295/45 R20 doesn't belong to the most popular dimensions for summer tyres - there are 8 tyre models available, which can be compared to 160/70 R17, 205/40 R17, 195/40 R17. Let's break down the sizing - 45 is height of the tyre, which is calculated as 45% of the tyre width (295mm), which means the sidewall height has 132.75 mm. The wheel diameter is R20, which means it fits to a 20 inch/508mm diameter wheel. The total circumference of the tyre is 2430.02 mm, which is very similar to 245/75 R16(2431.28 mm), 265/50 R20(2428.45 mm), 265/55 R19(2431.91 mm), 245/70 R17(2434.11 mm), 265/45 R21(2425 mm), 215/85 R16(2425 mm), 265/60 R18(2435.36 mm). There are multiple speed indexes available for summer tyres in 295/45 R20: V(240km/h), W(270km/h), Y(300km/h). The same goes for weight indexes: 110, 114.