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#856383 08/18/21 2:26 am
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pigpen Offline OP
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I recently purchased a 1954 B31 frame numbered CB31 15xx. It has several details that lead me to think it may be, or may have been a comp bile. Details include a 21 inch front wheel and chrome chain guard.
Certainly the engine numbers would dictate specifics, but the hole between the frame tubes tells us that there is no engine!
Hopefully I can post a pic or two...
Tom

20210816_174427.jpg
BSA Goldstar on eBay
pigpen #856384 08/18/21 2:28 am
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Oopps...not the pic I wanted to post! Oh well, you get the idea. Those are B44 fenders!

pigpen #856408 08/18/21 3:03 pm
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I would guess you know most "comp bikes" came with a CB32 prefix frame. Only significant difference from what you have would be provision for rear-set pegs on a road frame and maybe lack of passenger peg mounting loops on one or both sides and a plate to accommodate a central mount oil tank on a dirt bike frame. Your frame does not have the cross over set up for the later cable actuated rear brake which is good and it should work fine for your purposes but I doubt it was originally an off road frame.


Laurence Luce
pigpen #856412 08/18/21 3:41 pm
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I believe there were a few, less than 100, B31 framed "competition" machines built with BB34A engines for the '54 model year. Not Gold Stars but an alloy engined road bike advertised as a competition model.

This is a picture of one that was offered to me that was up in Idaho a few years ago. B31 frame with BB34A engine, low pipe, magdyno, side oil tank.


[Linked Image from i.postimg.cc]



Bill B...


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pigpen #856419 08/18/21 4:58 pm
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I'm finding an amazing amount of information in print and online...much of which is somewhat contradictory. For example, this example has an 8 inch front brake, my reading suggests it 'should' be 7 inches.
I don't know if any of it matters...it will be a mongrel bitsa...llke my other bikes!
Thanks for the insight!

pigpen #856461 08/18/21 11:32 pm
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I don’t understand your reasoning that suggests a chrome chainguard hints at competition ? Aluminium maybe for some weight loss but not chrome surely?

pigpen #856464 08/18/21 11:42 pm
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Black chain guard would be more sensible for competition, less likely to fracture than a chromed one.

pigpen #856532 08/19/21 3:37 pm
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As per Roy Bacon, all competition models, including Gold Stars, had a chrome chain guard.

pigpen #856535 08/19/21 4:41 pm
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None of the true competition models ive seen have the side stand bracket . But you never know .

pigpen #856588 08/20/21 3:08 am
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Originally Posted by pigpen
As per Roy Bacon, all competition models, including Gold Stars, had a chrome chain guard.

Bacons books were nothing more than the UK factory promotional material sent to his employer, rehashed into a book.
As such it ( and every other one of the 750 publications attributed to him ) are UK specific.
So it is very dangerous to use Bacon as a refference for USA bikes .
There was a Gold Star owner who did proper research into Gold Stars worldwide & published an excellent book
Even better when he was made aware of mistakes or omissions they were included in latter editions .
It is called The Gold Star Buyer's Companion


Bike Beesa
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pigpen #857939 09/08/21 7:57 pm
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The bikes that BSA made specifically for the US market and options and finishes for them, East and West Coast are hardly touched-on in the various books about BSA.

This is a shameful omission by (mostly UK) authors, given that the US market kept BSA afloat from the mid- 50s onwards and influenced the models developed and introduced into the catalogue.

Roy Bacon's books are well presented, easy to read and attractive and a great promoter of the cause for people wanting to know more about vintage bikes before dipping a toe, or diving in.

They are a very useful restorer's guide but not always accurate on some details and as long as you know that and look elsewhere for those (In Britbike, for example), you'll be fine.

Last edited by Myles Raymond; 09/09/21 1:58 pm.

Myles Raymond, Glasgow, Scotland.

1934 BSA R35-4 DeLuxe, 1949 ZB32 Clubman Gold Star, 1955 BSA A7ss, 1961 DBD34 Clubman Gold Star and others.
"A tidy workshop is a shop where no work is ever done" - my Dad.
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pigpen #858369 09/13/21 4:21 pm
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Thanks, Myles. You are, of course, correct.
I'm finding a variety of interesting details that could sway my opinion. (Read that to say I think I know how I'll build it, but have little idea of how it started!) I'm having fun searching for parts and determining what would be fitting/suitable/acceptable. This will, excuse the expression, be a mongrel.
Tom

pigpen #858414 09/14/21 1:15 am
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So pigpen, did your bike come out of Northern Idaho?


Bill B...


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pigpen #858537 09/15/21 2:18 pm
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Nope, just north of Seattle.


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