Abstract: A demountable wheel optionally mountable on a hub equipped with cyclindrical studs and on a hub equipped with tapered studs. For this purpose the wheel is provided with a first ring of bores accommodating hubs having cylindrical studs and with a second ring of tapered bores accommodating hubs having tapered studs.

Abstract: A method is disclosed for assembling a high-performance low-torque anti-friction bearing assembly having numerous applications including dynamic support of a stabilized platform under severe operating conditions. The assembly consists of two rings provided with two pairs of raceways having respective rows of balls therebetween preferably under static preload. The balls and their raceways have a conformity factor of approximately 0.56 to 0.60 and the two rows of balls are in contact with a respective pair of raceways at converging similar contact angles of about 35 degrees. The ratio of the ball path diameter and the square root of the cross-sectional area of the bearing is at least 15. A bearing incorporating these features performs at high efficiency with minimal torque losses under both simultaneous and non-simultaneous axial, radial and moment load conditions and associated distortions.