215/45 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 (215mm), which means the sidewall height has 96.75 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 275/55 R19(2466.46 mm), 215/65 R15(2075.02 mm), 285/35 R18(2063.08 mm), 215/85 R16(2425 mm), 285/45 R19(2321.95 mm), 225/45 R19(2152.31 mm), 295/30 R19(2072.19 mm). You can find 215/45 R17 on 38 car models - mainly Toyota, Opel, Alfa Romeo, Subaru, Ford.