I guess not too many have seen the inside of the hub connected to the wheel well my cheap camera in hand I took a pic, and that is what I saw after splitting the case .
BSA A75 "Rocket Three"
As I build for the 70's Classic bikes (along with the Rocket of coarse) I have the various "bikes" that I build for in the workshop.
I have a T140 Bonneville.
T150 Trident.
T160 Trident.
A75 as above, I put the T160 with the T150 head on it in the A75 Chassis.
And a Norton Commando.
These are just empty Engines and chassis but perfect to build an accurate Exhaust System on.