But some did use 120mph, such as the Rudge Ulster, the BSA Gold Star, Brough Superior and the Vincent "A" twin. In the 1930's most of the chronometric speedometers supplied to the motorcycle trade were 80mm ( 3") diameter 85mph often Non trip, but otherwise trip and 140kph for metric areas of the world. Interesting the use of metric threads.but the chronometric is a French Jaeger instrument and thus totally metric. The threaded fitting came during WW2 and used a 12mm x 1mm thread. Prewar the cable fitting attached to the speedo via what is called in the instrument trade "a Jaeger fitting". So perhaps this is the time to post some data of the Smith's instruments and ancillaries used on the Vincent motorcycle.Īll the Vincent speedometers used on the 500cc and 1000cc models were Smith's chronometric instruments, including the tachometer on the Black Lightning and Grey Flash racers. Throughout my various earlier blogs there are references to chronometric speedometers and tachometers and of course I have showcased Phil Irving's involvement with The Vincent Motorcycle. The Vincent speedometer by Denis Quinlan the velobanjogent.
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