Nankang Sportnex AS-2+ is a summer tyre made in total of 76 sizes, ranging from R16 to R16 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 245/40 R19 is 70mm wider than the narrowest dimension (175) and 40mm narrower than the widest one (285). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (245mm), which results in 98mm sidewall height. In 245/40 R19, there is only one possible speed index for Nankang Sportnex AS-2+ - "Y", which is good for speeds up to 300 km/h. In 245/40 R19, Sportnex AS-2+ usually competes against Ultrac Vorti, which is a tyre from Vredestein with a rating of 0%, compared to 20% of the Nankang in question.