BSA 1920 557 cc model “K” chain- cum- belt single frame # 38212engine # H6866
BSA entered the motor cycle market with a sturdy 3 ½ HP belt driven single-geared machine, that was displayed at the 1910 Olympia show. It was constructed almost entirely from BSA- made components and was produced from the company’s Redditch factory.
Within six months from their launching, BSA’s were selling well. The machines were easily distinguishable among rival makes by their yellow and green painted tanks.
For 1915 there was a choice between the 85×88 3 ½ HP model and the 85×98 4 ¼ HP model.
This latter machine was offered as being especially suitable for sidecar work. It also had the 3-speed BSA gearbox with foot controlled clutch that was introduced in 1914 and a double barrel BSA carburettor.
Both models could be had in chain-cum-belt version or in all chain drive with encased chains, which made the machine 3 pounds and 5 shillings more expensive.
After the war the 3 ½ HP model was only available as single speed TT model.
The range had been expanded by a 770 cc V-twin.
Main sellers were still the sturdy and reliable 557 cc side valve machines.