உங்களுடைய வாகனத்தின் டயர் எத்தனை கிலோமீட்டர் வேகம் வரை சென்றால் தாங்கக்கூடியது என அறிந்து கொள்ளுங்கள்.

Speed rating

The speed symbol is made up of a single letter or an A with one number. It indicates the maximum speed at which the tire can carry a load corresponding to its Load Index

Speed rating

Code	mph	km/h		Code	mph	km/h
A1	3	5		L	75	120
A2	6	10		M	81	130
A3	9	15		N	87	140
A4	12	20		P	94	150
A5	16	25		Q	100	160
A6	19	30		R	106	170
A7	22	35		S	112	180
A8	25	40		T	118	190
B	31	50		U	124	200
C	37	60		H	130	210
D	40	65		V	149	240
E	43	70		Z	over 149	over 240
F	50	80		W	168	270
G	56	90		(W)	over 168	over 270
J	62	100		Y	186	300
K	68	110		(Y)	over 186	over 300

 Understanding Tyre Markings

Tyres have a code system moulded into their sidewall which allows you to understand their technical capabilities.

This code provides information on the tyre's construction (e.g. radial), its size, its load-carrying capacity and its speed rating.

For example, the code on a common fitment for Australian cars is:

205/65R15 95H

205	indicates the nominal section width of the tyre in millimeters (205mm).
65	indicates its aspect ratio, a comparison of the tyre's section height with its section width (65 indicates the height is 65% of its width).
R	indicates radial ply construction.
15	indicates the nominal diameter of the wheel rim (15 inches)
95H	is a symbol indicating the maximum load capacity and speed at which the tyre can be safely operated, subject to the tyre being in sound condition, correctly fitted, and with recommended inflation pressures (95 represents a maximum load of 690kg per tyre; H represents a maximum speed of 210km/h).

Passenger car tyre load ratings

Load Index	81	82	85	86	87	88	90	92	95	96
Max Load/tyre (kg)	462	475	515	530	545	560	600	630	690	710

Some light-truck tires follow the Light Truck Numeric or Light Truck High Flotation systems, indicated by the letters LT at the end instead of the beginning of the sequence, as follows:

• The tire diameter is given for High Flotation tires and omitted from Numeric tires.
  • 2-digit number: The diameter of the tire in inches.
  • x: Separator character.
• 3- or 4-digit number: The section width (cross-section) of the tire in inches. If the tire diameter is not given, section widths ending in zero (e.g., 7.00 or 10.50) indicate the aspect ratio of 92%, while section widths not ending in zero (e.g., 7.05 or 10.55) indicate the aspect ratio of 82%. These aspect ratios often vary from today's tire manufacturer specification.
• Construction of the fabric of the tire:
  • B: bias belt
  • D: diagonal
  • R: radial
• 2-digit number: Diameter in inches of the wheel rim that this tire is designed to fit.
• LT: Designates that this is a Light Truck tire.
• Load index and speed rating are sometimes not mandatory for flotation sizes, but must be for any tire approved for street and highway use.