335/25 R20 doesn't belong to the most popular dimensions for winter tyres - there are 1 tyre models available, which can be compared to 155/60 R15, 170/60 R17, 160/60 R14. Let's break down the sizing - 25 is height of the tyre, which is calculated as 25% of the tyre width (335mm), which means the sidewall height has 83.75 mm. The wheel diameter is R20, which means it fits to a 20 inch/508mm diameter wheel. The total circumference of the tyre is 2122.15 mm, which is very similar to 275/35 R19(2120.89 mm), 225/60 R16(2124.97 mm), 275/40 R18(2127.49 mm), 245/45 R18(2129.06 mm), 275/30 R20(2114.29 mm), 205/65 R16(2113.98 mm), 235/35 R20(2112.72 mm). There are multiple speed indexes available for winter tyres in 335/25 R20: W(270km/h). The same goes for weight indexes: 103.