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Old 06-25-07, 09:26 PM   #1
soundless
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bike wheel axle

i am building a 4 wheel bike that i am intending to have 2 wheel drive. i want to connect two bike wheels together on an extended axle. does anyone have any insight on how i might go about doing such a thing?
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Old 06-26-07, 02:09 PM   #2
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Yes.
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Old 06-26-07, 02:22 PM   #3
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and will you shed some light on it
for me?
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Old 06-26-07, 02:47 PM   #4
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No.
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Old 06-26-07, 03:12 PM   #5
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check out the trikes out there. I think most are single wheel drive but you might get an idea for doing two wheel drive (2 chains, one for each wheel?).

good luck
cdr
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Old 06-26-07, 06:48 PM   #6
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You are going to need a differential between the two driven wheels unless you never plan to turn.
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Old 06-26-07, 07:07 PM   #7
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You are going to need a differential between the two driven wheels unless you never plan to turn.
naw, you could get away with scrubbing a tire on a bike, no biggie
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Old 06-27-07, 06:04 AM   #8
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Let me be a little more elaborate in my answer:

You're building a car. You are encountering the design problems that car developers encountered over a hundred years ago. Go read up on car development.

This is a bicycle forum. No one here has dealt with those issues in the context of bicycles, simply because they don't occur with bicycles.
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Old 06-27-07, 08:46 AM   #9
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For an absurd version of what you are proposing, find the latest issue of Adventure Cycling's magazine. There is an article by a guy who built a 4-wheel, pedal powered COUCH. Yes, a couch, or more accurately, a Love Seat. It's a wonderful illustration of the saying "not everything that can be done, should be done."

BTW, there were pedal-powered commercial 4-wheel cars in the past. I remember seeing ads for them in Popular Science and Popular Mechanics years ago.

Also, I've seen pedal powered 4-wheel vehicles in two and four seater form as rentals in vacation areas. Most recently I was in Cape May and Ocean City, NJ and several places rented them. They weigh a ton and won't climb worth a damn but they are available. Maybe a Google search would turn up the maker(s).
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Old 06-27-07, 12:14 PM   #10
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I should clarify my suggestion - since trikes with single wheel drive can coast the driven wheel, if you have two "driven" axles, each with the ability to freewheel, you should be able to replicate a cheap but effective differential. Only problem is no limited slip. But if you're worrying about that, you're long past the original question.

cdr
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Old 06-27-07, 12:17 PM   #11
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Have you posted in the alt. bike forum here? Those guys have built all kinds of things, and would likely have some constructive input for you. Best of luck to you on the build.
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