Roadstone Winguard Sport is a winter tyre made in total of 16 sizes, ranging from R15 to R15 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/40 R18 is 40mm wider than the narrowest dimension (185) and 50mm narrower than the widest one (275). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (225mm), which results in 90mm sidewall height. In
225/40 R18, Winguard Sport usually competes against
Blizzak LM-005, which is a tyre from
Bridgestone with a rating of 87%, compared to 5% of the
Roadstone in question.
