Hardness of rubber:
The softer the tyre it is, the more grip on wet terrain will be good. On a dry and terrain The hardness of the rubber (choice of terrain) As a general rule for cross, enduro and trial, the softer the rubber, the better the grip on wet terrain. It is better to choose a hard rubber tyre for dry and stony terrain.
Direction of rotation
Most manufacturers of all terrain tyres make this distinction on their tyres. Be careful during mounting.