire were mounted on all of the rims within its range, the tire’s approximate section width would change as follows:
How big of a tire do I need for a 9.0 wide wheel?
For example a tire size 35X12.50-20 is typically fitted on a 9.0″ wide wheel, therefore the tire width is 12.5″ with the wheel much narrower than the tread width. For sports cars, the general rule of thumb is to match the wheel width to the tread width in inches. For example a tire size 285/35-19 has a tread width of 9.9″.