Too right! BSA could build well engineered singles, just fell down a bit with their twins ! Well, except for their V twins !
But, anyway, good on MM. Interesting that BSA had to buy Ariel to add class ! Incidentally, BSA's first motorcycle product,a few years later than Triumph ( and Ariel) was a very much a copy of the Triumph single of the time !
Interesting, that is worth chasing up.Considering the first complete motorcycles BSA made were fitted with Minerva engine I would have expected their first complete engine to follow Minerva lines.
We also need to remember that BSA did not consider itself a motorcycle company till the late 60's by which time it was too late.
BSA was only making motorcycles to pay off the debts it incurred buying the land & building the factory to make rifles.
So spending a lot of money designing & developing motorcycles was very much not on the drawing board.
It just so happened that the same machines that made rifles could also make push bikes & motorcycles.
If it was more profitable to make sewing machine parts then we would not be here.
You need to keep this in mind when you look at things like wheels.
BSA made their own hubs & spokes but not the rims, why, because they had no rolling or roll forming machines and the same machines could not be used to make guns, so they got bought in .
It would appear that BSA made a lot of the parts used by other bicycle & motorcycle makers many of which were really assembly plants rather than manufacturing plants that took in raw metal and pumped out vehicles.
So it would be of little surprise to see lots of similarities between lots of period products.
Also remember that this is the age of slide rules so once a bore & stroke ratio is known to work reliably there is little incentive to change it.
Same for gear sets, tooth profiles etc etc etc.
The 2 speed box from my 1925 B2 ( should it ever get finished ) will drop right into any B or M rigid or punger frame with little more than a set of spacers.
Clutches can be interchanged between almost any BSA excludig the splined ( Burman ) clutch fitted to the plunger A series & Bantams.