245/75 R16 doesn't belong to the most popular dimensions for summer tyres - there are 13 tyre models available, which can be compared to 185/50 R16, 175/75 R16, 185/55 R16. Let's break down the sizing - 75 is height of the tyre, which is calculated as 75% of the tyre width (245mm), which means the sidewall height has 183.75 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 2431.28 mm, which is very similar to 265/55 R19(2431.91 mm), 295/45 R20(2430.02 mm), 265/50 R20(2428.45 mm), 245/70 R17(2434.11 mm), 265/60 R18(2435.36 mm), 265/45 R21(2425 mm), 215/85 R16(2425 mm). There are multiple speed indexes available for summer tyres in 245/75 R16: Q(160km/h), S(180km/h), T(190km/h). The same goes for weight indexes: 109, 111, 114, 115, 120.