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Motorcycle Discussions => British Bikes => Topic started by: tractorman on October 30, 2009, 04:23:18 PM

Title: Smiths chronometric speedo
Post by: tractorman on October 30, 2009, 04:23:18 PM

I have a Smith chronometric speedo with a rather poor condition dial and by a stroke of luck I happen to have a brand new replacement dial, however only one of the 4 fixing screws is present, and I am struggling to identify what the screws are, they measure 0.077" OD and are 56 tpi of near abouts which doesn’t relate to any thread standard I know, and ideas what they are and more importantly, where can I get some ?

Title: Re: Smiths chronometric speedo
Post by: Goldy on October 30, 2009, 04:43:59 PM

Speedograph repair Smiths but I dont know if they sell spares. Worth a try though. http://www.speedograph-richfield.com/

Title: Re: Smiths chronometric speedo
Post by: stu.andrews on October 31, 2009, 10:24:33 AM

Check out Mr Pople at Frimley, Hants tel no.  01252-329826.  He's very helpful & has done some good repairs for me.

Title: Re: Smiths chronometric speedo
Post by: L.A.B. on October 31, 2009, 11:46:36 AM

Quote

I am struggling to identify what the screws are, they measure 0.077" OD and are 56 tpi of near abouts which doesn’t relate to any thread standard I know,

That's because the screws are METRIC size!

It was the French Jaeger company that originally developed the Chronometric design, as a result of that Smiths (who bought Jaeger) Chronometrics have metric dimensions and metric screw threads.
http://velobanjogent.blogspot.com/2008/03/smiths-chronometric-speedometer-and_21.html