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Old 04-26-08, 05:50 PM   #1
akaerik21
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2 chains

a buddy of mine is putting togeather a bike w/ two chains. why i dont know i guess to be diffrent which is cool. but my q? is weather this has already been done and to what kind of sucess?
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Old 04-26-08, 06:30 PM   #2
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I'm pretty sure I've seen it done, but couldn't begin to tell you where. They also make a giraffe unicycle (the tall kind) with double chains.

Here's one link I found, though probably not what he's doing:
http://www.sheldonbrown.com/bichain-fixed-free.html
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Old 04-26-08, 07:16 PM   #3
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no not quite but still two chains. im pretty sure hes keeping his chainrings the same size. buy the way how about that link to tho the finger being choped off, iv been bit befor but thats REAL BAD
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Old 04-26-08, 07:47 PM   #4
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As to the success of this- assuming he can round up the hardware to make it work, I don't see why it wouldn't work. (I also don't see a benefit, other than cosmetic.) Obviously, the more identical the chains and sprockets, the smoother things are going to be.

Good luck finding that left-side chain guard!
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Old 04-26-08, 08:11 PM   #5
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It's been done--they used a bendix three wheel hub that had a sprocket on both sides.You can also do it with those BMX south paw hubs and freewheel.Gearing has to be same on both sides are one will just over run the other.
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Old 04-26-08, 09:55 PM   #6
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I've thought about doing this, but haven't yet. It's a good idea if you're riding a fixie without brakes mounted. I saw a friend's chain break when he was flying down a hill, with busy intersections coming up fast. He tried to stop before the red light, but that is when his chain broke. He just about wet himself, but at least he made it through without getting tagged by cross traffic. But if he had been riding with two chains, he might not even have noticed. I'd think it would also induce less stress on the frame, since both sides of the hub will be under power equally, and therefore there will be less twisting torque applied to the frame. Perhaps I wouldn't have snapped my driveside chainstay on one of my bikes, or the seat tube down by the bottom bracket on another. And heck, since you've got two chains there's probably like 1/4th the chance of either one breaking since there will be so much less stress on each, as they'll each be dividing the load.

A flip flop fixie hub, and a set of tandem cranks (so there's a spider on both sides AND proper pedal threading), and two identical sets of chainrings and cogs and you'll (he'll) be good to go.
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Old 04-26-08, 11:30 PM   #7
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Old 04-27-08, 06:00 AM   #8
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How in the world could a steel chain break?I mean they are steel.
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Old 04-27-08, 06:15 AM   #9
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Usually a pin pulls out of the sideplate and everything comes apart very quickly after that.
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Old 04-27-08, 06:36 AM   #10
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im almost positve hes `useing a tandom crank and flip flop fixie hub. ill have to post some progress pics
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Old 04-27-08, 12:50 PM   #11
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Well someone did 3 chains on one side before.
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Old 04-28-08, 09:34 PM   #12
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seen it done...not that impressive
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Old 05-23-08, 07:47 PM   #13
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Quote:
Usually a pin pulls out of the sideplate and everything comes apart very quickly after that.
How? the pins are tight,very tight.
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Old 05-23-08, 08:13 PM   #14
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when a chain is pulled too tight the hoels in the sideplate stech out makeing the pin looser, then it all goes downhill from there
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Old 05-25-08, 12:58 AM   #15
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when a chain is pulled too tight the hoels in the sideplate stech out makeing the pin looser, then it all goes downhill from there
Im 250lbs and my chains never break,I of course throw them out when they stretch,maybe if you ride until the gears get damages they may break.
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Old 05-25-08, 05:16 PM   #16
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It might be interesting to have two different chains rotating two different wheels, instead of the same one. Maybe even change the frame so that it would actually help propulsion.
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Old 05-25-08, 08:49 PM   #17
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I went searching on Velospace for two chains, bu twaht I thought I was looking has nothing to do with two chains BUT it is darn interesting.
Just search on Velospace for RETRO DIRECT.
Boggles the mind
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Old 05-26-08, 10:36 AM   #18
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sounds like a fixie hub would do what he's talking about.
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