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 225/70 R15(2186.55 mm), 315/40 R21(2467.41 mm), 235/40 R19(2106.75 mm), 235/55 R17(2168.64 mm), 235/65 R17(2316.3 mm), 155/70 R13(1719.08 mm), 245/35 R20(2134.71 mm). You can find 195/50 R15 on 23 car models - mainly Ford, Mazda, Lancia, Mitsubishi, Renault.