Kumho Crugen HP91 is a summer tyre made in total of 50 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/60 R18 is 10mm wider than the narrowest dimension (215) and 50mm narrower than the widest one (275). This tyre profile of 60 means the sidewall height of the tyre is 60% of the tyre width (225mm), which results in 135mm sidewall height. In 225/60 R18, there is only one possible speed index for Kumho Crugen HP91 - "H", which is good for speeds up to 210 km/h. In 225/60 R18, Crugen HP91 usually competes against ZEON 4xS Sport, which is a tyre from Cooper with a rating of 36%, compared to 0% of the Kumho in question.