This is a measure of a car tyre. It is a combination of units and ratios that is enough to drive most people nuts!
175 refers to the width of the tyre (in millimetres) from sidewall to sidewall.
15 refers to the diameter of the wheel rim (in inches).
75 is the ratio (in percent) of the profile to the width.
The profile is the length from the wheel rim to the edge of the tyre.
I suspect the r means a radial tread but I am not sure about that.
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175 / 80 = 2 r 15 80 / 15 = 3 r 5 15 / 5 = 3 r 0 gcf of 80 and 175 is 5.
10 R 15
25 to 150 = r to 75 25/150 = 1/6 1/6 times 75 equals r.
1 R 55
The circumference of a circle with a radius of 175 millimeters is about 1,100 mm (C = r x 2 x Pi).