145/65 R15 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 - 65 is height of the tyre, which is calculated as 65% of the tyre width (145mm), which means the sidewall height has 94.25 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 205/55 R16
(1985.17 mm), 275/30 R21
(2194.09 mm), 205/75 R16
(2242.78 mm), 275/40 R21
(2366.88 mm), 215/45 R18
(2044.23 mm), 275/55 R19
(2466.46 mm), 215/65 R15
(2075.02 mm). There are multiple speed indexes available for summer tyres in 145/65 R15: H
(210km/h), T
(190km/h). The same goes for weight indexes: 72.