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Know Your Tyre Sidewall Markings

140
This is the tyre width across the tread, measured in mm
170
The aspect ratio is calculated as the sidewall height expressed as a percentage of the tyre width. So, a tyre with an aspect ratio of 70 is a tyre whose sidewall height is equal to 70% of its width (98mm here).
20
"-" Indicates Bias/Nylon tyre (lf there is an “R” in place of “-”, that means it is a Radial tyre). R = Radial Construction
17
This is the diameter in inches of the rim of the wheel that the tyre has been designed to fit.

66 – Load index
is a numerical code which shows the maximum load that the tyre can carry
S – Speed index
is the maximum speed that the tyre can endure. Speed index ‘S’ indicates that the tyre can run up to a speed of 180km/h.

ISI
Approval service description for India
Rotation direction and fitment position (Front/Rear)
TThe direction of a tyre’s rotation and the position in which it must be fitted in
R00192152615
Indicates factory code, size code, week of manufacture, year of manufacture.
‘26’ indicates week of manufacture
‘15’ indicates year of manufacture