255/70 R16 doesn't belong to the most popular dimensions for summer tyres - there are 9 tyre models available, which can be compared to 165/80 R13, 155/70 R19, 155/80 R13. Let's break down the sizing - 70 is height of the tyre, which is calculated as 70% of the tyre width (255mm), which means the sidewall height has 178.5 mm. The wheel diameter is R16, which means it fits to a 16 inch/406.4mm diameter wheel. The total circumference of the tyre is 2398.29 mm, which is very similar to 255/65 R17(2397.98 mm), 255/60 R18(2397.66 mm), 255/55 R19(2397.35 mm), 255/50 R20(2397.04 mm), 235/65 R18(2396.09 mm), 285/45 R20(2401.75 mm), 235/55 R20(2408.03 mm). There are multiple speed indexes available for summer tyres in 255/70 R16: H(210km/h), Q(160km/h), R(170km/h), S(180km/h), T(190km/h). The same goes for weight indexes: 108, 111, 115, 120.