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9

Their main problem is your first bullet hypothesis: They can't cope as well with sustained braking on descent, as that is where brakes are challenged the hardest. Even with the extra cooling fins, on a long descent, the brake may overheat, and may catastrophically fail. Riders using roller brakes have reported the brakes getting hot enough to ignite the ...


7

As has been pointed out, closed brakes are not ideal from the standpoint of disipating the energy built up through friction. This has also been experienced in the automotive world, where drum brakes were standard during many decades. Some would say they still are, e.g. on rear axels of light commercial vehicles such as pick-up trucks. However, although ...


2

Dutch town bikes are the norm in Japan (I live in Japan BTW). Most Japanese Dutch style bikes have a rim brake up front and a drum brake in the rear. Rim brake is for help going down hills and the like. As mountainous as Japan is the cities tend to be flat with hills. Most Japanese ride down hills no problem on a dutch bike. However, most Japanese walk their ...


2

Sheldon Brown has this to say about disadvantages of roller brakes: Disadvantages? [...] Only large Rollerbrakes with large cooling fins have enough heat dissipation for speed control on downgrades -- no Rollerbrake is suitable for use as a drag brake on a cargo bike or tandem. There have been reports of grease's catching on fire during long descents! ...



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