The Solus KR21 is Kumho tyre's Standard Touring All-Season tyre developed for the drivers of family coupes, sedans and minivans, as well as crossover and sport utility vehicles. The Solus KR21 is designed to offer a combination of long wear, low noise and good ride with competent handling and all-season traction, even in light snow.
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.