Depending on the discipline you practise and what grip you want, you can choose from various MTB tyre models based on their characteristics.
The knobs on the tread depend on the type of terrain you usually tackle with your MTB. Smaller knobs mean less grip on rocks and stones but also a smoother bike and a longer tyre life.
While a more pronounced knob is ideal for bumpy or muddy terrain.
You should also bear in mind the size of the tread on an MTB tyre. So it is important to know the diameter of the wheel on your mountain bike. There are two main dimensions,which are expressed in inches: 27.5” and 29”.