225/45 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 - 45 is height of the tyre, which is calculated as 45% of the tyre width (225mm), which means the sidewall height has 101.25 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 225/40 R18(2001.82 mm), 285/65 R17(2520.5 mm), 225/55 R17(2134.08 mm), 295/35 R21(2324.46 mm), 225/65 R17(2275.46 mm), 315/35 R20(2288.65 mm), 235/40 R18(2026.96 mm). You can find 225/45 R17 on 77 car models - mainly Mercedes-Benz, Alfa Romeo, Volkswagen, BMW, Seat.