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1958 B33 Speedometer. #639224
02/08/16 7:51 pm
02/08/16 7:51 pm
Joined: Feb 2008
Posts: 4,359
New Jersey USA
Tridentman Offline OP

BritBike Forum member
Tridentman  Offline OP

BritBike Forum member
Joined: Feb 2008
Posts: 4,359
New Jersey USA
The speedometer fitted to the B33 I am working on does not work so I am going to get it refurbished.
Before I do this I just want to confirm that it is the correct speedometer.
The markings on the face are "SC 1302/04 1000"
It is driven off the gearbox.
Can anyone with a Smiths Chronometric listing please confirm or otherwise that this is the correct head?
Many thanks in advance for info.

Last edited by Tridentman; 02/08/16 8:03 pm.
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Re: 1958 B33 Speedometer. [Re: Tridentman] #639279
02/09/16 2:51 am
02/09/16 2:51 am
Joined: Sep 2001
Posts: 2,796
Comox BC Canada
G
Gordo in Comox Offline
BritBike Forum member
Gordo in Comox  Offline
BritBike Forum member
G
Joined: Sep 2001
Posts: 2,796
Comox BC Canada
The 54-58 chart I have does not agree with your numbers. It shows the 58 B33 with 3305/04 for solo and sidecar. The 58 B33 Special uses 3305/08. Ratios are not shown but I would be surprised if 1000 was the correct ratio for a STD gearbox and normal sprockets.

Gordo


Without frequent roadside repairs there is no fun in riding!
Re: 1958 B33 Speedometer. [Re: Tridentman] #639330
02/09/16 11:36 am
02/09/16 11:36 am
Joined: Feb 2008
Posts: 4,359
New Jersey USA
Tridentman Offline OP

BritBike Forum member
Tridentman  Offline OP

BritBike Forum member
Joined: Feb 2008
Posts: 4,359
New Jersey USA
Gordo--many thanks for the info.
I rather suspected that the speedo was not correct---I bought the bike as a non running bitsa so this sort of thing is not unexpected.
I guess the fact that the same speedo is specced for solo and sidecar use is that the difference between the two is the number of teeth on the engine sprocket---so the speedo is not affected.
Any idea what my unit was originally used on?
All info gratefully received.

Re: 1958 B33 Speedometer. [Re: Tridentman] #639386
02/09/16 3:58 pm
02/09/16 3:58 pm
Joined: Sep 2001
Posts: 2,796
Comox BC Canada
G
Gordo in Comox Offline
BritBike Forum member
Gordo in Comox  Offline
BritBike Forum member
G
Joined: Sep 2001
Posts: 2,796
Comox BC Canada
Tridentman: I have limited charts and I am on not sure how unique the codes are between brands of bikes. In the Matchless section of one of my charts there are some 1302 speedos ie G80 1959- 1302/01, G12CS (yr?)1302/01. That is as close as I can get.

As for ratio on the face for a STD box, 19T gearbox sprocket and 42 rear sprocket I would expect to see something around 1450 depending on the exact tyre you have. An 80 inches rolling circumference tyre would be need 1459 and the smaller tyres would need a larger number.

Gordo


Without frequent roadside repairs there is no fun in riding!

Moderated by  Allan Gill, Jon W. Whitley 


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