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If you're friction shifting go with the Dia Compe. They have a ratcheting mechanism in them originally developed by SunTour to counteract the spring in the derailleur. This gives them a very even feel in both directions - you apply as much pressure to upshift as to downshift. They also look better on older bikes. The Shimano shifters OTOH rely purely on ...


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Check out the IRD Defiant wide range double crankset http://store.somafab.com/irdwicorodoc.html) It has a 94bcd which allows it to run 46x30 rings. Combine that with a 12-27 cassette or freewheel and you'll have plenty of range. Going to a triple presents a few problems: They don't shift as well as a double. You have a short cage rear derailleur so max ...


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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 ...


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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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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 ...


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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 ...



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