175/75 R16 doesn't belong to the most popular dimensions for tyres - there are tyre models available, which can be compared to 325/30 R21, 155/60 R15, 155/65 R13. Let's break down the sizing - 75 is height of the tyre, which is calculated as 75% of the tyre width (175mm), which means the sidewall height has 131.25 mm. The wheel diameter is R16, which means it fits to a 16 inch/406.4mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 255/70 R15(2318.5 mm), 195/55 R16(1950.61 mm), 265/35 R19(2098.9 mm), 195/70 R14(1974.81 mm), 265/45 R18(2185.61 mm), 205/40 R18(1951.56 mm), 265/65 R18(2518.61 mm).