Apollo Aspire XP Winter is a winter tyre made in total of 20 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 235/60 R18 is 20mm wider than the narrowest dimension (215) and 10mm narrower than the widest one (245). This tyre profile of 60 means the sidewall height of the tyre is 60% of the tyre width (235mm), which results in 141mm sidewall height. In 235/60 R18, there is only one possible speed index for Apollo Aspire XP Winter - "H", which is good for speeds up to 210 km/h. In 235/60 R18, Aspire XP Winter usually competes against Wintrac Pro, which is a tyre from Vredestein with a rating of 81%, compared to 82% of the Apollo in question.