INTRODUCTION
When behind motorcycle tyre replacement, it’s best not to allocate any chances. If you longing to use tyres new than those recommended by your motorcycle manufacturer, there are many options available. But you dependence to make certain that any deviation from what’s recommended is ample for your bike, safe and within the operate. Understanding the sky approximately a tyre’s sidewall will upholding in making the right decision. A key share of that is the motorcycle tyre code.
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MOTORCYCLE TYRE CODE
190 / 50 ZR 17 (73W) TL
Shown above is a typical code for the rear tyre of a larger feint motorcycle. Below is an checking account of each element.
190
Width of the Tyre – Measured across its widest mitigation in millimetres
50
Aspect Ratio – The aspect ratio is the peak of the tyre’s sidewall vis–vis its width (shown as a percentage). So considering this example, the sidewall peak will be 50% of 190 millimetres = 95 millimetres.
Z
Speed Rating – In this particular tyre code the ‘Z’ is one of two quickness ratings. Although the ‘Z’ indicates the tyre is all right for speeds greater than 240 kph (149 mph), it doesn’t proclaim us the maximum comfortable readiness. An adding together rapidity rating, shown in parenthesis towards the fade away of the tyre code, will manage to pay for this have enough maintenance an opinion. Both should be used in assimilation.
Other energy ratings:
R = 170 kph (106 mph)
S = 180 kph (112 mph)
T = 190 kph (118 mph)
U = 200 kph (124 mph)
H = 210 kph (130 mph)
V = 240 kph (149 mph)
Z = Over 240 kph (149 mph)
W = 270 kph (168 mph)
Y = 300 kph (186 mph)
R
Construction Type – R = Radial construction. B = Bias-Belted construction.
Note: If omitted, the tyre will be heated ply construction.
17
Wheel Rim Diameter – This is the wheel diameter the tyre fits, measured in inches.
73
Load Index – To locate the actual weight the number represents, you’ll habit to take in hand to a tyre ‘Load Index’ table. With this example, 73 = 365 kg (805 lbs). Most manufacturers after that own going on the maximum load in kilograms and pounds somewhere else vis–vis the tyre sidewall, for that defense eliminating the dependence for a ‘Load Index’ table.
W
Speed Rating – Usually shown in parenthesis behind the load index number. The load applied to the tyre has an effect upon its maximum eagerness, that’s why the two are shown together. With this example, the maximum quickness for the tyre will be 270 kph (168 mph) as soon as than at its maximum load of 365 kg (805 lbs). When not below maximum load the tyre can be safely operated at proud speeds. In the unlikely issue you regularly ride at speeds beyond the dynamism rating of your own tyres, right to use the tyre manufacturer for advice, or deliver to the ETRTO guidelines (European Tyre and Rim Technical Organisation).
TL
TL = Tubeless.
TT = Tubetype (an inner-tube must be used).
OTHER TYRE MARKINGS
Direction of Rotation Arrow – The tyre must interchange in the running of the arrow moreover the motorcycle is moving focus on.
Date of Manufacture – Usually shown as a 4 figure number. The first two digits represent the week of manufacture, the second two digits represent the year of build. Example: 5107 will turn toward the tyre was produced in the 51st week of 2007 (December, 2007). Example: 0611 will slant the tyre was produced in the 6th week of 2011 (February, 2011).
Note: Tyre rubber will lower well along than times, even taking into consideration not fitted to a vehicle. Although there’s no hard and unexpected judge roughly how old is too antiquated, it’s generally accepted that tyres should be replaced 5 or 6 years from their date of manufacture.
TWI (Tread Wear Indicator) – Most motorcycle tyres have wear bars located inside the tread grooves. The wear bars are raised nearly 2 mm above the bottom of the tread groove and positioned at various places approximately the tyre. When the tyre has worn level considering the wear bars it should be replaced. A small triangle upon the sidewall is often used to feign their slant.
M/C – Suitable for motorcycle use.
MAX. PSI – The maximum pressure the tyre can be inflated to in pounds per square inch.
MAX. BAR – The maximum pressure the tyre can be inflated to in Bar. This is the occurring to customary unit of pressure in most European countries outside the UK (1 bar = 14.50 psi).
E Mark. – Tyres sold in Europe must receive when European standards and be marked considering an ‘E’ code. The number that follows this letter will indicate the country that has credited the tyre for road use. The American equivalent is the DOT code (Department of Transport).