06-06-2018, 10:28 AM
(This post was last modified: 06-06-2018, 10:33 AM by Bob Culver.)
Some other makes with 2 bearing cranks got by with a single bearing at each end, one a ball to locate and one a roller to allow for expansion. The fatigue life of rolling races was hard to predict in automotive applications and the Seven errs on the side of caution. The ratings of modern bearings are much higher than 1920s, hence the meagre bearings in moderns. I am sure two ball races in the front would do fine, at reduced cost.