Print Page - 1954 B33 Fork Nut Thread

Title: 1954 B33 Fork Nut Thread
Post by: AdrianW on 28 Apr, 2020, 14:06

Dear All,
I am in the process of rebuilding my forks and have a small supplier issue.. Could anyone confirm the correct thread pitch for the top fork nuts for the swinging arm "B" series please?. Mine has 1 1/16" 20 TPI thread.. I don't think they are incorrect , could someone please confirm?

Ta,

Adrian
Bristol UK

Title: Re: 1954 B33 Fork Nut Thread
Post by: JulianS on 28 Apr, 2020, 14:31

Yes 1 1/16 inch x 20 tpi Cycle thread.

Title: Re: 1954 B33 Fork Nut Thread
Post by: AdrianW on 28 Apr, 2020, 15:35

Thanks Julian,
Just wanted to be sure... !!

Cheers,
Adrian
Bristol UK

Title: Re: 1954 B33 Fork Nut Thread
Post by: AdrianW on 29 Apr, 2020, 17:34

Just a thought...
Would I be right in assuming that the top nuts for the "C" series were smaller (1") and the later bikes (1968 on) were larger?
Just curious...

Thanks,
Adrian Bristol UK

Title: Re: 1954 B33 Fork Nut Thread
Post by: JulianS on 29 Apr, 2020, 18:13

The C15s and Bantams with lightweight forks had different threads.

From 1969 the A and B series got unified threads, the fork top nuts being 1 1/16 inch x 28 tpi.

BSA Owners' Club Workshop Discussions

The BSA Workshop => Singles => Topic started by: AdrianW on 28 Apr, 2020, 14:06