Re: Dimensions of the two nuts for the Smiths Speedometer
My understanding is that Smiths Industries bought the patent for their speedometers from Jaeger of France and therefore the 2 nuts that hold the speedo on are the only metric fasteners on British Motorcycles.
Re: Dimensions of the two nuts for the Smiths Speedometer
I actually thought they were 0BA...However, I keep reading/hearing that they are metric, based on the fact that Jaeger speedos (from where the Smiths licence came) were manufactured in France...Ian
Re: Dimensions of the two nuts for the Smiths Speedometer
Me too and I was also getting influenced by the 'French Connection' 0BA makes better sence as it's the same tpi and diameter with an imperal hex. I doubt there were many metric spanners back then. Available here in brass or steel https://www.ba-bolts.co.uk/brassnut.html
Ron
Re: Dimensions of the two nuts for the Smiths Speedometer
Smiths were initially agents for Jaeger in the UK and it was a requirement that there should be full parts interchangeability with the Continental-manufactured instruments. This would have included cases and bezels and meant that their parts could be used on foreign vehicles as well as bought-in by Jaeger where needed.
However, UK vehicle manufacturers would have expected imperial hexagons on any fitings, hence the odd combination.
