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The “R” denotes that the tyre is of radial type construction.

The first section of this number indicates the tyre’s section width, in this case 120mm.There are a number of different speed and load ratings, and their values in MPH and kilograms respectively are shown here.The majority of tyres for sports bike contain the speed and load ratings in brackets.However, in all cases, the first 3 digits represent the sidewall width in millimeters.The second pair of digits are what is known as the "aspect ratio".

This represents the height of sidewall from the wheel to the top of the tread.