Gravity racer - Calling all daredevils!

Discussion in 'BUILD CHALLENGES' started by breakurnees, Jun 17, 2011.

  1. breakurnees

    breakurnees

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    Here's the deal...
    [​IMG]
    Build one of these http://www.instructables.com/id/Gravity-Bike/ using an existing bike or from scratch. 20" wheels only.

    Make it ratty and stylish as you can BUT you must post a video or photo proving you rode it using gravity only at a speed of over 35 MPH before September 12 (my birthday.

    If there is any interest, I will post up my before photo here and follow with a build. If not, I'll start a regular build thread.

    Come on and join me. I double dog dare you!

    [​IMG]
     
  2. weekend-fun

    weekend-fun

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    35mph??!! :shock:
     
  3. aka_locojoe

    aka_locojoe

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    Yeah geography will play a factor. I think 31mph is the fastest we've gotten on our hill.
     
  4. bicycleguy

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    What about changing the rules a bit and making it 20" or less? I like my gbikes with 16's because you are closer to the ground and have a lower center of gravity. I got up to 48mph on this one.

    [​IMG]
     
  5. scrumblero

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    do drift trikes count? :roll:
     
  6. breakurnees

    breakurnees

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    20 and under is fine. Don't know much about drift bikes, but if it is under 20 inches and gravity powered, then it should be fine.

    35 seems like a fair speed to me, but if you don't have the hills for it, 30 is fine. Lets get as many people as possible in on this.

    Who is in?
     
  7. scrumblero

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  8. breakurnees

    breakurnees

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    That looks like fun! Sure as long as it is built not bought.
     
  9. snydur

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    i have so many 20" parts and nothing to do with them . . .well till now. :mrgreen: to the drawing board!
     
  10. snydur

    snydur

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    [​IMG]
    002 by andrew snyder, on Flickr

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    001 by andrew snyder, on Flickr

    since school is out, i started a mockup. the black will be wood panels, one in the front, and two in the back. possibly a short cafe racer style fender, and really short triple trees. some stuff will be cut off tommorow. :roll: tires and rims are waiting
     
  11. breakurnees

    breakurnees

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    Rock on. I will try to post up some pics this weekend.

    How do you plan to stop that beast?
     
  12. snydur

    snydur

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  13. snydur

    snydur

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    hahah, but seriously, a double brake setup in rear, and a coaster brake with a chain on front.
     
  14. snydur

    snydur

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    well snce i notdealinwith pedals ad cranks

    [​IMG]
    011 by andrew snyder, on Flickr

    [​IMG]
    013 by andrew snyder, on Flickr

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    018 by andrew snyder, on Flickr

    [​IMG]
    020 by andrew snyder, on Flickr

    the knobby tires on the front are goig to go on, and possibly front rims on both sides and just brakes in the back. would have to go over bars at this level. bare metal is looking pretty good from here
     
  15. snydur

    snydur

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    pegs from the cheezy board tracker that never got used. well now they will.
    [​IMG]
    024 by andrew snyder, on Flickr

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    027 by andrew snyder, on Flickr

    drag bars. color will definately be bare metal, and you'll see all the different metals. chrome, steel, zink, i have some brass to :wink:
     
  16. snydur

    snydur

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    [​IMG]
    005 by andrew snyder, on Flickr

    those look waaaaayyyyy better than the piknk ones. imho. i also cleaned up the cuts and got a turtle? yes, a turtle
     
  17. snydur

    snydur

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  18. MiniMe

    MiniMe

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    slow............. ive done 45 on my mountian bike.
     
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  19. KOTA

    KOTA

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    WOW!.With knobby tires? :shock: ..Clocked?
     
  20. snydur

    snydur

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    [​IMG]
    010 by andrew snyder, on Flickr

    hope to get the rest of the paint off tonight. then its time for parts. bolts for plates, wedge for bars, cut seatpost,drill holes for second non pivot bolt, strip paint, sand and paint boards, mount flag. :| wow. and it doesnt even have a chain
     

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