The STZ is the latest all-terrain design from Mickey Thompson and introduces many new modern features. The new tread pattern design offers excellent steering response, superior grip and more traction, making it the perfect choice for work or play. The Baja STZ is an excellent choice as an original equipment replacement tyre and is available in light truck sizes with increased load ratings.
The load rating (represented by the numerical value) is related to the maximum weight that tyre can carry. So in this case 105 would refer to a load capacity of 925kg, with most passenger vehicle load indexes range from 62 to 126.
In all instances the tyres load index must meet or exceed the value displayed on the vehicles placard.
The speed category symbol, for example 'S', indicates the maximum speed at which the tyre can carry a load corresponding to its load index. So in this case, 'S' would refer to a maximum speed of 180km/hour.
See the chart below for a full list of speed symbols and their applicable values.