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The current forum photo of the BSA AA combinations offers some interesting snippets. The recent discussion regarding rear lifting stay handles appears to show the short version (i.e distance between rear mudguard and underside of the lifting handle.
Also visible on the third sidecar is the much sought after side light / tail light + the mounting position of the tax disc holder is off the sidecar body rather than on the motorcycle itself.
I assume FLT 159 is a de-luxe model as it has the valanced front mudguard.
So to a couple of questions that perhaps folks can help with.
1. Does anyone know who made the sidecar bodies? I assume they were not made by BSA.
2. Is it believed that these same sidecar bodies were those that were used on some SWD Big 4s albeit without the rack on top of the box or the Pyrene Fire Extinguisher.
Has anyone ever seen one of these sidecar bodies? The ones I saw in the late 1960s were a different design. I think they were fibreglass or at least part fibreglass as I seem to recall the sidecar mudguard was integral with the sidecar body. These pre-war bodies I assume were timber body with a sheet metal covering.
One of my SWD Big 4s was equipped with an AA type sidecar body and the long term project is to make a replica of that so any help would be appreciated.
Thanks.
Hi Keith
Possibly Swallow or SS Cars, there is a bit in "Jaguar the history of a great British car" by Andrew Whyte which gives the claimed company war time production figues which includes
335 Special RAF camera carrying sidecars
3,751 WD Sidecars
1,295 Box Sidecars
3,927 Passenger Sidecars
With the passenger sidecars BSA M20s appeared to have the Swallow model 8 fitted on a Swallow chassis, Norton 16Hs had a Norton chassis but did they use the Norton passenger body or the Swallow? 3,927 seems to be too many just for the BSAs?
And I have always been intrigued by an RAF camera carrying sidecar?
Rob
email (option): robmiller11(a)yahoo.co.uk
Netley Marsh last year. Not exactly the same body...Could this be a replica...?

email (option): wd.register@gmail.com
I took some pictures of an AA sidecar in Moretonhamptead motor Museum a few years ago, the bike I seem to remember was ex WD but the sidecar looked original and I think was steel over a wood frame.
And I'm sure Rik turned up a document that mentioned the WD version being 9 inchs longer than the standard AA box?
Rob

email (option): robmiller11(a)yahoo.co.uk
Keith you mentioned the sidelight on the 3rd bike. That one is a normal white/clear lens Lucas 1130 which you can probably buy every day on ebay. The rare one is the rear lamp "MT"1130 with red lens and number plate illumination.
I've often wondered why they were prefixed MT? Which to my mind indicates military. But they were used more on civilian BSA and Ariel and never on military Ariel's??
Ron
email (option): ronpier@talk21.com
Is it possible to accurately date the two in the wartime picture from the registration numbers, it would be nice to know if these are JM20s or KM20s?
Rob
email (option): robmiller11(a)yahoo.co.uk
Good morning everyone,
I have a completely original and unrestored 56’ M21 AA Outfit the sidecar box is the same as Jan photographed at Netley Marsh, As far as I know there were 3 body types early ones with fully opening lid, Late 40s early 50s which is my type and later fibreglass ones used on the plunger framed bikes, I’m sure but not 100% certain the boxes were coach built by BSA with a ash frame and welded up galvanised body the fibreglass ones were made by Michenhalls (Don’t know if i’ve spelt that right ?) Measurements are Length tip to tail 52” 1/4, Width 18” 1/4 Depth 15” The lid is missing from mine
but I do know they were 2” deep, Haven’t a clue how to post pictures but I can mail some to anyone who may want some’
Regards Tom,
email (option): rustytomm20@hotmail.com
Hi Keith,
Yes no problem, mail me and i’ll send some pictures,
Regards Tom.
email (option): rustytomm20@hotmail.com
It seems that initially, Norton supplied some standard Tradesman's box sidecars on 16Hs...For the Admiralty at least. 'SHX' was issued from mid-1939, but the outfit with steel pannier toolboxes must date from mid to late 1940.
They also appear to have supplied the RN with 'AA' type box bodies, although it's not possible to see if this one is extended.
There is also an odd box featured amongst the Kidbrook Collection but quite what it's doing there is a puzzle. Maybe it was their post-war runabout. It's a late-war 16H with 18" wheels and 'JXX' is a 1949 registration series. I think it's a red herring.
The contract details for the 1940 SWD Big 4 contract C6831 indicate that the bodies were 9" longer than a standard AA Box. I believe that this was the first box body contract although there is a reference in one BEF CMP war diary dated 21st April 1940 to the effect that the War Establishment of a Provost Company had been amended to include 13 box sidecar outfits to carry signage and lamps for traffic control. I suspect that these didn't reach France and were introduced later in 1940.

