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Coaster Brake vs Fixed Gear SKIDZZZZZ

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Coaster Brake vs Fixed Gear SKIDZZZZZ

Old 10-13-09, 02:27 PM
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wearyourtruth
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Coaster Brake vs Fixed Gear SKIDZZZZZ

why is it that locking up the rear wheel on a coaster brake is so much easier than locking it up on a fixed gear? on a coaster brake (with similar gearing) i can lock up the wheel with ease, in sandals, seated, sipping my mocha lattechino grande... yet on my fixed gear i gotta either be clipped in and at least stand up, or i gotta put the nuts on the stem. either way it's much more difficult.

i don't know exactly what's going on in a coaster hub, but it's still backpressure on the pedals locking up the rear wheel. what's the difference? what's the coaster hub doing?
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Old 10-13-09, 02:34 PM
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The coaster hub translates backpressure on the pedals onto a drum braking mechanism, not directly into the drivetrain like on a fixed gear.
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Old 10-13-09, 02:40 PM
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yeah but how does that compound the force exerted from my legs into the force needed to skid?
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Old 10-13-09, 02:40 PM
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:/
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Old 10-13-09, 03:01 PM
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Ya know the caliper / V-brakes some nerds use? And how they can skid a wheel just using their FINGERS?

It's kinda like that.

Friction, and leverage. That's how a coasted brake works better than backpressure on a fixed drivetrain.
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Old 10-13-09, 03:09 PM
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Originally Posted by wearyourtruth View Post
yeah but how does that compound the force exerted from my legs into the force needed to skid?
Because the mechanism inside the coaster hub provides mechanical advantage.

Look up an exploded diagram of a coaster hub if you really want to understand.

Here, I'll even look it up for you.

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Old 10-13-09, 04:48 PM
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i'm not trying to be a dick or anything, but you need to take a look at the mechanism. Your ability to coast and line up the cranks to provide stopping power help as well. There are two brake shoes inside the hub of a coaster brake, and when you activate it there is a mechanism that forces the shoes to expand against the hub creating friction and slowing you down.



those brake shoes inthe picture expand against the hub. see how when you back pedal or rotate the brake arm that it pushes those shoes against the cone shaped thingy(clutch)? yeah that forces the shoes outwards and to rub the hub.
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Old 10-13-09, 05:49 PM
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i understand how a coaster brake works. i've disassembled and repaired them before. i understand the concept of foot goes back - pressure turns screw (driver) - screw drives cone (clutch) - cone pushes shoes outwards onto hub.

i see what ryan is saying about mechanical advantage and i understand that a mechanical advantage is happening, i was just curious as to more explanation as to what exactly this mechanical advantage is and why it works so well.

i also understand the basic concept of mechanical advantage (i think). i understand that, for instance with a lever, with the pivot in the middle, to lift weight (or counteract force) 'x' you need to apply force 'x' to the other side. if you extend the lever out farther on your side, you can apply a force less than 'x' to lift the same weight, compensated by the mechanical advantage of the lever. i understand a lever, i understand a screw, i understand a pulley. i'm not yet understanding a coaster brake (which is obviously more complex)

Last edited by wearyourtruth; 10-13-09 at 05:59 PM.
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Old 10-15-09, 04:09 AM
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the reason a coaster brake is easier to skid with is, as everyone's said, b/c you have a mechanical advantage. This comes about due to the differences in gearing.
With a fg, with 70 GI, the rear wheel moves almost 3 times faster than the cranks are rotating. So, it takes a heck of a lot of energy to stop the wheel with the relatively small amount of leverage.
A coaster brake, however, is geared to make it easier to stop. The backward movement of the pedals only has to move the pads of the drum brake up to the surface of the drum. My uneducated guess is that the brake pad, being located as close to the drum as is reasonable, would move less than 1mm for every cm that the pedals move backwards.
3:1 gearing --> 1:10 = much easier!
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Old 10-15-09, 04:30 AM
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successful troll is successful
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Old 10-15-09, 06:04 AM
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**** coaster brakes.
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Old 10-15-09, 06:36 AM
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Originally Posted by feetpower View Post
**** coaster brakes.
Disagree. Coaster brakes are awesome.
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Old 10-15-09, 06:50 AM
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Really? This thread????
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Old 10-15-09, 06:55 AM
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I did the weirdest thing while driving to work this morning. I shifted my transmission with my hand from inside the car.
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Old 10-15-09, 09:17 AM
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Originally Posted by the_don View Post
Really? This thread????
BFSSFG: A flummoxing mistress.
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Old 10-15-09, 10:10 AM
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Found a fixie on CL the other day that was so cheap I just had to buy it. Went to pick it up and it turned out to have a coaster brake. Bought it anyway. Thinking i am going to keep that coaster brake wheel for bar nights and such. Its really kind of fun, thou it makes you look like an ass. But maybe less of an ass than someone with a Track specific frame set up ss.
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Old 10-15-09, 11:49 AM
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Isn't there something to be said about the forward momentum of a fixed gear that makes it harder to lock up the wheel? Especially if you don't take enough/any weight off the back.
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Old 10-15-09, 12:40 PM
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It is assumed that a bike with a coaster brake would have the same forward momentum.
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Old 10-15-09, 12:50 PM
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Originally Posted by wearyourtruth View Post
i understand how a coaster brake works. i've disassembled and repaired them before. i understand the concept of foot goes back - pressure turns screw (driver) - screw drives cone (clutch) - cone pushes shoes outwards onto hub.

i see what ryan is saying about mechanical advantage and i understand that a mechanical advantage is happening, i was just curious as to more explanation as to what exactly this mechanical advantage is and why it works so well.

i also understand the basic concept of mechanical advantage (i think). i understand that, for instance with a lever, with the pivot in the middle, to lift weight (or counteract force) 'x' you need to apply force 'x' to the other side. if you extend the lever out farther on your side, you can apply a force less than 'x' to lift the same weight, compensated by the mechanical advantage of the lever. i understand a lever, i understand a screw, i understand a pulley. i'm not yet understanding a coaster brake (which is obviously more complex)
It seems you have answered your question and then re-asked it.
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Old 10-15-09, 01:36 PM
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Originally Posted by dsh View Post
It is assumed that a bike with a coaster brake would have the same forward momentum.
You have the same forward momentum, but none of that force is transmitted via the chain to the cranks when you stop pedaling. Y'know what with coasting and all.
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Old 10-15-09, 05:32 PM
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Originally Posted by Illin View Post
Found a fixie on CL the other day that was so cheap I just had to buy it. Went to pick it up and it turned out to have a coaster brake. Bought it anyway. Thinking i am going to keep that coaster brake wheel for bar nights and such. Its really kind of fun, thou it makes you look like an ass. But maybe less of an ass than someone with a Track specific frame set up ss.

most people don't need a brake for that
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Old 10-16-09, 10:26 PM
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I ride a coaster....on a frame with track geo.....I'm f****ing cool
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Old 10-16-09, 11:15 PM
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I want an Aerospoke with a coaster brake in it.
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Old 10-16-09, 11:21 PM
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why the hell would you want a coaster brake? its either brakeless or get a decent rim brake or a nice disc brake.

Last edited by feetpower; 10-16-09 at 11:24 PM.
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Old 10-17-09, 08:06 AM
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Originally Posted by feetpower View Post
why the hell would you want a coaster brake?
I'm neither pro or against the use of coaster brakes but I can recall asking a friend of mine, "Why the hell would you want a fixed-gear bike?" about three years ago.

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