195/55 R55 doesn't belong to the most popular dimensions for summer 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 - 55 is height of the tyre, which is calculated as 55% of the tyre width (195mm), which means the sidewall height has 107.25 mm. The wheel diameter is R55, which means it fits to a 55 inch/1397mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 215/85 R16(2425 mm), 285/45 R19(2321.95 mm), 225/45 R19(2152.31 mm), 295/30 R19(2072.19 mm), 225/60 R15(2045.18 mm), 295/45 R20(2430.02 mm), 225/75 R16(2337.03 mm).