275/65 R20 doesn't belong to the most popular dimensions for winter 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 (275mm), which means the sidewall height has 178.75 mm. The wheel diameter is R20, which means it fits to a 20 inch/508mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 235/55 R19
(2328.23 mm), 235/70 R16
(2310.33 mm), 160/60 R14
(1720.34 mm), 245/40 R17
(1972.29 mm), 165/65 R14
(1791.02 mm), 245/45 R20
(2288.65 mm), 175/60 R14
(1776.88 mm).
