NILS Extreme Roller wheel kit with bearing PU + ABEC-7 (x4)

The PU CLEAR wheels NILS EXTREME are made of polyurethane. The most important parameters of the wheels are hardness and diameter. The hardness of the wheels affects both the driving comfort and the grip on the ground. The PU-82A wheels offer good shock absorption and excellent adaptability to all surfaces. The diameter of the wheels has a direct impact on driving speed. Larger diameter wheels allow for higher speeds but do not guarantee the same maneuverability as smaller diameter wheels. The ABEC 7 bearing, made from high-quality carbon steel, ensures excellent hardness and durability. It is characterized by the lowest rolling resistance, which results in the highest speed according to the American Annular Bearing Engineering Committee standard, abbreviated as ABEC. An important parameter of this bearing is eccentricity, which refers to the roundness on the path inside the inner ring, measuring just 0.0025 mm.