Hi There,
i'm struggling to I.D my frame. i am unsure of its age or even if its an m20/21 frame.

the frame number starts with ZM21 (this is also on the registration certificate) and i can't find any reference to it for any BSA.

the number is in the right spot and relatively clear to read, (the only letter that i struggle with is the 'M' in 'ZM'.

to my eyes, it is straight and shows no signs of being altered, ( unless it has been ground off and completely replaced)

my engine number is a WM20 number.

any idea's??

Thanks

email (option): richedellis@yahoo.co.uk

Hi Richard,
ZM prefix is for bikes built from '49 to '52.
Both the M20 and the M21 shared the M20 frame and that is why you wont find a reference to an M21 frame so I would say your frame number has been altered maybe to make an erroneous matching numbers bike.

If you post a photo of the frame number the experts here will be able to tell you if the letter font is correct.

email (option): spacemonkeym@gmail.com

see my reply under your previous post (enquiry) on the same subject...'M20/M21 identification...Ian

email (option): ian@wright52.plus.com

the frame number starts with ZM21[/quote]

No matter if it's an M20 or an M21 it would always have M20 as frame number and in your case ZM20. This can only be a frame number that has been changed.

Henk

email (option): ahum@quicknet.nl