Kumho Ecsta PS91 is a summer tyre made in total of 48 sizes, ranging from R18 to R18 - this particular dimension is R19, which means it fits to a 19 inch/482.6mm diameter wheel. 295/30 R19 is 70mm wider than the narrowest dimension (225) and -20mm narrower than the widest one (275). This tyre profile of 30 means the sidewall height of the tyre is 30% of the tyre width (295mm), which results in 88.5mm sidewall height. In 295/30 R19, there is only one possible speed index for Kumho Ecsta PS91 - "Y", which is good for speeds up to 300 km/h. In 295/30 R19, Ecsta PS91 usually competes against P ZERO, which is a tyre from Pirelli with a rating of 61%, compared to 48% of the Kumho in question.