DIY Bike and Trike Plans

  • Gravity Bike racer - England, UK
    John "Doc" Warner shares some photos of his modified bicycle for Gravity Bike competitions. Named "Hee-Bee GB II", Doc built the gravity bike for a competition this past May.

    What is a gravity bike?

    A modified bicycle with a frame that's low to the ground to reduce wind resistance and the center of gravity. It has narrow handlebars, no pedals or chains, front and back disc brakes, knee rests and long foot pegs so the rider stretches out horizontally.

    The goal is to descend steep downhill courses to reach insane speeds, often exceeding 90mph. This extreme sport has been gaining popularity worldwide for more than three decades and Gravity Bike races are held around the world.

    Competitors wear helmets (some races require full-face), leathers, speed suits, gloves, footwear, and elbow and knee pads. According to Doc, "It's a great sport, very cheap (to build and compete), fantastic fun, and very accessible to all abilities and ages. Perfect for DIY/home-builders. You can build a competitive bike for around £60/$100 (but) you can, of course, spend less, or much more.

    "This is my first Gravity Bike build. I made it earlier this year to enter the 2014 Penn House Gravity GP and finished second overall (Streamlined Buggy beat me by just over a second)."

    See more pictures of Doc's Gravity Bike in the builders gallery.
  • Recent Forum Posts


    Re: Pics of my Warrior

    You feel the bumps, so I don't go off road. It's very easy to manoeuvre with the USS, so I can usually avoid bumps and ruts. My next build will have suspension.

    willym Today, 08:47 AM Go to last post

    Re: Pics of my Warrior

    Very cool. I'm starting to build one of these soon, but considering incorporating a rear suspension. How rough does your ride without suspension?

    Toyguru Today, 12:31 AM Go to last post

    Re: Started my build, a few pics

    ...and I'm speaking about the pic posting! Painting looks good!


    hape03 Today, 12:30 AM Go to last post

    Re: Pics of my Warrior

    Thanks. I made the seat. ½ inch EMT welded together with 3 cross braces. Phifertex fabric with EZ Lace binding, stitched by my wife on her Sears sewing

    willym Yesterday, 09:05 PM Go to last post
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