Should I use snow tyres?

It is common amongst drivers of off-road vehicles to decrease the air pressure in their tires. This makes the tread of the tire spread out, creating more surface area for the tire's tread to grip the terrain. If the pressure is too low there may not be enough pressure to keep the bead on the wheel thus causing the bead to pop off the wheel. This is often referred to as "losing a bead". Beadlocks, which clamp the bead on the wheel, are often used in this case.