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