255/70 R15 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 - 70 is height of the tyre, which is calculated as 70% of the tyre width (255mm), which means the sidewall height has 178.5 mm. The wheel diameter is R15, which means it fits to a 15 inch/381mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 255/45 R17
(2077.54 mm), 185/65 R15
(1952.5 mm), 255/55 R20
(2477.15 mm), 195/45 R15
(1748.3 mm), 265/30 R20
(2095.44 mm), 195/60 R15
(1932.08 mm), 265/40 R18
(2102.35 mm).
