Common commuter bikes in 1920/30s were roadster (bolt up rear stays) 24 inch frame 12 inch bottom bracket. rod brakes 28 x 1 1/2 wheels 7 inch cranks and around 67 degree angles. , many with hub gear. generally black to make them look strong (illusion).
These usually had the saddle at its lowest and were still too large..
By the late 30s the need to stop with a foot on the ground in traffic resulted in an overdue revision. So 26 inch wheels bracket height 10.5 inches fully brazed frames , 70 or71 degree angles. and frame 21 or 23 inch.
Keith
These usually had the saddle at its lowest and were still too large..
By the late 30s the need to stop with a foot on the ground in traffic resulted in an overdue revision. So 26 inch wheels bracket height 10.5 inches fully brazed frames , 70 or71 degree angles. and frame 21 or 23 inch.
Keith