It is all leverage and you explained it well cheapskate.
Now that I understand how a coaster brake works I can see how brake pad material could play a part, as well as the hub internal material and overall diameter.
What I found interesting was there is suppose to be a thin layer of grease between the pads and hub, and the brake pads are grooved to move the grease out of the way.
That goes against everything I know about drum friction brakes from cars and trucks.
Can you imagine greasing your drums and grooving your brake pads on you car?
Originally Posted by Venice Motor Bikes
The gear ratio of the sprockets has nothing to do with the problems of modern coaster brakes... The problem is that they can over heat & lock up.
I can see why they would heat up and lock up if it's steel on steel with groves on the pads and you already had a low gear ratio, like a BMX bike for example.
On a coaster bike the stock gear is like 4th gear on a 5 speed, while a BMX is like 1st or 2nd gear.
Jezz, you turn your hubs if you get groves in them to keep flat surface to surface contact on a car.
What I need to explore is bike brake materials made of the material they use on auto brake shoes. The shoe material wears, not the hub, and it has good even pressure.
Sure you have replace the pads just like a car when they wear out, but that sure beats what seems to be the norm now.
Greasing the brake pads, man, that still just boggles my mind.