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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

ABS

An Anti-lock Braking System is a system that prevents the wheels from locking up when braking so they don't lose grip. The system works by partially releasing the brakes as soon as the wheels begin to lock, so they don't slip (lose grip).

ACT

Michelin Adaptive Casing Technology
The rigidity of the casing differs as a function of the angle of lean. The more flexible crown ensures straight-line stability while the casing becomes increasingly rigid towards the shoulders for optimum handling when cornering.

ADT

Amplified Density Technology
A highly dense, more rigid tyre casing, which helps deliver excellent feedback and handling. Aramid tread plies on the rear tyre resist centrifugal growth, reduce weight and provide excellent stability.

Aquaplaning

A loss of grip at high speeds caused by a film of water between the tyre and the road, creating a slippery surface.

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B

Balance

Accurate tyre/wheel mass distribution across its rotational axis.

BibMousse

The BibMousse replaces a tube inside a motorcycle tyre. It is for off-road, motocross, trial, MX, Enduro tyres etc. One advantage of the BibMousse is that it can't be punctured because it is solid, nor do you need to check the tyre pressure.

Bore

The diameter of a cylinder

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C

Carcass

The internal part of the tyre that makes up its structure. This is the part that absorbs all of the forces applied to the tyre. It is made from plies covered by a belt and then the tread and sidewalls.

Contact patch

This is the contact area between your tyre and the road.

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D

Diameter

When we talk about tyre diameter, we're always referring to the inside diameter of the tyre, i.e. the diameter of the wheel rim. It is measured in inches.

DOT

The acronym of the United States Department of Transportation. If you see this stamped on the side of the tyre you know that it has been approved for use by this organisation.

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E

Engine displacement

Engine displacement refers to the engine's capacity in CCs or cm3. Generally speaking, engine displacement is an important factor in determining the power of your bike's engine.

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F

FIM

An acronym indicating that the tyre has been approved by FIM for Enduro use (tread depth of 13mm).

Front/Rear

A tyre that can be safely fitted to the front or rear of your motorcycle.

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H

Hard

Difficult terrain that requires harder rubber.

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I

Inner liner

An inner liner is a layer of a synthetic rubber compound, the modern equivalent of a tube, which is designed to keep the tyre airtight.

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L

LR

Low rolling resistance tyres that decrease the rolling effort required.

Load index

A numerical index that indicates the maximum weight that the tyre can withstand when inflated to the recommended pressure.

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M

M+S

An abbreviation of the term "mud and snow", which is used specifically for winter tyres to indicate that they may be used on this kind of terrain.

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N

NHS

Not for Highway Service i.e. Not approved for the road.

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P

Ply

A layer that makes up the tyre.

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S

Sand

Tyres suited for use on sandy tracks

Sculpting/Sculpture

Refers to the tyre's tread pattern

Section height

The height of the tyre from the crown of the tread to the bottom of the tyre bead.

Section width

The distance between the tyres sidewalls.

Shoulder

The external part of the tyre tread that joins to the sidewall of the tyre.

Sidewall

The external wall of the tyre between the tread shoulder and the tyre bead. It protects the tyre from impacts (pot-holes, cobblestones…). This part of the tyre is made in durable rubber and it's where you'll find all of the tyre's essential information.

Sipes

Special slits cut into the tyres contact surface with the road. They improve road holding properties when the surface is less than ideal (rain, black ice, snow).

Slick

Smooth tyres

Soft

Mixed or soft terrain requires soft rubber

Speed rating

A numerical rating that indicates the maximum speed that the tyre can withstand.

Supersoft

Very soft rubber suited for use on soft terrain

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T

Tyre bead

Part of the tyre that fits against the wheel rim.

Tyre tread

The external part of the tyre that is in contact with the road. Its role is to ensure grip as well as enabling precise riding.

Tread grooves

The term tread grooves refers to the space between two blocks of tyre tread.

Tube

An inflatable rubber device that fits between the wheel rim and the tyre.

Tube Type (TT)

A tyre that requires a tube.

Tubeless (TL)

A tyre without an external tube. Airtightness is achieved by using an inner liner in direct contact with the tyre carcass.

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U

Unusual wear

Abnormal tyre wear that may result from a wide range of external factors, etc...

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V

Valve

A component that regulates the entry of air into the tyre. It also prevents air from escaping from the tyre and prevents dust from getting inside the tyre.
Valves can be found on the tube for tyres that have one, or on the wheel rim for tubeless tyres.

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W

WET

Tyres suited for use on wet circuits.

Wear

Visible damage and deterioration of the tyre.

Wheel

Composed of a wheel rim and a disk.

Wheel rim

The circular metallic part of the wheel onto which the tyre is placed.

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