245/30 R19 doesn't belong to the most popular dimensions for winter 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 - 30 is height of the tyre, which is calculated as 30% of the tyre width (245mm), which means the sidewall height has 73.5 mm. The wheel diameter is R19, which means it fits to a 19 inch/482.6mm diameter wheel. The total circumference of the tyre is 1977.95 mm, which is very similar to 180/55 R17(1978.58 mm), 215/40 R18(1976.69 mm), 245/35 R18(1975.12 mm), 195/70 R14(1974.81 mm), 185/60 R16(1974.18 mm), 225/50 R16(1983.6 mm), 245/40 R17(1972.29 mm).