235/50 R17 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 (235mm), which means the sidewall height has 117.5 mm. The wheel diameter is R17, which means it fits to a 17 inch/431.8mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 255/70 R18(2557.88 mm), 195/55 R20(2269.8 mm), 265/35 R21(2258.49 mm), 195/70 R15(2054.6 mm), 265/45 R21(2425 mm), 205/45 R16(1856.37 mm), 265/70 R16(2442.27 mm).