1930’s optional speedo’s

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Kevin.Priest
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1930’s optional speedo’s

Postby Kevin.Priest » Wed Feb 28, 2018 7:03 pm

I have 2 bikes that I am uncertain about Speedo’s .
Does anyone know what type would have been fitted if ordered when new to a

1931 VF & 1933 VF

Both bikes currently have what looks like a PA but the face says different .

Ian.Taylor
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Re: 1930’s optional speedo’s

Postby Ian.Taylor » Wed Feb 28, 2018 7:24 pm

My 31 VF takes a MA or PN type speedometer. I bought a 80mph one 3 years ago and it happens to read in K not MPH..lol

Kevin.Priest
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Re: 1930’s optional speedo’s

Postby Kevin.Priest » Wed Feb 28, 2018 8:22 pm

Hi Ian , my VF31 has a 60mph PN , maybe that’s correct then .

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Re: 1930’s optional speedo’s

Postby hristo.kiskinov » Thu Mar 01, 2018 11:57 am

Please see the attached file.
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Smiths-Ariel.JPG

paul_turner
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Re: 1930’s optional speedo’s

Postby paul_turner » Thu Mar 01, 2018 12:40 pm

thank you Hristo for posting this, really useful information. Just wondering if perhaps John our admin could move it to the depository for future views ?

Kevin.Priest
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Re: 1930’s optional speedo’s

Postby Kevin.Priest » Thu Mar 01, 2018 12:42 pm

Thanks for that Info my VF is wrong based on this ! Looks like it should be a 100mph PN.

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Re: 1930’s optional speedo’s

Postby Ian.Taylor » Thu Mar 01, 2018 4:31 pm

Mine isn't correct for sure and I knew that when I installed it but it works . They are very rare here in Canada these old speedo's are. I have yet to see a 100mph type for sale. Lot's of the 60 mph N/PN types the 80 mph seem a bit more rare .
My 80 mph or should say 80 k..lol speedo came from a 1930's car.
I usually ride at 43-47 mph and once did 55 mph .
No need for a 100mph speedo for me..lol
I also have a cats eye bicycle speedo on the girder fork which is much easier to read than glancing down at the tank to read the speedo.
My cats eye in MPH is dead accurate as my speedo in K which surprised me.

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paul.jameson
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Re: 1930’s optional speedo’s

Postby paul.jameson » Fri Mar 02, 2018 9:25 pm

Kevin,

Do be warned that the 135 degree drive speedos come in a wide variety of gearing options. You can often pick one up cheaply enough at autojumbles but most are for cars and have a flex speed of over 3000rpm, flex speed being the number of rotations of the speedo cable per mile travelled. Bikes tend to have lower flex speeds and I think the one for your bikes will be 2080. its logical enough, given that most cars in the 1930s probably travelled at about 40mph max whereas the hooligans on bikes were doing 60mph, meaning that the rotation of the speedo mechanism was about the same. You can only be sure of the gearing by dismantling the speedo and counting the teeth on the odometer drive gears - which is not possible at the autojumble! Speedos geared for bikes are quite rare but converting the car ones to read the correct speed is not too difficult. Getting them to read the correct mileage means finding the correct gears, which means finding a bike speedo.......

The bicycle speedo on the handlebars is definitely the easiest, cheapest and most accurate solution.
Paul Jameson
36 4G, 37 VH, 54 KH(A), 75 Healey 1000/4, 52/53 ex ISDT KHA (project).
Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser (over a 25 year period).
Now Archivist once more - but not Machine Registrar.

Kevin.Priest
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Re: 1930’s optional speedo’s

Postby Kevin.Priest » Sat Mar 03, 2018 7:50 am

Hi Paul , thanks for that . I am gonna search for a speedo for the 31 VF and with your info I’ll be careful with what I pay. Guess it’s gonna take some time .
Today I am going to go check out the 33 VF shortly as I know it has a different speedo and it Definately has a different gearbox I have a feeling it has a N speedo fitted which is likely to be wrong too .
Cycle speedo definitely .

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Re: 1930’s optional speedo’s

Postby hristo.kiskinov » Sat Mar 03, 2018 9:31 am

I think, this is correct for a 1931 Ariel (without tank panel):
https://www.marktplaats.nl/a/motoren/on ... ousPage=lr


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