265/75 R15 doesn't belong to the most popular dimensions for summer tyres - there are 0 tyre models available, which can be compared to 155/60 R15, 170/60 R17, 160/60 R14. Let's break down the sizing - 75 is height of the tyre, which is calculated as 75% of the tyre width (265mm), which means the sidewall height has 198.75 mm. The wheel diameter is R15, which means it fits to a 15 inch/381mm diameter wheel. The total circumference of the tyre is 2445.73 mm, which is very similar to 275/40 R22(2446.67 mm), 265/70 R16(2442.27 mm), 265/65 R17(2438.82 mm), 275/45 R21(2453.27 mm), 265/60 R18(2435.36 mm), 245/70 R17(2434.11 mm), 265/55 R19(2431.91 mm). There are multiple speed indexes available for summer tyres in 265/75 R15: T(190km/h). The same goes for weight indexes: 112, 113.