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What does the code 145 SR -13 tire designation represent?(a) 145” width, 13” diameter, cross-ply(b) 145 mm width, 13” diameter, radial-ply(c) 145” width, 13 cm diameter, radial-ply(d) 145 mm width, 13 cm diameter, cross-plyI have been asked this question in a job interview.I want to ask this question from Wheel and Tire topic in section Engine Construction & Wheel Assembly of Automobile Engineering

Answer»

Right answer is (b) 145 mm WIDTH, 13” diameter, radial-ply

The EXPLANATION: The tire designation is of the form width (mm), SPEED rating, type of ply, and diameter (in) in the same order. So 145 SR – 13 signifies that width = W = 145 mm, speed rating = S which is up to 170 Kmph, the ply is of radial type, and diameter = 13” or 13 in = 330 mm.



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