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Alt Bike Culture Chopped, dropped, stretched, lifted, and otherwise cut up and put back together. The art and science of choppers, cruisers, lowriders and the vast world of mutant bicycles.

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Old 05-07-07, 07:51 PM   #1
Johnny Payphone
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"Long Chainey"

Tired of those same-old choppers where the rider is above the fork, I designed an underslung chopper...

It lives! This bike is finally rideable, and it's fast! The rear wheel acts as a gravity motor. It powers up hills and turns like a train. I towed a trailer 140 blocks the other day loaded with a tallchopper... I've commuted on a triple-high but never felt compelled to wear a helmet in my life, but this bike scares me enough to make me put on a nugget-bucket. It's motorcycle mass moving at motorcycle speed.



I made the wide bottom bracket out of a pipe and two flanged bearings, then I cut a bottom-bracket spindle and welded it on 3/4" solid rod. The chain ring and crank assembly is spaced left-right with washers.

Here's the fatback kit, looking up at the derailleur. I just made a plate so I can swap out the rear wheel if I find a single twenny-fo'.



You can ride a passenger on the pipes:



The headset and rear axle are set on six-dolla-holla Northern Tool pillow block bearings:



There's some weird science going on with this underslung system...

-when the rear wheel hits a consistent rough pattern it sets up harmonics in the fork and the front wheel skitters all over the road

-it eats bumps and drops alive but riding down a 3/4" seam in the street will toss you on your side

-looking at the bottom of your fork is really weird. But you don't really see the frame because you go perfectly straight such a small percentage of your ride.

The bike's name is "Long Chainey" and it is incomplete. I still need brakes.

please keep this thread on-topic

Last edited by Johnny Payphone; 05-08-07 at 12:40 AM.
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Old 05-07-07, 08:32 PM   #2
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How fascinating. I'd love to see it in motion, but Chicago is a really long bike ride from here.
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Old 05-07-07, 08:49 PM   #3
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Totally insane! I love it
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Old 05-07-07, 09:21 PM   #4
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Oh my god! You totally need to take some video, Johnny.

I like the skull weld for the headset, haha.
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Old 05-07-07, 10:39 PM   #5
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You. Are. GOD!
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Old 05-07-07, 10:41 PM   #6
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That's unlike anything that I've ever seen.
Very impressive.
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Old 05-07-07, 10:52 PM   #7
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=G=E=N=I=U=S=

I wonder if a big, fat 29" MTB tire stuffed on the at rim might
help the wandering crack problem ??
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Old 05-07-07, 11:06 PM   #8
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nice, I want one!
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Old 05-08-07, 12:15 AM   #9
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is nobody gunna mention how ****ty the welds are, I mean egads!
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Old 05-08-07, 04:53 AM   #10
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I totally need to ride that. Maybe it's just me, but I can't see where the bars are? I mean, they must be above your head, at the top of the.....the.......I wanna say fork, but I'm not sure it really is! Anyway, I can't see them. Is the rear wheel braked at all?
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Old 05-08-07, 05:04 AM   #11
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Very cool bike.
A suggestion: if you put a street bike (motorbike) rear tire on, you will improve the handling a lot. That flat profile of your car tire would cause major handling/straight line problems.
Please keep posting pics.
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Old 05-08-07, 08:26 AM   #12
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Originally Posted by Capn ˇFUN!
is nobody gunna mention how ****ty the welds are, I mean egads!
I like the ones in the bottom picture, it looks like a face.
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Old 05-08-07, 09:11 AM   #13
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At first I thought it was three x's..

I dig that ish man.
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Old 05-08-07, 12:13 PM   #14
Johnny Payphone
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Quote:
Originally Posted by ebow3d
A suggestion: if you put a street bike (motorbike) rear tire on, you will improve the handling a lot. That flat profile of your car tire would cause major handling/straight line problems.
yes, but motorcycle tires are round, and then I wouldn't have a big flat car tire on my bike, which is the whole point.
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Old 05-08-07, 01:11 PM   #15
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Quote:
Originally Posted by Johnny Payphone
yes, but motorcycle tires are round, and then I wouldn't have a big flat car tire on my bike, which is the whole point.
You could over-inflate the car tire a little bit and get a similar effect.
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Old 05-08-07, 03:01 PM   #16
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picture of you on it for scale?
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Old 05-09-07, 07:17 AM   #17
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that is AWESOME!!!!!! ya gotta post video or at least some pix of it mounted. fast eddie outty
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Old 05-09-07, 10:55 AM   #18
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Damn, I REALLY want to check that out.
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Old 05-10-07, 01:49 AM   #19
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Quote:
Originally Posted by dmotoguy
picture of you on it for scale?
I hope he doesn't mind me leeching his bandwidth for this.
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Old 05-12-07, 04:52 PM   #20
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Now, it's just my opinion.. but...

I think I would like it a bit more if it looked like this:



and don't you worry about the crappy photo edit here..
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Old 05-12-07, 05:15 PM   #21
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Knalb-

I think a potential problem with your redesign would come when the steerer tube snapped in half and your forward momentum drew your recumbent carcass over the severed portion like a worm onto a hook.

Hmm. Actually, that would be pretty cool. Never mind. You get the first ride on the sport version of El Chaino.

Eric
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Old 05-12-07, 05:18 PM   #22
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Another idea for improving the handling might be to redo the fork with more rake. There's about 18 inches of trail there. Wheel flop city.

Wait a minute. What have I seen so far in my life to indicate that Johnny Payphone gives a pizzle about fine-tuned handling?
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Old 05-12-07, 06:12 PM   #23
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Sure, there is potential there to make it a wild ride in the event of failure, but you only live once right?

On second thought, I would like to keep some of my lower extremities. I still think it looks better without the bar in the way, but maybe with some different material it would be less prone to snaping in half.
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Old 05-12-07, 07:43 PM   #24
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it handled well when i got scooted along on it im sure the ride is even better
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Old 05-14-07, 12:58 PM   #25
Johnny Payphone
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Quote:
Originally Posted by Roll-Monroe-Co
Another idea for improving the handling might be to redo the fork with more rake. There's about 18 inches of trail there. Wheel flop city.
That is the appropriate amount of rake for a dragster. This thing is fast and turning is mainly done by leaning. True the fork flop doesn't allow for tight turns, but all you gotta be able to do is turn around in the street, right? That's how biker gangs choose the length of their choppers.

The other day I scraped my axle on the ground during a turn and kept on rolling!

You have to realize this thing handles extremely well. It's quick and comfortable for long rides. It hauls trailers like they were made out of paper. I can track stand on it forever thanks to the wide wheel. Basically what it doesn't do is a) go slow or b) stop.
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