235/40 R19 doesn't belong to the most popular dimensions for tyres - there are tyre models available, which can be compared to 325/30 R21, 155/60 R15, 155/65 R13. Let's break down the sizing - 40 is height of the tyre, which is calculated as 40% of the tyre width (235mm), which means the sidewall height has 94 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 mm, which is very similar to 185/50 R16(1857.94 mm), 255/45 R18(2157.33 mm), 185/65 R15(1952.5 mm), 255/60 R17(2317.87 mm), 195/45 R15(1748.3 mm), 265/30 R20(2095.44 mm), 195/60 R15(1932.08 mm). You can find 235/40 R19 on 13 car models - mainly Aston Martin, Lexus, Peugeot, Alfa Romeo, CITROËN.