Vintage Components - Brompton bottom bracket parts
Brompton bottom bracket parts on this page: Brompton English-threaded cups
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Brompton English-threaded cups. Used, $20.00/set
These cups came from an old Norman bike, probably made in the 1950s, perhaps even older than that.
Brompton English-threaded cups.
The bearing surfaces
Close-up of the fixed cup
The fixed cup from a different angle
Close-up of the adjustable cup and lock ring.
The adjustable cup turned around for another view