165/65 R13 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 (165mm), which means the sidewall height has 107.25 mm. The wheel diameter is R13, which means it fits to a 13 inch/330.2mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 205/45 R17(1936.16 mm), 265/70 R16(2442.27 mm), 205/60 R15(1969.78 mm), 275/35 R20(2200.69 mm), 215/40 R16(1817.1 mm), 275/45 R19(2293.68 mm), 215/55 R16(2019.73 mm).