> I worked out what was needed then rang ORS who told me I couldn't
> have what
> I wanted but that I could achieve the same ratio by other means i.e. not
> having a pinion that went as low as 17 teeth (I think) to go with the 6
> start spiral but I could get 20 to go with the 5 start spiral. Basically I
> did it from informed advice of a supplier.
Thanks, Graham.
> There are many
> vehicles which use
> the Laycock OD unit, not only the LBC's but Volvo's and Ford Transits and
> others, so there are numerous alternatives for the speedo drives that are
> not listed in Triumph books.
Exactly.
BTW, A-type ODs do not have a replaceable spiral gear, it's built into the
annulus. AFAIK they only had one driven gear as well, basically the
standard at the time was to modify the speedo head to match the gear ratios
and tire sizes, the speedo cable was always driven at 2.5 times the output
shaft speed. J-types (and perhaps D-types) had the interchangeable spiral
gear and driven gear.
Randall
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