These summer tyres have a width of 255 mm, profile of 65% and a diameter of 17". The maximum allowed speed is H (210 km/h), and describes the maximum permissible speed of the tire.
From Tyres
Yokohama Geolandar H/T (G056) (255/65 R17 114H)
Demon Tweeks
Yokohama G055 Geolandar SUV Bluearth Tyre - 255 65 17 114H