Here's the decoder ring:

285 is the width of the tire in milimeters

75 is the aspect ratio, which is the height of the sidewall section compared to the width of the tire. Since yours is 75 then the tire section is 75% as tall as it is wide. Short sidewalls tend to provide for better handling whereas taller sidewalls tend to give a smoother ride. For a specific tire width, the smaller this number, the shorter the sidewall.

R means radial tire

16 means it fits a 16" rim

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