Originally Posted by
big chainring
I think after the Consumer Safety regulations came into effect 1974? I think, most entry level bikes had the "safety levers' along with a whole slew of reflectors. Thats generally my cutoff date for bikes that I ride. Chaingaurds on the chainwheels, pie plates, turkey levers, reflectors, etc. YUCK!
CPSC announced in 1974, did not get solidified till 1975, implemented in 1976.
Comfort levers were NOT part of the CPSC regs.
But the ball end to them was.