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: Tour-ettes trike syndrome.

    ....I must say, that looks too good to be going to the knackers yard......

    FrankCrank Yesterday, 08:53 PM Go to last post

    Re: Welding injuries to eyes

    ....I did experience arc-eye many years back, on a few occasions, and it's not a pleasant thing at all. I use a flip mask for all my TIG welding, and

    FrankCrank Yesterday, 08:50 PM Go to last post

    Re: Welding injuries to eyes

    First off- Welding will still burn your eyes if your not careful. Best advice I can give is use a Name brand Helmet Lincoln or Miller make great helmets.

    darnthedog Yesterday, 08:01 PM Go to last post

    Re: Welding injuries to eyes

    Arc eye hurts for days .

    Only advice i can give is , set the mask at its highest settings and give it a try coming down a bit at a time just

    Twinkle Yesterday, 07:55 PM Go to last post
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