155/65 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 - 65 is height of the tyre, which is calculated as 65% of the tyre width (155mm), which means the sidewall height has 100.75 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 235/50 R18
(2174.61 mm), 235/60 R18
(2322.27 mm), 155/65 R14
(1750.18 mm), 245/35 R18
(1975.12 mm), 160/70 R17
(2060.26 mm), 245/40 R21
(2291.48 mm), 165/80 R13
(1866.73 mm).
