Pete Geurds wrote:
> From: "gabriel l romeu" <romeug@comcast.net>
> To: <classicrendezvous@bikelist.org>
> Sent: Monday, March 05, 2007 8:36 AM
> Subject: [CR]in quest of raleigh BBs,
>
>
>> It seems. if the rumours that these frames are indeed Raleigh, and
>> if the proprietary 26tpi sizing are correct, I will be needing a pair
>> of bottom brackets for what appears to be an early 70's grand sport
>> and professional.
>> in rideable condition please....
>
> The Professional will be regular BSC threading.
> The Gran Sport being a 531 tubed machine should use BSC threading too.
> In my limited experience, in dealing with Raleighs:
> If the bottom bracket looks like the BB found on most other bikes than
> it's most likely normal BSC threading.
> If it looks like fixed cup is sunk into BB shell, and has 5/8'' wrench
> flats, it should be a Raleigh thread (26tpi).
>
> FWIW:
> My 78 Super Grand Prix, a notch below the Super Course, uses a Raleigh
> bottom bracket.
> Helpful to know if wanting to do a 3 speed conversion on a lower end
> 10 speed bike.
>
In my also limited experience, all Super Course or higher are BSC threaded.
I once was told all Worksop production was BSC threaded and Nottingham
production was Raleigh thread.
The Worksop made Raleigh Grand Prix, at least the two I have owned a
1968 and a 1969 were BSC threaded.
Canadian made Grand Prix 1975 to 1979 were BSC threaded, to add to the
confusion these have a Nottingham headbadge, may or may not have a "Made
in Canada" decal, but will not have a "Made in England" decal.
All others I have seen or heard about were Raleigh threaded.
That said when it comes to Raleigh production there are no hard and fast
rules, but then that's part of the fun. :-)
Marcus Coles
London, Ontario, Canada