155/80 R13 doesn't belong to the most popular dimensions for summer tyres - there are 24 tyre models available, which can be compared to 160/60 R17, 165/65 R15, 175/65 R14. Let's break down the sizing - 80 is height of the tyre, which is calculated as 80% of the tyre width (155mm), which means the sidewall height has 124 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 1816.47 mm, which is very similar to 215/40 R16(1817.1 mm), 185/60 R14(1814.58 mm), 165/60 R15(1818.98 mm), 195/50 R15(1809.56 mm), 175/70 R13(1807.04 mm), 195/45 R16(1828.09 mm), 175/55 R15(1801.7 mm). There are multiple speed indexes available for summer tyres in 155/80 R13: P(km/h), Q(160km/h), R(170km/h), S(180km/h), T(190km/h). The same goes for weight indexes: 79, 83, 85, 90, 91. You can find 155/80 R13 on 15 car models - mainly Fiat, Hyundai, Subaru, Daihatsu, Chevrolet.