225/50 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 (225mm), which means the sidewall height has 112.5 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 180/65 R16(2011.88 mm), 255/45 R17(2077.54 mm), 185/65 R14(1872.7 mm), 255/55 R20(2477.15 mm), 195/40 R17(1846.63 mm), 265/30 R19(2015.65 mm), 195/60 R14(1852.28 mm).