195/50 R15 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 - 50 is height of the tyre, which is calculated as 50% of the tyre width (195mm), which means the sidewall height has 97.5 mm. The wheel diameter is R15, which means it fits to a 15 inch/381mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 185/60 R16(1974.18 mm), 255/55 R19(2397.35 mm), 190/55 R17(2013.13 mm), 255/70 R18(2557.88 mm), 195/60 R14(1852.28 mm), 265/35 R21(2258.49 mm), 195/70 R16(2134.4 mm). You can find 195/50 R15 on 23 car models - mainly Ford, Mazda, Lancia, Mitsubishi, Renault.