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 225/60 R17(2204.77 mm), 305/30 R20(2170.84 mm), 235/35 R19(2032.92 mm), 235/45 R20(2260.38 mm), 235/60 R17(2242.47 mm), 155/60 R15(1781.28 mm), 245/30 R20(2057.74 mm).