MOTORCYCLE TYRE MARKINGS: UNDERSTANDING THE LANGUAGE!
Every industry has its own terminology, and the tire business is no different. Deciphering this language can significantly enhance your understanding of what you require. Fortunately, much of this information is readily available – it's right there on your bike, visible to you at this very moment!
We're not referring to the owner's manual tucked beneath the seat (although it does contain valuable information). It's even simpler than that: by regulation, tyres must bear a wealth of detailed information imprinted on their sidewalls, covering aspects like size, speed and weight ratings, among others. Familiarise yourself with these numbers, letters, and symbols, and you'll be well-equipped to navigate the world of tires. Here's a concise yet comprehensive breakdown of what it all signifies.
Remember, we're here to assist you with any inquiries you may have! Feel free to reach out to us at +44 1285 706999.
DIMENSIONS (1, 2, and 4 in the diagram)
Let's start with the basics – the physical dimensions of the tyre, prominently displayed on the sidewall alongside the brand. For instance, a typical front tyre might be labeled as 120/70 17, while a common rear tyre could be 180/55 17. This information comprises three components: the tyre's width in millimetres, the aspect ratio (indicating the tire's height as a percentage of its width), and the diameter of the wheel it fits (in inches). Thus, a typical front tyre labeled as 120/70 17 is 120mm wide (1), has a height of 70% (2) of its width (approximately 84mm), and fits a 17-inch rim (4). It's straightforward.
CONSTRUCTION TYPE – radial or cross-ply (3)
Tyres are primarily constructed in two ways: radial and cross-ply. Radial tyres feature strengthening cords arranged radially from one edge of the tyre rim straight across the tread to the other, positioned at a 90-degree angle to the direction of travel. In contrast, cross-ply tyres, an older technology, employ different arrangements of plies or materials crossing over each other beneath the tire tread. Cross-ply tyres typically have taller sidewalls and are better suited for older bikes, commuter, and off-road machines.
Radial tyres are identified by the letter 'R' following the speed rating. For example, a 120/70 16 ZR denotes a radial tire with a Z speed rating.
LOAD INDEX (6)
Similar to the speed rating, tyres are designed to withstand specific loads in terms of weight. It's crucial to ensure that the tire is appropriate for your motorcycle. Consider the load you'll be carrying, including any passengers or luggage if applicable. Remember, the indicated weight is per tyre.
The load index is represented by a two-digit number, also specified on the tyre. Don't hesitate to contact us if you have any questions regarding the Load Index.
SPEED RATING (7)
As speeds increase, the forces exerted on a tyre become more significant, necessitating a maximum speed rating. It's essential to select a tyre suitable for your motorcycle based on its maximum speed capability. The speed rating is denoted by a single capital letter alongside the tyre size. Thus, our typical front tire, such as a 120/70 17 Z, is suitable for speeds exceeding 150mph.
Below is a list of speed ratings:
J 62mph
K 69mph
L 75mph
M 81mph
P 95mph
Q 100mph
R 105mph
S 113mph
T 118mph
U 125mph
H 130mph
V 149mph
W 168mph
Z Over 150mph
TUBE/TUBELESS- type (8)
Tyres can be either tube-type, requiring an inner tube to retain air, or tubeless, featuring an airtight lining that eliminates the need for a tube.
The choice between them depends on your wheels. Traditional wire-spoked rims necessitate inner tubes, similar to bicycles, due to the unsealed wire spokes at the rim's outer edge, which would result in air leakage. Therefore, tube-type rims must be paired with an inner tube, but you can use either tube-type or tubeless tyres. Some modern designs incorporate tubeless wire-spoked wheels, where the spokes attach to the rim's outer edge rather than passing through the centre, ensuring airtightness.
The tyre will indicate whether it is tube-type or tubeless.
ROTATION ARROW (9)
Most tyres are designed for uni-directional use, featuring an arrow on the sidewall indicating the correct rotation direction when mounted on the bike and moving forward. Incorrect placement of the tyre can lead to an MOT failure and poses a safety risk, so always verify during purchase or installation.
The arrow typically includes 'front' or 'rear,' indicating which end it should be mounted on. It's straightforward: avoid using a front tire on the rear wheel, or vice versa. Although there are very few tyres that can be used interchangeably between the front and rear, these are typically classic or small-capacity models.
DATE CODE (10)
Similar to perishable goods like beverages, tyres have a limited lifespan. It's advisable to use them promptly and replace them when necessary.
You can determine the tyre's age by inspecting the production date, represented by a four-digit number enclosed within an oval. This number indicates the week and year of manufacture; for instance, '2319' denotes a tire manufactured in the 23rd week of 2019.
E-MARKING (10)
The letter 'E' followed by a number indicates approval from a specific European country regarding the tyre's construction.
DOT MARK (10)
The DOT mark, signifying compliance with regulations set by the US Department of Transportation, assures the tyre's road legality and successful completion of safety testing.
BRAND/LOGO/MODEL MARKS (11)
Tyres serve as rolling advertisements for manufacturers, who prominently display their model and brand names on the sidewalls. Manufacturers often invest effort in the graphic design of logos and other elements to enhance the sidewall's aesthetics.
COUNTRY OF CONSTRUCTION (12)
This one's straightforward!
Comments