135/80 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 - 80 is height of the tyre, which is calculated as 80% of the tyre width (135mm), which means the sidewall height has 108 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 245/40 R19(2131.88 mm), 165/70 R13(1763.06 mm), 245/50 R19(2285.82 mm), 175/65 R13(1752.07 mm), 255/30 R19(1996.8 mm), 180/60 R17(2035.12 mm), 255/40 R20(2236.81 mm).