Apr 02, 2006  This will consequently cause the speedometer and odometer to read too high or too low, not an ideal situation. 'Revs' in the table below referrs to the turns-per-mile (TPM) the speedo expects to receive from the transmission via the speedometer cable. The TPM of your speedo should be printed somewhere on the face, along with a serial number. Repairing Jaeger & Smiths Speedometers - Free download as PDF File (.pdf), Text File. And the speedometer serial number and the make/year of your car. Dragonfly Smiths Chronometric Speedo WARNING. Our lovely Smiths chronometric speedometer was sent away to London Instruments (London SE20 8RY) for a service/overhaul before being fitted back into.

SPEEDOMETERS UP TO 1964

Regarding Smiths speedometers a major change was made in 1964

Pre 1964 machines fitted the following.

The larger 3” instrument was of the Chronometric type. This in reality is a two in one clock a speed recorder and a distance recorder.

The speed is calculated by the same principle as used in clocks and watches which gives very accurate readings. The distance is calculated by a series of gears and ratios which move the numbers round.

Type identification numbers on the dial start

S xxx/x/x OR SCxxxx/xx for speedo RC xxxx/xx for Tacho

The 2” speedo was of the magnetic type still used today.

A magnet which is close to a metal disc is rotated by the drive cable and “drags” the disc round with it. A pointer is fixed to the disc which shows the speed on a dial.

A hair spring retains the disc from revolving freely. Speed is recorded by the drag of the magnet against the restraining force of the spring.

Mileage is again recorded by gears.

Type identification numbers on the dial

Aiml editor osx. X 80421 OR SN31xx/xx for Speedo RNxxxx/xx for Tacho

SPEEDOMETERS USED FROM 1964

In1963 the British motorcycle industry approached Smiths Industries to manufacture a cheaper 3” Speedo as the chronometric was too expensive for mass produced machines. Note British government (Police etc) still used Chronometric instruments after this time as they were very accurate and reliable.

The 3” speedometer manufactured after1963/4 used the same principle described earlier.

Type identification numbers on the dial start

SSM 3xxx/xx SSM 4xxx/xx SSM 5xxx/xx for speedo RSM 3xxx/xx RSM 4xxx/xx for Tacho.

The design of the smaller 2” Speedo was changed but the principle remained the same.

Type identification numbers on the dial start SSM 2xxx/xx Speedo RSM 2xxx/xx.

WE OFFER THE FOLLOWING SERVICES.

For Chronometric type we offer a repair only service by prior arrangement

With prices starting from £45.00.

Smiths Chronometric Speedometer Serial Numbers List

Early 2” pre 1964 type X80421 SN31xx/xx speedo RNxxxx/xx Tacho.

A repair only service starting from £30.00

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A full reconditioning with 12 months warranty +£120.00Late 3”starting SSM 3,4.5. RSM 3 or

Repair only service starts at £40.00

Smiths Chronometric Speedometer Rebuild

Full reconditioning with 12 months warranty £175.00

Later 2” starting 2xxx/xx Speedo or RSM 2

Repair only service start at £40.00

Full reconditioning with 12 months warranty £89.00

Smiths Chronometric Speedometer Serial Numbers Chart

Smiths Chronometric Speedometer Serial Numbers

Smiths Chronometric Speedometer Serial Numbers Free


Please use the SMITHS Catalogs below to find your specific cable.
  • SMITHS Flexible Drive Recognition Guide
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We have a comprehensive listing of cables for Motorcycles and Automobiles, 1949 to 1978.

Aberdale, A.B.J., A.C., Aermacchi, Allard, Alvis, AJS, Ambassador, Ariel, Armstrong, Aston Martin, Austin, Austin-Healey, B.A.C., Beardmore, Bentley, BLMC, Bond, Bown, Bristol, Brockhouse, Brough Superior, BSA, Chrysler, Citroen, Commer, Corgi, Cotton, CYC Auto, Daimler, Dayton, Delorean, DMW, DOT, Douglas, Ducati, Excelsior, Fairthorpe, F.L.M., Ford, Francis Barnett, Frisky, Greeves, Harley Davidson, Healey, Hillman, H.J.H., Humber, Indian, Isetta, Jaguar, James, Jensen, Lagonda, Lambretta, Laverda, Leyland, Lotus, M.G., Maserati, Matchless, Morgan, Morris, Moto Guzzi, Moto Parilla, New Hudson, Nimbus, Norman, Norton, O.E.C., Panther, Pashley, Phoenix, Princess, Raynal, Reliant, Riley, Rolls-Royce, Rover, Royal Enfield, Scootacar, Scott, Siddley, Singer, Standard, Swallow Gadabout, Sun, Sunbeam, Tandon, Tippen, Triumph, TVR, Velocette, Villiers, Vincent, Volvo, Wolseley