Ratukas Nils Extreme Wheel Set, 70 mm x 24 mm x 70 mm, 4 vnt.

PU castors BLACK MATTE NILS EXTREME are made of polyurethane. The most important parameters of the wheels are hardness and diameter. The hardness of the wheels determines both driving comfort and adhesion to the ground. PU-82A wheels provide good shock absorption and excellent adaptation to any surface. The diameter of the wheels has a direct effect on the speed of the ride. Wheels with a larger diameter allow you to achieve higher speeds, but they do not guarantee as much maneuverability as wheels with a smaller diameter. ABEC 9 bearing, made of high quality carbon steel, which provides excellent hardness and durability. It is characterized by the lowest rolling resistance, which translates into the highest speed in the American Annular Bearing Engineering Committee standard, abbreviated ABEC. An important parameter of this bearing is the eccentricity, i.e. roundness on the track in the inner ring, which is only 0.0012mm.