VINTAGE BRITISH CABLES

The Best Quality reproduction SMITHS Speedo & Tacho Cables for your Vintage Ride
Custom Made Speedometer & Tachometer Cables for Motorcycles & Automobiles
Using NOS Fittings & Original SMITHS Presses and Dies
Medicine Hat, Alberta
Smiths Equipped
 
A.C.
Allard
Alvis
AJS
Ambassador
Ariel
Armstrong
Aston Martin
Austin
Austin-Healey
Bentley
BLMC
Bristol
Brockhouse
BSA
Chrysler
Cotton
Daimler
Dayton
DeLorean
DMW
DOT
Douglas
Ducati
Excelsior
Ford
Francis Barnett
Greeves
Harley Davidson
Hillman
H.J.H.
Humber
Indian
Jaguar
James
Jensen
Lambretta
Laverda
Leyland
Lotus
MG
Matchless
Morgan
Morris
Moto Guzzi
Moto Parilla
New Hudson
Nimbus
Norman
Norton
Panther
Phoenix
Princess
Riley
Rolls Royce
Rover
Royal Enfield
Siddley
Singer
Standard
Sun
Sunbeam
Triumph
Tandon
TVR
Velocett
Villiers
Vincent
Volvo
Wolseley
 
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   Home      Smiths Chronometric Repair

Back to: Motorcycle Instrument Repair

SMITHS Chronometric Speedometer, SMITHS Chronometric Tachometer Repair and Restoration for Motorcycles

SMITHS Chrono Speedometer and Chrono Tachometer repairs are covered by a one year warranty.
 
We have SMITHS Chronometric Instruments for sale at a cost of $600 without an exchange. Prices slightly higher for CCW or angle drive.
 
SMITHS Chrono Restoration Prices (CAN):
  • SMITHS Chronometric Instrument Restoration, $400 exchange plus postage.
  • 10% discount for a pair.
  • Return postage calculated on individual basis.
 Restorations are recommended for all but original condition bikes where maintaining the patina is desired.
 Restoration prices are for full restoration. NO extra costs for replacement parts.
 Restoration includes the movement overhauled and calibrated. All repairs and parts included in price.
 Refinished canister inside and out, new glass, bezel and seals.
 Mileage counter wheels refinished or replaced.
 New trip meter stem (all speedometers) and new bulb holder on chronometric instruments.
 Face and pointer are refinished or replaced. New case nuts and screws.
 Exchange Instruments must be salvageable (no dents in case, rust through etc.). Condition of glass, face or bezel does not matter.
 Exchange unit does not need to be a match for the instrument you require but must be chronometric for chronometric.
 Custom calibration available.
 

Smiths Chrono Repair quoted on an individual basis.

Repair costs are typically 75% of full restoration cost. (i.e. $300 chronometric).
Repairs typically consist of cleaning, repairing, lubricating and calibrating your instrument.
Case, pointer and face refinishing is NOT included.
Turn around is typically less than a week.
ALL instruments are repairable. Prices quoted accordingly.
 
We can match your motorcycle to the exact instrument it was meant to have. Your exchange instrument does not need to match.

Contact us with any inquiries. sales@vintagebritishcables.com
We accept credit cards through PayPal or by phone.
GST added to sales within Canada.
We Ship Worldwide.
 
RE 8 instruments: It is rare that I pay anyone to do something for me!  I am hard to please and am usually disappointed.  I’ve been telling myself all day waiting to pick up the box to just be happy with what I get from you and move on.  Well, I am elated with what you did!  They are beautifully restored! Thank you, and feel free to quote me! G.M.
 
The instruments arrived today.  They are PERFECT, absolutely beautiful!  Thanks so much.D.V.
 
The speedometer and cable arrived today. I installed both immediately and am elated to report that the kit works perfectly -- and the clock looks as new, too! C.R.

Items arrived safe and sound and all I can say is "Wow"!  B.R.

