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gnar! gnar! gnar!
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179 Posts
Discussion Starter · #1 · (Edited)
OK, so I was looking around the internet and found a branch of biking called gravity biking. This is where people ride these small, aerodynamic bikes with no pedals down huge hills. I then found a site where a guy flipped a bmx frame upside-down to make one of these cool bikes, and thought I would try it myself. I don't have any bmx bikes but I do have a 13" Gary Fisher tarpon. I removed the chain, switched the headset bearing cups, and flipped the forks. I also put a different set of handle bars on so they would be lowered, put the old rack on upside-down to act as a seat, and have yet to remove the cranks. I also added some foot pegs. I did some geometry and the trail measurement on the flipped frame was triple that of the normal frame. This will make the bike excellent at what it was made for, being extremely steady at high speed in strait lines.
 

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Older than Hack
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147 Posts
Before you ride this thing downhill, watch this.[ame="http://www.youtube.com/watch?v=ZNwmpLPhoHw"]Bicycle Downhill[/ame] The good bit starts at about 45 seconds in. It brings Industry Hack's comment into perspective.
 

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gnar! gnar! gnar!
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179 Posts
Discussion Starter · #6 ·
no because the rack is attached to the frame and the rear skewer so even if it does loosen the wheels can never fly off
 

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retromike3
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274 Posts
gravity bike?

I built a gravity bike out of a BMX bike. I used plates I had bolted to the bottom bracket to rest my knees on and a set of arrow bars for the front. Mine worked grate and I took it down the steepest hills in town. The only problem I had was that I would go though a pair of TUFF Pads(I used two front tuff wheels) every time I used it and I had to wait quite a wile before the pads stopped stinking. It was going so fast that they would melt.

This particular bike is set up as a joke right? You cant rest on the crank unless your into pain and maybe this is not the right forum for that kind of behavior.

Mike Frye
 

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Registered
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14 Posts
I dunno maybe I'm Crazy like CB is but I actually see this thing working. While the frame is higher he'll be laying lower on it which should help the center of gravity issue if not actually improve it from a standard bike. Sid he has yet to remove thje crank, Which means it's coming off solves the issue brought up earlier A good set of brakes and it'd be set I'm behind him on this working
 

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SMILEY CAR
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191 Posts
Not gonna lie, that looks so fun. However, I would wear MX armor and an off-road full helmet rather than a regular bike helmet, lol.
 

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Slowin it up.
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4,299 Posts
What's up Tarukai? Haven't seen you in a while. Right. I think it's more dangerous than standard safety options could cover.
 

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The Bearded Wonder
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561 Posts
What's up Tarukai? Haven't seen you in a while. Right. I think it's more dangerous than standard safety options could cover.
...which makes me wonder why the guy in the clip wasn't wearing a face shield... I thought that was pretty dumb
 

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retromike3
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274 Posts
cast?

I was thinking more like signing the guestbook at his funeral. If you actually ride a bike with no saddle and no pedals. With the bars pointed down and sharp bits pointed at your groin I don't see that as a sport with much of a future.


Mike Frye
 

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Slowin it up.
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4,299 Posts
The future of gravity biking will be a generational thing. It's like learning to fly, a lot of people have to die to get it right.
 
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