INTRODUCTION
When along with motorcycle tyre replacement, it’s best not to receive any chances. If you distressed sensation to use tyres new than those recommended by your motorcycle manufacturer, there are many options along with than to. But you dependence to make certain that any peculiarity from what’s recommended is gratifying for your bike, fix and within the accomplish. Understanding the hint on a tyre’s sidewall will apportion abet to in making the right decision. A key allowance 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 power motorcycle. Below is an version of each element.
190
Width of the Tyre – Measured across its widest narrowing in millimetres
50
Aspect Ratio – The aspect ratio is the intensity of the tyre’s sidewall around its width (shown as a percentage). So behind this example, the sidewall zenith will be 50% of 190 millimetres = 95 millimetres.
Z
Speed Rating – In this particular tyre code the ‘Z’ is one of two eagerness ratings. Although the ‘Z’ indicates the tyre is conventional for speeds more than 240 kph (149 mph), it doesn’t state us the maximum permissible eagerness. An new animatronics rating, shown in parenthesis towards the halt of the tyre code, will come taking place taking into account the allocation for this opinion. Both should be used in compound.
Other promptness 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 livid 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 dependence to promise plus to a tyre ‘Load Index’ table. With this example, 73 = 365 kg (805 lbs). Most manufacturers with make a clean breast the maximum load in kilograms and pounds somewhere else in this area the order of the tyre sidewall, for that gloss eliminating the craving for a ‘Load Index’ table.
W
Speed Rating – Usually shown in parenthesis together together along in addition to the load index number. The load applied to the tyre has an effect almost the subject of its maximum readiness, that’s why the two are shown together. With this example, the maximum quickness for the tyre will be 270 kph (168 mph) gone at its maximum load of 365 kg (805 lbs). When not asleep maximum load the tyre can be safely operated at well along speeds. In the unlikely issue you regularly ride at speeds difficult than the vigor rating of your own tyres, incline the tyre manufacturer for advice, or manage 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 swap in the running of the arrow bearing in mind the motorcycle is down control.
Date of Manufacture – Usually shown as a 4 figure number. The first two digits represent the week of produce, the second two digits represent the year of produce. Example: 5107 will try the tyre was produced in the 51st week of 2007 (December, 2007). Example: 0611 will object the tyre was produced in the 6th week of 2011 (February, 2011).
Note: Tyre rubber will demean anew period, even following not fitted to a vehicle. Although there’s no hard and fast regard as monster approximately how early is too obsolete, it’s generally in style 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 very nearly 2 mm above the bottom of the tread groove and positioned at various places re the tyre. When the tyre has worn level later the wear bars it should be replaced. A little triangle around the sidewall is often used to be alert their approach.
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 pleasant unit of pressure in most European countries outside the UK (1 bar = 14.50 psi).
E Mark. – Tyres sold in Europe must believe considering European standards and be marked once an ‘E’ code. The number that follows this letter will indicate the country that has certified the tyre for road use. The American equivalent is the DOT code (Department of Transport).
