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1966 Lightning speedometer drive ratio #6679
12/20/05 4:17 pm
12/20/05 4:17 pm
Joined: Dec 2005
Posts: 9
Alabama gulf coast
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leaders100 Offline OP
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Alabama gulf coast
I need to know the speedometer drive ratio for a 1966 Lightning.

Thanks.

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Re: 1966 Lightning speedometer drive ratio #6680
12/21/05 12:03 am
12/21/05 12:03 am
Joined: Jan 2003
Posts: 522
San Diego, CA
Will S. Offline
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Will S.  Offline
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Joined: Jan 2003
Posts: 522
San Diego, CA
I don't know the ratio, but I can tell you that the speedo drive unit on my '66 Lightning is a BG5330/31.
Hope that helps!


Will S.
BSAs: '66 & '69 Lightning
Triumphs: '68 TR6R, '68 Bonneville, '73 TR7, '55 6T
'71 Norton Commando

www.britironsd.com
Re: 1966 Lightning speedometer drive ratio #6681
12/21/05 3:14 pm
12/21/05 3:14 pm
Joined: Dec 2005
Posts: 9
Alabama gulf coast
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leaders100 Offline OP
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leaders100  Offline OP
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Joined: Dec 2005
Posts: 9
Alabama gulf coast
Will,

Thanks for the information. I have been trying to find out by seraching the Internet but haven't found anything so far. I will try again with the part number.

----

1953 Whizzer Pacemaker
1965 Triumph T100
1966 BSA A65L
1967 Triumph T120
1969 BSA B44VS
1984 Honda VF500C

Re: 1966 Lightning speedometer drive ratio #6682
12/21/05 4:36 pm
12/21/05 4:36 pm
Joined: Sep 2002
Posts: 7,812
Seattle
Alex Offline

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Alex  Offline

BritBike Forum member
Joined: Sep 2002
Posts: 7,812
Seattle
1.25:1 (15:12) for mph, 2:1 for kph.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Re: 1966 Lightning speedometer drive ratio #6683
12/21/05 5:26 pm
12/21/05 5:26 pm
Joined: Dec 2005
Posts: 9
Alabama gulf coast
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leaders100 Offline OP
BritBike Forum
leaders100  Offline OP
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Joined: Dec 2005
Posts: 9
Alabama gulf coast
Alex,

Thanks for your response. What I am trying to figure out is if a SSM5001/05 (MPH) will work properly with my original 1966 speedo drive. The 1966 Lightning used a SSM 5001/03A, the 1967-69 used the SSM5001/05 with a 1.25:1 ratio. Are you certain the 1966 ratio is the same as the 1967-69?

Re: 1966 Lightning speedometer drive ratio #6684
12/21/05 6:54 pm
12/21/05 6:54 pm
Joined: Sep 2002
Posts: 7,812
Seattle
Alex Offline

BritBike Forum member
Alex  Offline

BritBike Forum member
Joined: Sep 2002
Posts: 7,812
Seattle
The parts manuals say that they are the same ratio. I've been interchanging them for a while throughout the model years. Even between twins and singles, triumphs and BSA's and the only differences I've seen is the diameter of the hole in the hub.

That said, I'm not sure it matters too much. Smiths magnetic gauges were notoriously inaccurate when new (up to 15%) and probably don't improve with age.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Re: 1966 Lightning speedometer drive ratio #6685
12/21/05 7:04 pm
12/21/05 7:04 pm
Joined: Dec 2005
Posts: 9
Alabama gulf coast
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leaders100 Offline OP
BritBike Forum
leaders100  Offline OP
BritBike Forum
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Joined: Dec 2005
Posts: 9
Alabama gulf coast
Alex,

Thank you very much for the information. You covered exactly what I needed to know. I also need to know the part number of the 1966 stock upper triple tree or other equivalent parts numbers that will fit and accept the stock mounting plate for the speedo and tach.

----

1953 Whizzer Pacemaker
1965 Triumph T100
1966 BSA A65L
1967 Triumph T120
1969 BSA B44VS
1984 Honda VF500C

Re: 1966 Lightning speedometer drive ratio #6686
12/21/05 7:41 pm
12/21/05 7:41 pm
Joined: Sep 2002
Posts: 7,812
Seattle
Alex Offline

BritBike Forum member
Alex  Offline

BritBike Forum member
Joined: Sep 2002
Posts: 7,812
Seattle
68-5129


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Re: 1966 Lightning speedometer drive ratio #6687
12/21/05 8:01 pm
12/21/05 8:01 pm
Joined: Dec 2005
Posts: 9
Alabama gulf coast
L
leaders100 Offline OP
BritBike Forum
leaders100  Offline OP
BritBike Forum
L
Joined: Dec 2005
Posts: 9
Alabama gulf coast
Alex,

Thank you for all the very helpful information.


----

1953 Whizzer Pacemaker
1965 Triumph T100
1966 BSA A65L
1967 Triumph T120
1969 BSA B44VS
1984 Honda VF500C


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