255/65 R17 doesn't belong to the most popular dimensions for summer tyres - there are 17 tyre models available, which can be compared to 205/40 R18, 190/50 R17, 205/65 R15. Let's break down the sizing - 65 is height of the tyre, which is calculated as 65% of the tyre width (255mm), which means the sidewall height has 165.75 mm. The wheel diameter is R17, which means it fits to a 17 inch/431.8mm diameter wheel. The total circumference of the tyre is 2397.98 mm, which is very similar to 255/70 R16(2398.29 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 255/65 R17: H(210km/h), Q(160km/h), S(180km/h), T(190km/h), V(240km/h). The same goes for weight indexes: 110, 114, 119. You can find 255/65 R17 on 5 car models - mainly Nissan, Isuzu, Mercedes-Benz, Toyota.