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passenger rigs

Old 02-14-06, 01:48 AM
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rabbitt
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passenger rigs

Hi, this really doesn't fit into any category in particular, but i was wondering if anyone has ever made a passenger rig for their single person bikes. i don't mean something like xtracycle, i mean like a rear rack and pegs in the back or something of that nature. i was also wondering, for all you gearheads out there, if there are dangers involved with the rear axle getting bent and the wheel warping and such. i don't plan to carry passengers over 120ish and i weigh 133. i know a really beefy frame would be vital. is there any other way to strengthen it? i know this might sound like a really crazy thread with things like xtracycle around, but it's gonna get even crazier: i want to do this on a singlespeed; you heard me, a singlespeed! i appreciate your responses (no matter how brutal they may be). thanks
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Old 02-14-06, 02:37 AM
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i mean something pretty much exactly like this.
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Old 02-14-06, 05:00 PM
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ken cummings
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The International Human Powered Vehicle Association has covered stuff like that for a long time. The California Vehicle Code does too. "All persons on a bicycle shall be on a properly desinged seat or saddle."
So standing on axle pegs like BMXs use in right out. Also having 120 lbs on or behind the rear wheel is unstable unless you have a trailer or reeeelly long wheel-based recumbent. Pedicabs are trikes with the pedaller in front and the passenger(s) between the rear wheels. Usually. Counterpoint tandems like those at Angletech cyclery are an unusual answer. Passenger can help or coast. Got any design ideas?
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Old 02-14-06, 07:33 PM
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I did this. Rear rack + BMX pegs on fixed gear bike. It works but it's rather unstable. And illegal, though that's irrelevant to me.
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Old 02-14-06, 09:46 PM
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what do you mean by "unstable"? you mean the frame will bust, or it will be really hard to steer? seggybob, that's exactly what i was thinking, but will the rear rack hold? thanks for the input. couldn't you make a "legal" seat out of the rear rack and some pillows or something?
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Old 02-14-06, 10:53 PM
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I'm not sure exactly how to describe it. Not a structural problem though. It's significantly harder to steer, and it feels really wobbly at low speed. This wobbliness makes it a bit hard to get started. It's also a bit tough to get the passenger balanced initially. At higher (>10mph) speed it seems to stabilize, but sharp turns can't be taken.

I used a rather cheap looking rack I got for $5 from an old guy, which held alright. Weight was distributed between the rack and the pegs. A guy at the LBS told me that there was a significant chance of the axle bending and that I should get a hub with a 14mm axle. I did this eventually, but I don't think it was worth it (it really should be fine unless they're standing up on the pegs instead of sitting).

I don't know what qualifies as a 'legal' seat but I think the intention of the law is to prevent more than one person from riding on a one-person bike design, though examining the actual law would probably be useful.
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