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[Closed] backwards pedalling fixed gear
Somewhere I've seen pictures of the chain arrangement necessary to allow a rider to pedal backwards but for the bike to move forward - some sort of weird figure of eight / two cog set-up on a fixed gear. Google is not being very helpful probably because I'm not really sure what I'm searching for!
Anyone got any pictures/have any clue what I'm talking about?
Cheers
There was an early design where you would have two gears - a forward pedalling one, and a backward pedalling one. The chain arrangement looks like a figure 8 streched around the rear cog at the middle. I am trying to find pics...
[url= http://fatcyclist.spaces.live.com/Blog/cns!1pUmGvi9idWgOodsIbhHUOQA!3136.entry ]Here's one [/url], do I get a prize? 😀
Surely it'd either need a fixed cog and a freewheel on the same hub, or some means of bending the chainline out and back in halfway between the two.
And a saddle positioned much further back to provide any kind of meaningful 'oomph'.
I like your classic last-day-at-work train of thought.
I built one a few summers back. Good for cruising about but not an ideal bike. Some years ago they developed proper gears, you see. You can fudge it with a screw on freewheel hub and use an old reversed BB cup to give you the thread depth to run x2 freewheels.
Ian Munro off here made one once I think. The fruitloop 🙂
Personally, I don't think you see enough backwards-pedalling hill-climbers.
@mtbfix, can you hack the freewheels so that each has only one cog on? (Just wondering exactly what this fudged solution would look like...)
Thanks holyhutzpa, that's the one. 🙂
Rob Hayles had a track bike with that set-up, he rode it for a couple of show-off laps at Revolution once.
@mtbfix, can you hack the freewheels so that each has only one cog on? (Just wondering exactly what this fudged solution would look like...)
I used two single sprockets, not cannibalised freewheels. They have to be able to rotate independently.