INTRODUCTION
When by now motorcycle tyre replacement, it’s best not to accept to any chances. If you hurting to use tyres auxiliary than those recommended by your motorcycle manufacturer, there are many options comprehensible. But you dependence to create certain that any abnormality from what’s recommended is conventional for your bike, safe and within the pretend. Understanding the recommendation in footnote to a tyre’s sidewall will pronounce in making the right decision. A key part of that is the motorcycle tyre code.
MOTORCYCLE TYRE CODE
190 / 50 ZR 17 (73W) TL
Shown above is a typical code for the rear tyre of a larger carrying out motorcycle. Below is an excuse of each element.
For more info Vietnam Motorbike.
190
Width of the Tyre – Measured across its widest narrowing in millimetres
50
Aspect Ratio – The aspect ratio is the peak of the tyre’s sidewall in marginal note to its width (shown as a percentage). So as soon as this example, the sidewall depth will be 50% of 190 millimetres = 95 millimetres.
Z
Speed Rating – In this particular tyre code the ‘Z’ is one of two moving picture ratings. Although the ‘Z’ indicates the tyre is plenty for speeds far-off and wide-off ahead than 240 kph (149 mph), it doesn’t state us the maximum tolerable quickness. An added life rating, shown in parenthesis towards the fade away of the tyre code, will find the money for this make aware. Both should be used in assimilation.
Other liveliness 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 annoyed 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 compulsion to talk to to a tyre ‘Load Index’ table. With this example, 73 = 365 kg (805 lbs). Most manufacturers as well as insist the maximum load in kilograms and pounds somewhere else on the subject of the tyre sidewall, thus eliminating the need for a ‘Load Index’ table.
W
Speed Rating – Usually shown in parenthesis as soon as the load index number. The load applied to the tyre has an effect upon its maximum enthusiasm, that’s why the two are shown together. With this example, the maximum rapidity for the tyre will be 270 kph (168 mph) behind at its maximum load of 365 kg (805 lbs). When not under maximum load the tyre can be safely operated at far along speeds. In the unlikely situation you regularly ride at speeds on top of the eagerness rating of your own tyres, consent the tyre manufacturer for advice, or promise considering 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 supervision of the arrow taking into consideration the motorcycle is suffering peace subsequently.
Date of Manufacture – Usually shown as a 4 figure number. The first two digits represent the week of fabricate, the second two digits represent the year of manufacture. Example: 5107 will take hope the tyre was produced in the 51st week of 2007 (December, 2007). Example: 0611 will target the tyre was produced in the 6th week of 2011 (February, 2011).
Note: Tyre rubber will degrade greater than grow earliest, even behind than not fitted to a vehicle. Although there’s no hard and immediate deem just just about how outdated is too pass, it’s generally well-liked that tyres should be replaced 5 or 6 years from their date of fabricate.
TWI (Tread Wear Indicator) – Most motorcycle tyres have wear bars located inside the tread grooves. The wear bars are raised about 2 mm above the bottom of the tread groove and positioned at various places concerning the tyre. When the tyre has worn level taking into account the wear bars it should be replaced. A small triangle upon the sidewall is often used to doing their tilt.
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 customary unit of pressure in most European countries outdoor the UK (1 bar = 14.50 psi).
E Mark. – Tyres sold in Europe must agree also European standards and be marked as soon as an ‘E’ code. The number that follows this letter will indicate the country that has attributed the tyre for road use. The American equivalent is the DOT code (Department of Transport).