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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 10-28-10, 10:35 PM   #1
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I saw this and... What the...?




What the hell is the point of this? Dual drive?
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Old 10-28-10, 10:38 PM   #2
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i saw this too.

'only person in the world'

what a rip off.

oh, craigslist
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Old 10-28-10, 10:44 PM   #3
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is one single speed and one fixed?
i remember reading about a dual drive track bike sometime ago. the singlespeed side had a bigger cog to accelerate faster, and the locknut on the fixed side was spaced so that a few revolutions of the wheel would spin the fixed cog into the lockring.
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Old 10-28-10, 10:46 PM   #4
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I bet he goes twice as fast!
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Old 10-28-10, 10:52 PM   #5
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Originally Posted by Darth_Firebolt View Post
is one single speed and one fixed?
i remember reading about a dual drive track bike sometime ago. the singlespeed side had a bigger cog to accelerate faster, and the locknut on the fixed side was spaced so that a few revolutions of the wheel would spin the fixed cog into the lockring.
no, its dual fixed, which is redundant.
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Old 10-28-10, 10:53 PM   #6
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Reminds me of a thread about a month ago.

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Originally Posted by ppc View Post
I just came across this page that deals with the bizarre idea of running two chains on a bike, when I read the following nugget at the end of the page:

However it got me thinking about another bike I'd seen with a similar set-up but this one made a lot of sense. In 1982 Canadian rider Jocelyn Lovell rode the kilometre time trial at the World Championships in Leicester, England using a bike with two transmissions. His arrangement gave him two gear ratios, a lower gear to get away from the line and a higher gear that kicked in after about seventy metres. His ride in Leicester wasn't as good as he hoped for but the transmission worked well and it could not be faulted by the UCI commisaires.



Jocelyn's bike had a freewheel sprocket on the normal right hand side and a fixed sprocket on the left hand side. As he moved away from the line he drove through the RH sprocket and the left hand fixed sprocket began to unscrew from the hub. It being of smaller diameter it turned at a slower rate than the RH sprocket and being on the "wrong side" of the hub it would naturally unscrew. After about seventy metres the LH fixed sprocket came up against the lockring and at that point drive was through the LH side and the RH sprocket freewheeled. The distance traveled before the higher gear engaged could be adjusted by setting the position of the lockring. The bigger the space between lockring and sprocket at the start the longer the distance before the higher gear engaged.
Jocelyn experimented for some considerable time to come up with a combination of sprockets and chainrings that would not only give two suitable ratios but that would need chain lengths that would be at the correct tension. He settled on a low gear of 42x13 (87.2") and a high gear of 53x15 (95.4")


Wow, that is incredibly clever and a very elegant working around (or within?) the UCI rules. Lovell was a genius. I'm almost tempted to try it myself to see what it feels like

(There's just a small misunderstanding of how the system worked in the above explanation: the LH sprocket unscrews because it is smaller and thus spins *faster* than the wheel in the first 70m, not slower)
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Old 10-28-10, 10:53 PM   #7
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Originally Posted by Darth_Firebolt View Post
is one single speed and one fixed?
i remember reading about a dual drive track bike sometime ago. the singlespeed side had a bigger cog to accelerate faster, and the locknut on the fixed side was spaced so that a few revolutions of the wheel would spin the fixed cog into the lockring.
Yeah pretty sure it's not that.
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Old 10-28-10, 10:55 PM   #8
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http://sfbay.craigslist.org/sfc/bik/2030599953.html

price isnt too bad actually
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Old 10-28-10, 10:58 PM   #9
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I was thinking about this awhile ago, what if you did that with two freewheels? Would you be able to ride forward, backward, AND coast? My head asplode
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Old 10-28-10, 10:58 PM   #10
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dual drive...this makes the frame so stiff and responsive its amazing!
Wut
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Old 10-28-10, 10:59 PM   #11
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I was thinking about this awhile ago, what if you did that with two freewheels? Would you be able to ride forward, backward, AND coast? My head asplode
No, it would be the same as a fixed gear.

Grab your geared bike and roll it backwards.
Watch the cranks.
That would happen.
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Old 10-28-10, 11:01 PM   #12
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No, it would be the same as a fixed gear.

Grab your geared bike and roll it backwards.
Watch the cranks.
That would happen.
I dunno man.
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Old 10-28-10, 11:03 PM   #13
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seent it so i had to buy it
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Old 10-28-10, 11:40 PM   #14
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Hey drive side photo FTW!
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Old 10-28-10, 11:47 PM   #15
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I want that frame for my girlfriend.
Coolest dual drive bikes are the ones that are set up so when you ride forward its one gear, but pedal backwards and its another.
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Old 10-28-10, 11:47 PM   #16
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Hey drive side photo FTW!
I know! Idiot proof!
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Old 10-29-10, 12:02 AM   #17
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More power!!!
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Old 10-29-10, 09:22 AM   #18
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I was thinking, and If there was a place to hook the chain, and those two were geared different, you could just take off one side of chain if you needed to go up a really long hill, 2 gears without the flipping and flopping
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Old 10-29-10, 09:42 AM   #19
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Old 10-29-10, 01:06 PM   #20
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Whoever gets this should set the crank arms in phase with each other so they can double pump. Then they'd be two times as fast as two times as fast as a normal fixie!
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Old 10-29-10, 02:24 PM   #21
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http://www.municycle.ca/nimbus-perfo...ffe-p-112.html

giraffe unicycles have had dual drive for long.
This is meant to avoid the flex of the frame and pulling the wheel out of alignement when you mash on the pedals.
Though this has proven to be useful on unicycle, i doubt it is on a fixie.
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Old 10-29-10, 02:33 PM   #22
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Dude should mount both crank arms pointing in the same direction. Kangaroo bike FTW.
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Old 10-30-10, 03:36 AM   #23
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Dude should mount both crank arms pointing in the same direction. Kangaroo bike FTW.
this
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