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1- or 2-digit/letter combination: Speed rating; see table below. Additional marks: see subheading below. As an example, if a tire size has two sets of numbers (6-12, 5.00-15, 11.2-24), then the first number ( 5.00 -15) is the approximate width in inches, and the second number (5.00- 15 ) is the rim diameter in inches.
The status of whitewall tires versus blackwall tires was originally the reverse of what it later became, with fully black tires requiring a greater amount of carbon black and less effort to maintain a clean appearance these were considered the premium tire; since the black tires first became available they were commonly fitted to many luxury ...
By compressing the white rubber through the letter cutouts in the black outer layer, it gave the effect of raised white letter tires. Mickey Thompson claims the first raised white letter tires in 1970, [7] but many manufacturers put out similar raised white letter tires in the late 1960s and early 1970s, including Goodyear [8] and Firestone. [9]