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A10 frame oddity #734532
05/08/18 8:48 pm
05/08/18 8:48 pm
Joined: Nov 2009
Posts: 612
B
bon Offline OP
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bon  Offline OP
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Joined: Nov 2009
Posts: 612
On the swingarm frame of my A10 which i am rebuilding, there is a large tapered hole. This is about an inch in diameter at its widest. It is where the toolbox top mounting bolt passes through the frame on the shock top mount area.

I can see no real reason for this feature and having looked online, don't see it on any other frames. I do not really care about it, but it is making fitting the lifting handle difficult to fit.

What was it for ? my best stab in the dark is sidecar mounting.

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Re: A10 frame oddity [Re: bon] #734567
05/09/18 1:25 am
05/09/18 1:25 am
Joined: Feb 2003
Posts: 2,925
Ohio
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Rickman Offline
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Joined: Feb 2003
Posts: 2,925
Ohio
..... I'd like to see a pic of this!

Re: A10 frame oddity [Re: bon] #734568
05/09/18 2:49 am
05/09/18 2:49 am
Joined: Feb 2008
Posts: 4,304
New Jersey USA
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Tridentman  Online Content

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Joined: Feb 2008
Posts: 4,304
New Jersey USA
What year is the frame?

Re: A10 frame oddity [Re: bon] #734634
05/09/18 3:56 pm
05/09/18 3:56 pm
Joined: Nov 2009
Posts: 612
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bon Offline OP
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bon  Offline OP
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Joined: Nov 2009
Posts: 612
Its a 1957-58 frame. I will try to post photos later on.

Re: A10 frame oddity [Re: bon] #734642
05/09/18 4:57 pm
05/09/18 4:57 pm
Joined: Feb 2008
Posts: 4,304
New Jersey USA
Tridentman Online content

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Tridentman  Online Content

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Joined: Feb 2008
Posts: 4,304
New Jersey USA
The A7/A10 swinging arm frames were introduced in 1954..
For the first few years BSA recommended use of the plunger frame (which was still in production ) for sidecar use.
When the production of the plunger frames ceased (I am not sure of the year but maybe 1957/58) BSA then recommended use of the swinging arm frame for sidecar use.
When they did that I think that they added a sidecar fitting lug to the frame just under the nose of the seat and one within the pillion footrest frame loop.
So your frame may have been one of the swinging arm frames without the sidecar lugs fitted at the factory and someone has made his own attempt to get a sidecar fitting near the top of the suspension unit.
OR--of course--it may not have been anything to do with that at all!
HTH


Moderated by  Allan Gill, Jon W. Whitley 


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