Originally Posted by
CroMo Mike
Hydraulic and/or mechanical disc brakes were being used on cars, trucks, busses, subway trains, airplanes, motorcycles, go karts, lawn mowers, etc. years before they became common on bicycles. So why did it take so long?
Reluctance to change and obsession with weight (still both lingering). Maybe cost too at the lower end of the market. Mountain bikes really paved the way for bicycle disc brakes and it was inevitable that they would eventually find their way onto all other types of bike.