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How to redirect Bicycle chain? Answered

I'm working on a [secret] project that involves a recumbent bicycle. I'm going to have to use a long, tandem bike chain. The problem is, the pedals are going to be mounted at approximately a 32-43 degree angle to the rear axle, with an obstruction (me and my seat) in the way. Is there a way to some how redirect the chain, so that it would go under me? Thanks!

Discussions

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upnorthrick

10 years ago

Can you run the chain over rather than under the rider?

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Branupnorthrick

Reply 10 years ago

No, not with my current design.

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Lftndbt

10 years ago

Yes... yes there is... many, many ways... Two small fixed cogs on cross member's, or de-railer's (spell?) would be good for the tension adjustment... Just on a side note:- How much room "under" you are we talking?? The gear cluster if located at the base of your spine may provide enough of an angle to devert the chain.... I'd be trying to kill two birds with one stone so to speak and locate the gears close enough to rectify your clearance problem... ;) Hope that helps... maybe not... :)

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BranLftndbt

Reply 10 years ago

Lemme get a diagram of my drawing up (might be a little while, my Dawgs are coming on). Derailleur is how you would spell it. I believe it is French, but I could be wrong. Thanks for the help.

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guyfrom7up

10 years ago

maybe something like A channel with ball bearings along the bottom so that the chain both rotates with the channel and there's very little friction because of the ball bearings

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Branguyfrom7up

Reply 10 years ago

I'm sorry, I don't quite understand....

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guyfrom7upBran

Reply 10 years ago

something like this There's a metal channel, you put a strip of ball bearings in, the chain goes on top. You warp and bend the channel to fit around whatever. Make sure the chain is perfectly tensioned. You might want to put something on both walls to. You might not even need a channel, just put some eyelets screws around and feed the chain through, you might want to use a type of bearings, too.

ball bearing channel.png
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guyfrom7upguyfrom7up

Reply 10 years ago

I couldn't add notes, but the red is the ball bearings, the gray is the chain, the black is the channel, the left one is a front on view and the other one is a birds eye view. The right image doesn't have the chain so you can see the bearings