Hughethornton@aol.com wrote:
> In a message dated 14/02/2006 19:34:54 GMT Standard Time, wnwires@htc.net
> writes:
>
> Subject line pretty states the issue. When did the first roller
> bearing model start to appear? I have tried my best to find out, but
> find no definitive dating. Which side of 1980?
> Dunno what an A9 is, or roller bearing what. If this refers to the
> Stronglight roller (needle?)bearing bottom brackets, I bought one in the 1960's,
> certainly before 1965
The A9 is a roller bearing headset, with cylindrical rollers in a conic-section cage. These ran on conic-section steel races that floated in alloy cups (e.g. see eBay item #7219567109). The B10 was the same headset and bearings with plastic cups, but in my experience these tended to flex too much for my taste. The Delta was the same headset and bearings with thicker alloy cups and O-ring seals -- very nice!
I don't remember seeing any of them until the early 80s.
--
John (john@os2.dhs.org)
Appleton WI USA