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PostPosted: Wed Mar 04, 2009 10:07 am 
Posh Mark
Posh Mark
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Joined: Wed Apr 18, 2007 2:49 pm
Posts: 5980
Location: As far from the city as you can be ....
Shamelessly taken from the STW website:

http://www.singletrackworld.com/2009/03/freak-of-the-week/

Image


Image


:shock: :shock: :shock: :shock:

Kinda cool 8)

More here >>>> http://www.onefgear.co.uk/OneFgear/Welcome.html


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PostPosted: Wed Mar 04, 2009 10:23 am 
Retro Guru

Joined: Tue Feb 06, 2007 5:50 pm
Posts: 946
Location: Over there -->
I think that'll be the rumoured "reversi two speed" system - one gear when pedalling forwards, another one when pedalling backwards.

Look carefully at the chain to see what I mean.


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PostPosted: Wed Mar 04, 2009 10:30 am 
Retro Guru
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Joined: Tue Aug 07, 2007 12:22 pm
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Location: Platsa, Messinias, Greece
grahame wrote:
I think that'll be the rumoured "reversi two speed" system - one gear when pedalling forwards, another one when pedalling backwards.

Look carefully at the chain to see what I mean.


Although this particlar example seems to have both sprockets the same size ????


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PostPosted: Wed Mar 04, 2009 10:32 am 
Retro Guru

Joined: Wed Jun 13, 2007 11:10 am
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Location: Reading way
I built one of these a few years ago. Great novelty bike but the reverse pedalling action takes a bit of getting used to and offers little advantage. Those STW swine following my lead, again!


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PostPosted: Wed Mar 04, 2009 10:53 am 
Old School Grand Master
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Very clever, but also very pointless. What happens if you have to move the pedals to a different position when you're starting off?


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PostPosted: Wed Mar 04, 2009 12:17 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8202
Location: New Forest, UK
It works. I saw a guy on one riding the Round IOW last year (a 1920's French bike which weighed about 40lb, complete with string of onions).

He had done the last PBP on it INSIDE the time limit! :shock: :shock: :shock:

But it's really odd seeing someone pedalling backwards!

The only thing you cannot do is roll the bike backwards - this locks the back wheel.


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PostPosted: Wed Mar 04, 2009 12:38 pm 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
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Location: kent
Yep , the french bike is called a Hirondelle and was made at the beginning of the 20th century .


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PostPosted: Wed Mar 04, 2009 1:48 pm 
MacRetro rider
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Joined: Fri Feb 09, 2007 4:16 pm
Posts: 8658
Tried one of those myself.
The difficulty is mounting two freewheels side by side. The inner one cannot have removal slots as this would stop the outer one being installed.
The screw on hub threads can be extended by overlapping the inner freewheel threads between the hub and a right hand bottom bracket cup onto which the second freewheel can be mounted.
Remember to have the freewheels of the same pitch, 1/8" pitch beside a 3/32" does not work :oops:
I found low gear in normal direction pedalling to get the bike going with higher gear in reverse worked best :wink:


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PostPosted: Wed Mar 04, 2009 3:20 pm 
rider | rBoTM Winner
rider | rBoTM Winner
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Joined: Fri Jan 25, 2008 1:42 pm
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Location: Wakefield, Yorkshire
As seen in the book 'The Dancing Chain' as an early multi-gear design early in 20th century in France as mentioned above.

Never seen one in use though. Interesting use of a chain tensioner.


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PostPosted: Wed Mar 04, 2009 5:10 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8202
Location: New Forest, UK
I'd think you'd be better off putting in something like a Schlumpf mountain drive instead - would look neater and less like something that Wallace and Gromit came up with. :wink:

http://www.kinetics.org.uk/html/mountain_drive.shtml


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