Question

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-ply

I 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 1

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.