Speedometers and Cables

Speedometers became a legal requirement, in the UK, on 30th September 1937; machines manufactured prior to this still do not have to have one. In spite of this requirement, Ariels continued to list the speedometer as an extra for many years although the vast majority of machines had them fitted at the factory. The Smiths governor type of speedometer was fitted from 1933 until 1946 except for the W/NG models and those where a front wheel drive Smiths Chronometric was specified by the customer which was an option from 1938. The governor speedometer is usually called a ‘PA’ because this is what is on the face! The Chronometric type was standardised from 1947 onwards. The drive ratios are quite different for the two types which means altered drive gears in the gearbox, an additional set being added in 1950 when it was discovered that the first Chronometric set was incorrect, advice on this minefield will be given. When fitting a reconditioned speedometer it is advisable to also fit a new cable as an old one may damage the new unit. Test the cable by holding one end of the inner cable and attempting to twist the other end, more than ½ a turn indicates that it should be replaced. We do not supply or repair speedometers.

 

Cross section through speedo bezels

Part No.

Description

Model

Years

00610

Trip cable, 8 1/2” overall

65-9179

Bolt, speedometer bracket to top yoke, 2 per HT 1955-58

S19-2

Washer, speedometer bracket to top yoke, 2 per HT 1955-58

5200-38/80

Speedo face, 80 m.p.h. with trip odometer window 1938-48

5200-38/120

Speedo face, 120 m.p.h. with trip odometer window 1938-48

5200-49/80

Speedo face, 80 m.p.h. with trip odometer window 1949-58

5200-49/120

Speedo face, 120 m.p.h. with trip odometer window 1949-58

5204-38

Speedo bezel, plain, free standing speedometer All 1938-47

5204-47

Speedo bezel, sheet panel, lipped type, inc rubber and glass All 1947-58

5204-50

Speedo bezel, lipped Not used

5213-56

‘U’ clamp for Chronometric speedometer to panel All 1946-50

5213-56

‘U’ clamp for Chronometric speedometer to nacelle All 1956-58

5226-33

Cable – armoured – panel tank – PA speedometer All 1933-46

5226-38

Cable – front wheel to top yoke, centrally mounted speedometer 28 1/2” 1938-46

5226-41

Cable – front wheel drive 25” speedometer on side of forks Some W/NG 1941-46

5226-47

Cable-CP/BA gearbox to panel tank 35″ (not 1950 KH/SQ) All 1947-50

5226-50

Cable – CP/BA gearbox to top yoke 49″ (1950 KH/SQ only) All 1950-52

5226-52

Cable – GB gearbox to top yoke 45″ Rig/Plun not SQ 1952-55

5226-52A

Cable – GB gearbox to top yoke 47″ SQ 4 1952-58

5226-54

Cable – GB gearbox to top yoke 43″ S/arm 1954-58

5226-97

Conical rubber boot for end of speedometer cable at gearbox end. Included on new cables. It will have to be slit to fit it to an existing cable. All 1947-52

12767-54

Cable – rear wheel to top yoke 53″ HT 1955-58

5244-38

Speedometer drive gear on hub, 44T 1938-46

5244-39

Speedometer drive gear on hub, 43T 1939-46

5246-38

Speedo drive gear, small, front wheel drive speedometer 1938-46

287

Bulb, chronometric speedometer, 6V 2W 1938-58

ELE-50

Bulb holder with bulb for Chronometric speedometer 1938-58

PA-40

Bracket for Indian and Taiwanese clocks
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