1. Product Overview B55-60 non-standard single-row open deep groove ball bearing, dimension 55mm inner bore × 90mm outer diameter × 18mm width, dedicated matching CVT intermediate pulley and gearbox auxiliary shaft assemblies. Open design without rubber seals, equipped with stamped low-carbon steel cage and C0 standard internal clearance. It bears heavy radial load and slight two-way axial load, running stable and low-noise under long-time high-speed variable vibration and