235/30 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 (235mm), which means the sidewall height has 70.5 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 1959.1 mm, which is very similar to 160/60 R17(1959.73 mm), 215/45 R17(1964.44 mm), 190/50 R17(1953.44 mm), 185/65 R15(1952.5 mm), 205/40 R18(1951.56 mm), 195/55 R16(1950.61 mm), 205/60 R15(1969.78 mm).