The PA speedo has a flex speed of 2240. The chronometric has a flex speedo of 1910. If you have the wrong gearing, 1910/2240 or 2240/1910 will be the factor by which it is wrong. Riding past one of those signs which tell you whether you are breaking the speed limit or not is a good way to check.
Ariel first fitted the chronometric speedo in 1939 when it was driven from the front wheel. I suspect you may have postwar gears in a prewar gearbox shell.
WANTED - BAP speedometer driven gear
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paul.jameson
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Re: WANTED - BAP speedometer driven gear
Paul Jameson
34 OHC 4F 600 (project), 35 LG (project), 37 RH500, 52 ex ISDT KHA, 54 KH(A), 75 Healey 1000/4.
Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser (over a 25 year period).
Now Archivist (but not Machine Registrar), Gauges and Clocks Spares Organiser.
34 OHC 4F 600 (project), 35 LG (project), 37 RH500, 52 ex ISDT KHA, 54 KH(A), 75 Healey 1000/4.
Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser (over a 25 year period).
Now Archivist (but not Machine Registrar), Gauges and Clocks Spares Organiser.
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