Giti Sport S1 is a summer tyre made in total of 37 sizes, ranging from R16 to R16 - this particular dimension is R18, which means it fits to a 18 inch/457.2mm diameter wheel. 225/45 R18 is 30mm wider than the narrowest dimension (195) and 70mm narrower than the widest one (295). This tyre profile of 45 means the sidewall height of the tyre is 45% of the tyre width (225mm), which results in 101.25mm sidewall height. In 225/45 R18, there is only one possible speed index for Giti Sport S1 - "Y", which is good for speeds up to 300 km/h. In 225/45 R18, Sport S1 usually competes against Speed-Life 3, which is a tyre from Semperit with a rating of 47%, compared to 0% of the Giti in question. Latest test in 225/45 R18 was held by AutoMotorSport in 2020, where Sport S1 received rating "Sufficient" and finished on the 11. place. It was tested on a BMW 3 series.
