The front wheel is off a 32-38 Blue Star And W/R and Empire Star 500. Silver Star has a provision for either type of Speedo.
The correct speedo gearbox is highly desirable and very hard to find.
Hi Shane
It’s a speedo drive gear
Normally these were found on earlier wheels fitted to k series models - 1939 season
The outer brake place is from later W models. 1940 onwards which is what makes the set up you have an oddity - the drive gear looks meaningless
It needs the earlier brake plate which has an aperture which has the speedo gearbox mounting fittings on it
Nice find & a scarce wheel to have
Ron - there are no drive dog notches on the hub left side. That explains why there is no speedo fitted to my bike. I guess that is going to make it difficult to getting a working speedo also??
Hi Shane,
I have a correct complete BSA WM20 front wheel here. I would like to swap it for your front wheel. Where are you located?