I suppose so, except no one uses bronze bushings for these applications, probably for several reasons: 1) adjustability...race and cone bb's allow you to take up bearing slack. You could do this with adjustable conical bronze bearings and seats. That's how they do it with things like lathe headstocks, including many high precision jeweler's lathes. 2) wear. Bronze bushings are softer than steel bb's and race/cones. Bike wheels and cranks may spin at relatively low rpm's, but they do so under large loads and they are exposed to a lot of weather and road grit, which would screw up bronze bushings.