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Tyre Glossary :

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

A

Abnormal wear and tear

Unusual tyre wear and tear which may be due to improper wheel balance, the suspensions being in bad shape, or a variety of hostile external factors, etc.

ABS

The anti-lock braking system aims to reduce the loss of grip during braking. The system works by partially releasing the brakes every time the wheel begins to lock up, thus preventing the tyre from sliding on the road (loss of grip), and increasing the overall ability of the brakes to work effectively.

ACT

Michelin Adaptive Casing Technology
The carcass enables the rigidity of the tyre to adjust to the camber angle. Therefore, depending on the camber angle, the tyre gradually goes from having a flexible top ensuring stability on straight stretches, to increasingly rigid shoulders depending on the lean angle taken by the motorcycle. This provides optimal performance around curves.

ADT

Amplified Density Technology A high-density, stiffer carcass provides for superb maneuverability and responsiveness. Aramid fiber layers on top in back combine resistance with a lightweight feel for perfect stability, even at high speeds.

Aquaplaning

Loss of grip at high speeds caused by a film of water between the tyre and road, making it slippery.

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B

Bead

Part of the tyre that fits to the motorcycle rim.

Bib Mousse

Bib Mousse replaces the inner tube of the motorcycle tyre. It is mainly used for Off-road, Motocross, Trial, MX, and Enduro tyres, etc. It is already full, which means you can enjoy puncture-free riding without having to check its pressure.

Bore

Cylinder diameter

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C

Carcass

This is the internal part of the tyre, making up its structure. The carcass supports the entire strain put on the tyre. It is made of steel and textile cord layers, upon which the belt and then tyre tread and sidewalls are fitted.

Contact patch

Also referred to as the "footprint," this patch corresponds to the area of contact between the road and your tyre.

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D

Diameter

When we talk about a tyre’s diameter, we always mean the interior diameter, or the diameter of the rim. It is expressed in inches (1 inch = 2.54 mm).

DOT

Acronym for the U.S. Department of Transportation. This inscription on the tyre's sidewall confirms that the tyre complies with the requirements of this agency.

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E

Equilibrium

Good equilibrium is equivalent to good distribution of the mass of the tyre/wheel ensemble compared to its axis of rotation.

Engine displacement

Engine displacement designates engine capacity in cc or cylinders. It largely determines the power of a motorcycle’s engine.

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F

FIM

Symbol indicating that the tyre is approved by the FIM for enduro (with grooves that are 13 mm deep).

Footprint

Contact zone between the tyre and the road (also referred to as contact patch).

Front/Rear

A tyre that can be installed both on the front or the back of your motorcycle.

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G

Groove

Also called tread grooves, grooves are the spaces between two adjacent tread ribs on the tyre tread.

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H

Hard

Difficult terrain requiring harder rubber.

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I

Internal rubber

The inside rubber is a layer of synthetic rubber, which is the modern equivalent of the tube, and whose function is to guarantee the tyre's impermeability.

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L

Layer

Layer making up the belt

Liner

A rubber coating providing tubeless tyres with their impermeability

Load index

Numbered index indicating the maximum weight supported by a tyre inflated with the recommended pressure.

LR

Low Rolling Resistance

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M

M+S

"Mud and snow," or special winter tyres that can be used on these two types of terrains.

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N

NHS

Not approved for street use

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R

Rim

Circular metal part of the wheel upon which the tyre is fitted.

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S

Sand

Tyres suitable for sandy race tracks

Section height

Tyre height between the top of the tyre tread and the base of the bead.

Section width

Distance separating the outsides of the tyre sidewalls

Shoulder

The outside part of the tyre tread allowing for the junction with the sidewalls.

Sidewall

The tyre's external wall between the tyre tread shoulder and the bead. It protects the tyre from shocks (potholes, cobblestones, etc.). This strong rubber component also houses the markings providing the tyre's essential information.

Sipes

Special vents found on the part of the tyre in contact with the ground. They improve street performance when the surface is not ideal (rain, ice, snow).

Slick

Smooth tyres

Soft

Mixed-to-soft terrains requiring a softer rubber

Speed index

Numbered index indicating the maximum speed the pneumatic tyre can handle.

Structure

Indicates the composition of the tyre carcass layer

Supersoft

Super soft rubber, suitable for soft terrains

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T

Tyre tread

This is the outer part of the tyre which is in contact with the road. Its job is to guarantee grip in all conditions (dry, wet, etc.) as well as contribute to steering precision. Because this part cannot escape the effects of deterioration, it must be as resistant to wear and tear as possible.

Tread

Corresponds to the tyre tread design

Tube

This is an inflatable rubber tube located between the tyre and the rim.

Tube Type(TT)

Tyre consisting of a tube

Tubeless(TL)

Tubeless tyre. It remains impermeable thanks to its internal rubber, which is in direct contact with the tyre carcass.

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V

Valve

The component that allows for air to be distributed evenly into the tyre. It prevents air from leaving the tyre, and prevents dust from infiltrating the inside. This valve is located on the tube for tyres with tubes, and on the rim for tubeless tyres.

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W

Wear and tear

Damage and deterioration that can be seen on the tyre.

WET

Tyre suitable for riding on wet surfaces.

Wheel

Assembly of the rim with a disc or veil

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