# Mountain bike tyres, could somebody explain what the markings mean?

4 min read

##### Asked by: Stephanie Lopez

## What do the numbers on MTB tires mean?

**The larger number is the tire diameter in inches, and the smaller number is the tire width in inches**. Tire diameter usually ranges from 12 to 26 inches, and tire width normally ranges from 1.75 to 2.215 inches.

## How do you read bike tire markings?

Check your tire’s sidewall—**the numbers there indicate your tire size (roughly its outer diameter and its width, but not always in that order)**. Typical road bike tire: 700 x 32c indicates a tire that has an outer diameter of 700mm and a width of 32mm.

## What do the markings on a bike tyre mean?

**The first number refers to the width of the tyre, and the second number refers to the inner diameter of the tyre**. And finally there is also inch markings, which look like this; 28 x 1.40″. In this case, the first number refers to the outer diameter of the rim and the second number refers to the tyre width.

## How do you read a mountain bike tire?

Generally, bike tire sizes are indicated with **two numbers that correspond roughly to the outside diameter of the tire and the width of the tire**. These would usually be measured in inches (26″, 27″, etc.) or millimeters (650, 700, etc.).

## What do tire numbers and letters 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**. As an example, a tire rated 90R could safely carry 1,323 pounds and travel at 106 mph. Consult a load and speed index to find out what your tire’s specific rating means.

## What Tyres numbers mean?

The important number on the side of your tyre – **the indicate the size, profile and the weight and speed ratings of your tyre**. These number represent, in order, the section width (225), aspect ratio (45), construction (R), rim diameter (19), load index (92) and speed rating (W).

## How do you read a tyre label?

**Using our image as an example, here’s what each marking means:**

- 193 – The width of the tyre in millimetres.
- 60 – The height of the tyre sidewall as a percentage of the width of the tyre.
- R – The tyre is of radial construction.
- 15 – The diameter of the wheel’s inner rim in inches.
- 94 – Indicates the load rating of the tyre.

## How do you read a tyre description?

**How to Read Tyre Size?**

- The Letters “P” and “LT” For most vehicles, you’ll see the letter “P” before the number sequence begins: P225/70R16 91S. …
- Width. …
- Aspect Ratio. …
- Construction. …
- Rim Diameter. …
- Load Index. …
- Speed Rating.

## What do the tyre symbols mean?

**Letters ranging from A to Z represent the speed rating**. Each letter denotes the maximum speed a tyre can sustain under its recommended load capacity. In our example, “H” is equivalent to a maximum speed of 130 mph (209 kph).

## What do symbols on tires mean?

Quote from video: *Похожие запросы*

## Why is 27.5 better than 26?

27.5″ versus 26″ Wheels

**Larger wheels hold more speed than smaller wheels due to rotational inertia**, making the 27.5″ a faster ride than a conventional 26″ wheel. Once you get moving, it’s easier to stay moving.

## What is the meaning of 27.5 in bike?

If you haven’t caught on by now, 27.5 is **the diameter of the wheel in inches** which makes it obviously smaller than a 29er wheel. The change in wheel size makes a noticeable difference in how the bike rides, handles, and more. The 27.5 wheel is notorious for being a great compromise between agility and speed.

## What does H and L mean on MTB?

You need to adjust the high (H) and low (L) limit screws on the derailleur. Viewed from behind the bike, **the H screw limits how far the derailleur can move to the right, while the L screw limits how far the derailleur can move to the left**.

## What does +15 mean on RIM?

This is an important number—this is the number you’ll refer to when you need to know your tire size! The “15” **indicates that this particular tire would fit a rim with a 15-inch diameter**.

## What does the J mean on wheels?

tyre bead profile

The letter “J” means **a tyre bead profile**. This is the marking used to define the wheel collar profile you should never ignore. Wheel collars and tyres must be compatible.

## How do you read wheel numbers?

Quote from video: *The second number is the diameter of an imaginary circle in inches or millimeters that runs through the center of each of the studs or in this case 170 millimeters on a 4 6 or an 8 lug wheel.*