Hardly any piece of sports equipment is exposed to such stresses and strains as a mountain board. Particularly when, similar to kite surfing, a tube kite is used with it. Professional riders manage jumps of up to 8 m high and 15 m wide and ride up to 70 km/h. The mountain boards's axle is exposed to extreme stresses in this case. On the one hand the bearing mechanism must work with as little play as possible, but on the other also be resistant to dust, sand and salt water. The bearing mechanism should not create any additional weight either. Flange bearings made of iglidur® J meet all these requirements here.