We can further define bearings in five distinct groups: Placing a 30 kilo weight beyond the crank spindle where pedal forces reside for one million cycles is an example of bottom bracket bearing axial load testing. Combined load testing best replicates real world bicycle use. Radial Load is force applied directly on top of the outer bearing race, perpendicular to the shaft the inner bearing race is spinning on.Īxial or Thrust Loads are similar and describe force applied to the side of a bearing, parallel to the shaft the inner bearing race is spinning on.Ĭombined Loads are multi-directional forces, both radial and axial, applied simultaneously to the bearing and shaft the inner bearing race is spinning on. The loads that a bearing can be expected to bear are defined as follows: Bringing this definition more into focus with regard to bicycle use, a bearing constrains relative motion to motion in only a desired plane or direction, and at the same time reduces friction between moving parts. The word “bearing” at its most simple definition is a machine element that allows one part to bear the weight or load of another.
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