Contents

- 1 What do the 3 numbers mean on tire size?
- 2 Can I use 60 instead of 65 tires?
- 3 What does the 265 70r17 mean?
- 4 What does 121 118R mean on tires?
- 5 Can I use 235 tires instead of 225?
- 6 How tall is a 17 inch tire?
- 7 What does the 65 mean on a tire?
- 8 Are 60 or 70 tires wider?
- 9 What is the difference between a 65 and a 70 tire?
- 10 What’s the difference between 265 and 285 tires?
- 11 What does R17 mean on a tire?
- 12 Are wider tires better?
- 13 Should I get H or T rated tires?
- 14 How do you tell what ply a tire is?
- 15 Is Load Index 121 a 10-ply tire?

## What do the 3 numbers mean on tire size?

B: **TIRE** WIDTH The **three**-digit number following the letter is the **tire’s** width (from side to side, looking at the **tire** head on) in millimeters. It’s the height of the sidewall measured from wheel rim to top of the tread, expressed as a percentage of **tire** width. In other words, it’s sidewall height divided by **tire** width.

## Can I use 60 instead of 65 tires?

Physically, yes they will fit. It is recommended to stay within 3% of the original **tire** size on the car though. The size you have is 3.09% smaller, so not recommended. You **could** go with 205/**60**-15 though if you **can** get a better deal on that size.

## What does the 265 70r17 mean?

This number indicates that your tire has a width of **265** millimeters. 70. This number **means** that your tire has an aspect ratio of 70%. In other words, your tire’s sidewall height (from the edge of the rim to the tire’s tread) is 70% of the width. In this case, the sidewall height works out to be 185 millimeters.

## What does 121 118R mean on tires?

90S, 95T, **121**/**118R**, etc. These digits after the **tire** size, 90S in this example, are the “load index” and “speed rating”. That just **means** that the maximum pressure on one **tire** is higher than the other. However, this again is only at maximum pressure which is more than you **would** usually use.

## Can I use 235 tires instead of 225?

Yesthat size will work 100% perfectly, as it is the exact same diameter as the **225**/75-16. **235**/70-16 is actually a shorter **tire**.

## How tall is a 17 inch tire?

17 INCH TIRES |
TIRE HEIGHT |
---|---|

225 35 17 |
23.20 |

245 35 17 |
23.75 |

315 35 17 |
25.68 |

335 35 17 |
26.23 |

## What does the 65 mean on a tire?

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.

## 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 is the difference between a 65 and a 70 tire?

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.

## What’s the difference between 265 and 285 tires?

The larger **285**/70R17 **tire in the** photo above stands over an inch taller and is nearly an inch wider than the **265**/70R17 size. The width of the tread is also a half-inch wider. Many late-model domestic trucks accept this **difference** in size.

## What does R17 mean on a tire?

17 The last dimension listed in the size is the diameter of the wheel rim, which is most often measured in inches. LOAD INDEX AND SPEED RATING. Example: P225/50/**R17** 98H.

## Are wider tires better?

From a safety point of view, both types have their **good** sides: On a dry road, **wider tires** will offer more grip than narrow ones, but the risk of aquaplaning will be higher with **wide tires**. ā In the winter, narrow **tires** are **better** under extreme conditions as they provide higher surface pressure against the road.

## Should I get H or T rated tires?

**Tires** with higher speed ratings generally **have** better steering response and cornering grip than lower-speed **rated tires**, in addition to being capable of higher speeds. So if your car originally came with **H**–**rated tires**, that’s what you **should** replace them with. Sticking with **H**–**rated tires** comes at a cost.

## How do you tell what ply a tire is?

There are letters on the **tire’s** sidewall that correspond with “**tire** load range,” historically known as the “**tire ply** rating.” Load range and **ply** rating specifically refer to how much load your **tire** can support at maximum allowable air pressure.

## Is Load Index 121 a 10-ply tire?

Therefore **load** range simply tells how tough the **tire** is and the allowable PSI. For example, an āEā **load** range indicates that a **tire** is equivalent to a **10**–**ply** construction **tire**. In realitly, this **tire** is not built with **10 plies**, but rather one or two **plies** of equivalent strength.