Loads, Stresses, and deflections in Bicycle Frames

Abstract

A bicycle frame has been analysed as a three-dimensional framework and stresses and deflections predicted using a finite element computer program. Theoretical results for simple loading case were compared with strain gauge measurements in laboratory tests. More complex loading cases representing common cycle racing situations were analysed. The largest stresses in the frame were bending stresses. Stresses in the region of 300—400 MN/m 2 were predicted in the down tube and right chain stay during starting and stresses of about 250 MN/m 2 at the front of the top tube and down tube during severe braking.