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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 04-04-05, 11:01 PM   #1
wfisher
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Simplicity of coaster brake bikes...

However much I'd like to think that fixed gear bikes are so simplistic and barebones, in fact coaster-brake bikes are equally simplistic if not more because there are NEVER rim brakes on them while a lot of people ride fixed with brakes. Point being that our niche of simple, grassroots riding is conspiculously challenged by the popularity of lesiure coaster-brake bikes which look just as simplistic on the outside. Now I realize that a coaster brake hub has some internals that a normal flip-flop does not but it's a minimal difference from the outside. That's an observation, now a question: how in the world does a coaster brake work? Can anyone explain the internals?

Disclaimer: I got a lot of "big" words floating around in my head that I may not have used here correctly.
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Old 04-04-05, 11:07 PM   #2
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this is a jimv thread, he has some great pictures of a rebuild of a bendix.

but ill chime in a lil too... theres lots of different types of coaster brakes but they all basically do the same thing. there is some sort of clutch that is actuacted by back-pedaling, which engages a brake. there are mainly 2 kinds of clutch, a corkscrew style, and a roller-cam style. most of the brakes are a shoe style, but there are also plate style brakes. if you're really curious take one apart, they are pretty self explanatory.
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Old 04-04-05, 11:27 PM   #3
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Coaster brake hubs aren't a fixed gear. You can coast with one. The Shimano E-types, the common beach crusier rear hub, is very simple, with 15 parts in it. Those use a corkscrew to push a spring to push out a set of shoes like a drum brake. Shimano E-type is common and cheap, and I will probably get flamed for posting about it in this forum. A complete rebuild kit is around $8 wholesale, and the bearings are included and grease packed!
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Old 04-05-05, 12:21 AM   #4
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It's fixed/single speed. You're OK. I had to ask Trystero first time that I saw his bike if he'd gone fixed, but it was a coaster. There's probably a reason that they used them in a lot of movies where people were supposed to be riding track bikes - you really can't tell the difference until someone coasts...

What's the point in coasting anyways?
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Old 04-05-05, 02:30 AM   #5
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The point is two fold:

1. You can coast.
2. You can brake.

Thus the name.
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Old 04-05-05, 05:08 AM   #6
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Is Shecky still around?
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Old 04-09-05, 06:08 PM   #7
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Quote:
Originally Posted by legalize_it
this is a jimv thread, he has some great pictures of a rebuild of a bendix.

but ill chime in a lil too... theres lots of different types of coaster brakes but they all basically do the same thing. there is some sort of clutch that is actuacted by back-pedaling, which engages a brake. there are mainly 2 kinds of clutch, a corkscrew style, and a roller-cam style. most of the brakes are a shoe style, but there are also plate style brakes. if you're really curious take one apart, they are pretty self explanatory.
Thanks for the kind words. I made some drawings a while ago that help to illustrate what you just wrote. These show
a cone-clutch brake, but like you said, all brakes work basically the same way.

Take care,

Jim
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Old 04-09-05, 06:38 PM   #8
kurremkarm
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Quote:
Originally Posted by jimv
Thanks for the kind words. I made some drawings a while ago that help to illustrate what you just wrote. These show
a cone-clutch brake, but like you said, all brakes work basically the same way.

Take care,

Jim
You are one talented individual.
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Old 04-09-05, 07:57 PM   #9
wfisher
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Thanks for the illustrations. Now it's a lot clearer.
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Old 04-09-05, 08:05 PM   #10
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the coaster brake is minty fresh.
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