I'm looking for a speedo for my M20.
Do you know if it's possible to buy a reproduction and where ?

Thank you for your answers

Regards

Claude

email (option): matrot.sandra@neuf.fr

There are no reproductions of chronometric speedometers (which the British Smiths company made in the UK under licence from Jaeger in France). It's hard to imagine, bearing in mind the complication and level of engineering inside that they could be made at an affordable price.

Even by the 1960s, they had become too expensive to make and were replaced by the less accurate 'SSM' magnetic speedos.

Unless we are lucky, most of us can only try to find an original 'donor' instrument to be snet to a specialist for exchange or reconditioning.

I purchased mine about 6 months ago from a guy in Iraq, he has 86 NOS speedos still in there cardboard boxes left behind by the British after WW2. I paid 200 pounds but he is now asking about 500 pounds I think. If you do buy one from him you need to drill out the smiths aluminium rivet holding the bezel in place and strip the whole thing down to clean out the grease that has hardened over the 75 years of never being used. Don't try and use it first or you will damage it, I stripped mine down and cleaned it all myself after watching some youtube clips, its fairly straight forward.

Regards

Stuart

email (option): deepsea@vol.net

Hello Claude,

A year ago I found a speedo repro which (to my surprise) turned out to have the correct rotation for the speedo drive on the front wheel.

It was sold by a seller in India, and it was simply listed as having an M12 x 1 fitting. Most are listed as M18.

I intended it to be merely a" place keeper" until I could find the right thing, but it turns out it works just fine. I had to use a different bracket as the two studs at the rear were on a 90 degree axis to those of the original, but that wasn't hard to do. I'd owned it for several months before I connected it and realized it works, otherwise I'd have bought a few more! It doesn't have a trip meter.

It works, it seems to register something approximately right as to speed and it was cheap.

Has any one else tried this?

Here's a link that I think is to the same item. No guarantees, though!

eBay.com: eBay item number:292784124419 (this one's being sold with a tachometer. They might well separate them if you ask.)

Allan

email (option): allanmatchless@yahoo.com

Thank you very mutch for your answers.
Allan, I have one like this but I think it's a M18.
I go on e'bay to looking for one M12.

Regards

Claude

email (option): matrot.sandra@neuf.fr

Claude,

Yes, I have the M18 one, and it won't work with our bikes. For the M12 x 1 there are two more on eBay I saw just now - and I think they are the ones that will work. You may need to buy the drive cable as well, but they have those too.

I've written to the seller to ask the rotation, but had no reply as yet.

When I get an answer I'll let you know!

Best wishes,

Allan

email (option): allanmatchless@yahoo.com

Thank you very much Allan :relaxed:

Claude

email (option): matrot.sandra@neuf.fr

I have buy one for 18 Euros.
I tell you back if it's the good one.

Regards

Claude

email (option): matrot.sandra@neuf.fr

Bonjour Claude,

Regarde ici;

https://www.ebay.nl/itm/SMITHS-CHRONOMETRIC-SPEEDOMETER-BSA-M20-MILITARY/283248655005?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649

Regards,

Sven

email (option): snvosselman@gmail.com

Thank you Sven :wink:
But I receive the replica last week.
The diameter for the cable is the good one.
But my driver on the wheel don't work.

email (option): matrot.sandra@neuf.fr

Here in South Australia, Martyn Adams at MDA Motorcycle Engineering has a WD speedo for Au$999.

There is a Smiths chronometric speedo on ebay in the UK which is described as ex WD in working condition for around 165GBP.



https://www.ebay.com.au/itm/smiths-chronometric-bsa-norton-ex-wd-speedometer-bsa-trriumph-norton-sunbeam-ajs/312305138042?hash=item48b6d6397a:g:MpwAAOSwFYZb41Mj:rk:1:pf:0

email (option): tknalder@iinet.net.au

Hello Claude, I'm sorry to hear the reproduction speedo won't work for you. What is the rotation it needs? The reproduction one I have works just fine, and I even bought a second one just in case of disasters! I haven't been able to check the rotation of the drive cable, though, as my bike is on the workbench, strapped down by the front wheel, while I wait for some clutch parts to arrive. It's been four weeks...... Otherwise I could roll it off the bench, disconnect the cable, and check the rotation. I will do that as soon as I can finish the clutch work. I can tell you that the reproduction speedo I have that is not on the bike seems to need a counter-clockwise rotation as one looks at the back of the speedo itself. Which way does your drive cable rotate? I do apologize if my original information was not useful to you. As far as I know my gearbox drive is the standard wm20 item. Best wishes, Allan

email (option): allanmatchless@yahoo.com