## How much difference in tire diameter is acceptable?

Generally, it is recommended to not exceed a 3% difference when changing from the OEM size on a non-modified vehicle. A green row means that the alternate tire diameter matches the calculated tire diameter.

**What other tire sizes can I use?**

It depends. Wheels and tires are not interchangeable words. Tires are a part of the wheel setup. For instance, your vehicle has a set size of rims, but you can buy different sizes of tires to fit those rims, as long as the middle of the tires is the correct size.

### What do the numbers in tire size mean?

The two-digit number after the slash mark in a tire size is the aspect ratio. For example, in a size P215/65 R15 tire, the 65 means that the height is equal to 65% of the tire’s width. The bigger the aspect ratio, the bigger the tire’s sidewall will be.

**What size are 32 inch Tyres?**

Diameter Comparison of Light Truck Tire Sizes

Approx. Tire Diameter (in Inches) | P-Metric and European Metric | LT-Metric |
---|---|---|

75-series and 70-series | 75-series and 70-series | |

32 | LT265/75R16 | |

31-1/2 | 265/70R17 | LT265/75R16 |

265/75R16 |

## Do tire sizes have to match exactly?

Width and diameter are the two factors that determine tire and rim compatibility. For diameter you’ll need to be sure that your tires and wheels are an exact match, e.g. a 215/65R17 tire will only fit on a 17″ diameter wheel.

**How much can you go up or down in tire size?**

When changing the car’s original wheels and tires, the general rule of thumb is that you can go up or down by one inch. For example, if your car is currently riding on 17-in wheels, you can reduce the size to 16 inches.

### 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 to calculate tire size?**

To calculate the overall diameter of a tire, the sidewall height must be multiplied by 2 (remembering that the tire diameter is made up of 2 sidewalls, the one above the wheel and the one below the wheel touching the ground) and add the diameter of the wheel.

## What is the overall diameter of a tire?

Tire diameter usually ranges from 12 to 26 inches, and tire width normally ranges from 1.75 to 2.215 inches.

**What size tires fit 17×8?**

245/45R17 is the perfect size for a 17×8. 255/40R17 and 275/40R17 is a perfect size for a 17×9. Put on a 245 or 255 width 45 series tire on the car and if that’s not enough traction then your best bet is a 15″ rim with somthing with some sidewall on it.