245/35 R21 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 - 35 is height of the tyre, which is calculated as 35% of the tyre width (245mm), which means the sidewall height has 85.75 mm. The wheel diameter is R21, which means it fits to a 21 inch/533.4mm diameter wheel. The total circumference of the tyre is mm, which is very similar to 225/75 R16
(2337.03 mm), 235/45 R18
(2100.78 mm), 235/55 R19
(2328.23 mm), 235/70 R16
(2310.33 mm), 160/60 R14
(1720.34 mm), 245/40 R18
(2052.09 mm), 165/65 R14
(1791.02 mm).
