there were further company changes and by december 1921 adverts for the quadrant motorcycle listed the company name as march, newark and co ltd, quadrant works, birmingham. in 1922 quadrant's london agent clifford wilson entered the international six days trial on his 654cc quadrant, he got a gold medal, and best in class. introduced in 1922 was a side valve 490cc single (bore 70mm, stroke 100mm), earlier models having a side exhaust, and rear inlet valve. in 1924 two models were offered, the 490 cc side-valve and a hefty 624 cc side-valve with bore and stroke of 85x110. the quadrant range included outdated side-valve motorcycles, updated in 1927 with the launch of a 490 cc overhead-valve model, but it did not sell well and the company was wound up in 1928.