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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]
In this system a tire had a letter, optionally followed by "R" for radial tires, followed by the aspect ratio, a dash and the diameter – C78-15 or CR78-15 for bias and radial, respectively. Each diameter of rim had a separate sequence of load ratings; thus, a C78-14 and a C78-15 are not the same width.
Later, entirely black tires became available, the still extant white sidewalls being covered with a somewhat thin, black colored layer of rubber. Should a black sidewall tire have been severely scuffed against a curb, the underlying white rubber would be revealed; it is in a similar manner that raised white letter (RWL) tires are made.
[6] [7] Goodyear and comparable bias-belted tires began appearing as standard or optional equipment on most 1969-model passenger cars [4] and nearly all 1970 through 1974 models. The most common version of the Polyglas on muscle cars of that era with raised white lettering. [ 8 ]
The 10mm area-of-interest also means that bulge measurement is limited to a small portion of the tire. Capacitive sensors employ void filtering to remove the effect of the voids between the tread lugs in radial runout measurement, and letter filtering to remove the effect of raised letters and ornamentation on the sidewall.
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