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+--- Thread: Speedo drive (/showthread.php?tid=6273)
Speedo drive - Tiger - 18-06-2021
Hi Gents
Could someone advise with the thread specification.
The brass insert in the gearbox what is the connecting speedo cable size.
The part the cable connector screws onto?
1936 Mk2 Ruby with standard gearbox
Regards
Tim
RE: Speedo drive - Robert Foreman - 18-06-2021
¾" x 26t.p.i.
RE: Speedo drive - Tiger - 18-06-2021
Thanks Robert.
Has the thread form got a name ?
RE: Speedo drive - Robert Foreman - 18-06-2021
Tim,
It's a British Standard Brass thread.
RE: Speedo drive - Robert Leigh - 18-06-2021
Robert,
Is that the same as a Cycle Engineers thread?
RE: Speedo drive - Chris KC - 19-06-2021
Not quite Robert
BSB
BSB.JPG (Size: 113.3 KB / Downloads: 90)
CEI (Cycle Engineers' Institute)
CEI.JPG (Size: 136.99 KB / Downloads: 90)
RE: Speedo drive - Stuart Giles - 19-06-2021
as well as the other differences visible in the charts, the CEI threads all have a 60 degree thread angle; BSB has a 55 degree angle in common with most other Brit threads.