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Have been wondering about this for over two years and thought to make a post of it.

Photo is of the underside of the bottom bracket of a 1940's era Terrot one-speed machine with 650B wheels.



Have a a gander at the area outboard of the adjustable bottom bracket cup/ lockring and inboard of the left hand crank arm.

There is a sleeve/bushing there over the axle which appears to be secured by a set screw.

Do you know its purpose?

Cycle was discussed in this forum thread:

http://m.bikeforums.net/showthread.p...ghlight=terrot

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