email (option): ronpier@talk21.com
Any chance that someone with greater computer skills than myself ( that is everyone by the way)could append the forum photograph to this thread. Many thanks.
Ron, just a thought, but the 110 was an 'MT' before the 1130 came along. Is 'Motorcycle Tail' too obvious an answer ?
Bloody Hell, of course Rik. MT210-MT211-MT110 All "Motorcycle Tail lamps" :flushed: Ron
email (option): ronpier@talk21.com
My wallet was 'M T' after purchasing one of those lamps.😂
email (option): Fuzzyempire@hotmail.com
Hamish:smiley: What bike have you fitted it to? Ron
email (option): ronpier@talk21.com
Hi Ron. I have a fairly rough early post war Ariel Red Hunter. Its work in progress but I was lucky enough to find the correct number plate bracket with most of a MT1130a lamp still in place.
email (option): Fuzzyempire@hotmail.com
Post war Red Hunter? I always thought they were only used on BSA and Ariel for the 39-40 period. I'll have to look into it.
Cheers Ron
email (option): ronpier@talk21.com
As far as I've found out, They were only fitted to Ariel's in 1939......You might as well give it to me Hamish. Ron
email (option): ronpier@talk21.com
You're right, Ron. It would devalue a post-war bike, being incorrect and all that, just by being there ! :slightly_smiling_face:
All yours Ron. Come and pick it up. I live in New Zealand.🙂 I'm basing my use of MT1130a on two pictures in Roy Bacons "Ariel,The postwar models" book.
email (option): Fuzzyempire@hotmail.com
I know a bloke in NZ......I'll send him round:upside_down_face: :upside_down_face:
God know's about those lamps? An awful lot of effort to make a strange lamp and its special number plate for one year only, for just two makes.
A friend of mine (Dino) has collected all original motorcycle related Lucas catalogues tells me that the MT1130 doesn't exist, because they're not listed in any catalogue. I had trouble getting him to accept it! I guess they must have been a special order by BSA and Ariel? Ron
email (option): ronpier@talk21.com
I used one on my T120R 'TT' Special...I just like the shape of them....I often use parts I like, as opposed to what should be there, if I think it suits the style of the bike better...
Interesting thread about the AA outfits (as well as rear lights)..A friend of mine had an 1939 AA Triumph Speed Twin ..Ian
email (option): ian@wright52.plus.com
I've see a pre-war Triumph 6S engine stamped AA (600cc SV sidecar tug) which would have been fitted in the same frame as the Speedtwin and Tiger 100. It was sold to John A (W&P) by mistake for his 5SW frame.....Of course it was too big. Ron
email (option): ronpier@talk21.com
The Big4s with box bodies were issued to the Airborne Divisional Provost Company which landed at Arnhem, I don't know if they went, its possible that they had already been replaced with Jeeps by September 1944 or perhaps they just weren't a priority in glider allocation?
Thanks to Rob van Meel for this info.
Rob

email (option): robmiller11(a)yahoo.co.uk
Maybe they were 16H Rob? Ron
email (option): ronpier@talk21.com
All the evidence suggests that the early to mid war establishment for a provost company included SWD Big 4s for carrying signage and lamps.
I've seen no evidence that the War Office (army) took any 16H sidecars at all, whether passenger or box bodied. It is clear that the Admiralty had some box bodies and I daresay the Air Force got hold of some too.
I think I saw a photograph on here sometime ago of a SWD Big 4 combination inside a glider (a Horsa I presume).
Sorry, what means AA ?? Thanks in advance! Regards
email (option): m606paz@yahoo.com.ar
Automobile Association....Ian
email (option): ian@wright52.plus.com
email (option): m606paz@yahoo.com.ar
I thought I would nudge this thread to the top for Ron
Rob
email (option): robmiller11(a)yahoo.co.uk
Thanks Rob. Sometimes it's interesting going back over previous stuff. I'll forward this to Raymond in Ireland who has a Box Body contract Big 4. Ron
email (option): ronpier@talk21.com