BSA M21 (AA) Wheel Rim Specifications

[GLENN]

Hi! 

Would anyone know what size, spec (WM2, or WM3) the correct wheel rims are for a 1960 BSA M21 AA model plunger?  The 1958 parts list mentions a different part number for the rear rim of the AA model and regular model (AA = 66-6054 and others = 66-6077. 

-The front is listed as 67-5543/3.  The parts list mentions a long spoke for the AA rigid, but no mention of the plunger.  This wheel has then 8" brake drum. 

Best Regards,

Glenn

[limeyrob]

Feked are showing 66-6054 as WM3.  I would expect the rear to be 7" drum, 8 " single sided on the front.

[GLENN]

I saw that too, tey listed this as a 19 inch WM3.  However they list this as OEM: 66-6077, 66-6054, 66-6054/3, and I thought there must be a difference when the parts manual listed these separately.  Theyn also list the front wheel rim 67-5543 as a WM2 19 inch.  I'm assuming the front and back would both be WM3 or WM2? 

Glenn

[limeyrob]

Not seen a WM3 on the front, pretty much always WM2 on the front.

[GLENN]

I believe the WM20 has WM3 rims front and rear.  So it would be quite normal for both rims to be different? 

Glenn

[limeyrob]

Is there one you can go and have a look at?  There was an AA outfit at Beaulieu.  I was crawling on the floor at the Sammy Miller museum trying get a picture of the rear tyre size on a Road Rocket!