[cbman]

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.

[Industry_Hack]

Can I sign your cast?

[cbman]

Originally Posted by Industry_Hack

Can I sign your cast?

HAHA everyone's like "you are so going down on the thing" it's much more stable than it looks... I hope.

[Doohickie]

Before you ride this thing downhill, watch this.Bicycle Downhill The good bit starts at about 45 seconds in. It brings Industry Hack's comment into perspective.

[fleeter]

won't your rear wheel pop out once you hit a good bump?

[cbman]

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

[Industry_Hack]

The wheel doesn't need to fly off to cause issues. If it even shifts in the dropouts...

Can I sign your cast?

[Doohickie]

45 seconds in, I'm tellin' ya...

[retromike3]

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

[TxCyclist]

So how do you sit on that cycle?