This summer tire from Yokohama comes with a width of 275 mm, profile of 1% and a diameter of 15". The speed index is H (210 km/h), and describes the maximum permissible speed of the tire.
From Protyre
275/55R20 117H XL Yokohama Geolandar A/T G015 275/55R20 117H XL | Protyre - Van Tyres
Demon Tweeks
Yokohama Geolandar A/T G015 Tyre - 275 55 20 117H XL Extra Load