- Nottingham / Raleigh: conventional cups pressed into frame. 25x bearing balls each, top and bottom. Balls are 5/32 inch apiece. Threading is Nottingham proprietary 26 TPI.
- Birmingham: conventional bottom cup pressed into frame. Top has a "bowl" in the head tube, which houses a removable race insert. Takes 30x bearing balls each, top and bottom. Balls are 1/8 inch apiece. Threading is standard 24 TPI.
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