# You asked: What does the B stand for on a motorcycle tire?

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## What do letters mean on motorcycle tires?

The M stands for a tire that meant to be used on a motorcycle, the following letter is the width code, and the number (such as 90 in this case) still stands for the aspect ratio. In this example, 17 stays the same and represents the rim size.

## What is the B in motorcycle tire size?

Construction. The letter R or B indicates the construction used to create the casing of the motorcycle tire. An R stands for radial construction and a B indicates the casing has a belted bias.

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

The first number is the tire’s width in millimeters; the second represents the tire’s aspect ratio, which describes the tire’s sidewall height as a percentage of its width. In this case we have a tire that’s 130mm wide and 70mm high. R means this tire’s radial, and 17 tells us it fits a 17-inch rim.

## What does R mean on a motorcycle tire?

The “Z” indicates the speed rating of the tyre, which in this case means it is rated above 240kph/149mph. The “R” denotes that the tyre is of radial type construction.

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## What speed rating is R?

Tire Speed Rating Chart

Speed Rating Symbol Speed (mph) Speed (km/h)
R 106 mph 170 km/h
S 112 mph 180 km/h
T 118 mph 190 km/h
U 124 mph 200 km/h

## What does the H stand for on tires?

(H) Speed Rating

The speed rating is a measurement of the speed at which the tire is designed to run for extended periods. An “H” speed rating signifies that this tire can be run safely at speeds of up to 130 mph for extended periods.

## How wide is a 130 motorcycle tire?

Tire Width Cross Reference Table

Permissible Rim Widths Metric Alpha
2.15, 2.50, 2.75 120 MS
2.50, 2.75, 3.00 130 MT
2.75, 3.00, 3.50 140 MU
3.50, 4.00 150 MV

Size MU85B-16