Superlative craftsmanship! Very pleased with the look and finish. Thank you very much for a job well done. W.E.
 
The package arrived safe and sound.  It looks beautiful!  Now I'm going to have to paint the bike. :} Thank you very much!!  M.T.

I received the package on Wednesday.  You’ve done a superb job on the restoration.  It is absolutely stunning.  G.H.

I received the gauges today. Best XXX bucks i've spent in a long time. They look great., thanks again.  D.G.

Received both instruments today...... they look excellent.  G.T.
 
I received this morning the tacho…Everything in this deal was absolutely perfect !!! And the tacho is incredibly beautiful !!!  P.F.
 
Beautiful : Thanks for the great job and wonderful service.  P.B.
 
The tachometer has arrived.    It is beautiful.  J.M.


 

SMITHS Chronometric Speedometer, General Description

The Chronometric Instrument, which is of the mechanical type and is driven by a flexible shaft, indicates the speed at which the vehicle is travelling,
by the number of revolutions the driven shaft makes during fixed time periods. Between these periods, the pointer of the instrument remains
Stationary and ensures accurate speed reading. The instrument is really two in one, a speed instrument and a distance recorder:
 
1. The speed indicator movement operates as follows: The camshaft gear (which is driven through a train of gears by the main spindle) drives the
camshaft the camshaft through a friction clutch. Attached to the camshaft is the wheel of the lever escapement (similar in principle to that usually
employed in clocks and watches) which ensures that at all speeds at which the the instrument is designed to operate the rotational speed of the
camshaft is constant, being controlled by the escapement that provides the time basis on which the mechanism operates in period cycles of 0.8 seconds.
 
The mechanism is in motion at a speed within its operational range. The uppermost cam on the camshaft actuates a rocking arm which causes 
periodic engagement of the commander pinion with the integrator wheel. Since the time of the engagement is constant at all speeds, but the rotational
speed of the commander pinion is proportional to that of the driving flex, the integrator wheel will be rotated by an amount depending on the driving
flex speed. The movement of the integrator wheel is communicated, by driving pegs or pins, to the corrector wheel, thence to the stabilisator to
which is fitted a hollow shaft that carries the pointer. Return springs are fitted to the integrator and the corrector wheels, the teeth of which are 
engaged by spring fingers which are lifted in turn by the camshaft. The stabilisator is free on its shaft and is coupled with the integrator in such a 
manner as to give a pointer reading which is the average of several cycles of the mechanism.
 
The complete sequence is therefore:
 
  a) Rocking spindle is engaged with integrator wheel, which is rotated according to the speed to be measured, carrying with it the integrator,
      stabilisator and pointer drive.
 
  b) Rocking spindle disengages.
 
  c) Integrator wheel returns to zero position, leaving integrator, stabilisator and pointer in position.
 
  d) Rocking spindle re-engages integrator wheel and the spring finger of the recorder is momentarily lifted to allow the recorder to take up
      new position.
 
It will be seen that the recorder wheel, stabilisator and pointer remain fixed between the intervals of engagement of the rocking spindle, with the
result that the pointer takes up a position, at the end of each interval, corresponding to the number of revolutions the driven shaft has made during
that period.
 
2. The Distance recorder Mechanism consists of two ratchet wheels and two sets of counters, trip and total, mounted on a shaft and fitted into the zinc
base allow frame.
 
On careful examination it will be seen that one face of each counter has been formed with ratchet teeth and the other has a well defined cam profile. All
counters are identical with the exception of the trip decimal counter which is red.
 
The counter drum ratchet teeth are locked in comb springs. At every complete turn of a counter drum, a section of the comb spring is depressed by 
the counter drum cam, allowing the next counter to turn one unit before being again locked.
 
The distance recording counters are turned by a pawl operated ratchet, mounted on an eccentric fitted to the worm wheel spindle, the worm wheel being
driven by the main shaft.
 
It must be emphasised that maintenance and repairs must be carried out by qualified persons using genuine Smiths parts.