175/75 R16 doesn't belong to the most popular dimensions for summer tyres - there are 13 tyre models available, which can be compared to 185/55 R16, 185/50 R16, 195/65 R16. 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 2101.41 mm, which is very similar to 235/45 R18(2100.78 mm), 265/40 R18(2102.35 mm), 215/55 R17(2099.53 mm), 265/35 R19(2098.9 mm), 205/70 R15(2098.58 mm), 325/25 R20(2106.44 mm), 235/40 R19(2106.75 mm). There are multiple speed indexes available for summer tyres in 175/75 R16: R(170km/h), T(190km/h). The same goes for weight indexes: 99, 101.