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  1. #1
    Senior Member BengeBoy's Avatar
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    Why, yes, I *am* a mechanical genius....

    As I grow ever-more fond of my vintage Univega touring/commuting bike, I decided it was time to jettison the oh-so-funky oblong Biopace chainrings and do some other maintenance upgrades as well.

    I bought a new crankarm puller, and Friday night/Saturday morning I:


    - took off the crankarm, installed the 3 new chainrings, re-installed the crank arm
    - replaced the chain
    - tuned up the derailleurs
    - fixed a couple of loose screws on a fender
    - checked the tire pressure and aired up the tires.

    I then took off for a test ride, only to quickly discover that it didn't feel "quite right."

    Once I took a look at the bike, and discovered my bone-headed mistake, I decided to grab a camera to document my achievement:


    Last edited by BengeBoy; 09-21-08 at 10:18 PM.

  2. #2
    Junior WHAT?!?! molarface's Avatar
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    I like the look! Harley-Davidson has been using it for years with great success.

    Don

  3. #3
    rebmeM roineS JanMM's Avatar
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    Sheer genius!

  4. #4
    just keep riding BluesDawg's Avatar
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    The more you ride your bike, the less your ass will hurt.

  5. #5
    Small Member maddmaxx's Avatar
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    Great for a lower center of gravity. Your friends will think you slightly eccentric however.
    Just take it

  6. #6
    Senior Member Red Baron's Avatar
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    I like It!
    **Fate is a fickle thing, and in the end the true measure of a person is not fate itself, but how they master it**

  7. #7
    Senior Member BlazingPedals's Avatar
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    Gets rid of the dead spot on the top of the pedal stroke. Now, if you could just figure out something for getting rid of the dead spot at the bottom of the stroke you'd be all set.

  8. #8
    Squirrel solveg's Avatar
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    Make sure you store those biopace away nicely. Or sell them on ebay. They're tre-desirable.

  9. #9
    Senior Member
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    Gonna have to limit the beer intake the next time you wrench on your bike!

  10. #10
    Senior Member Retro Grouch's Avatar
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    I've seen that done before. Not by me of course, but some of the other guys.

  11. #11
    Wheezing Geezer Bud Bent's Avatar
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    Wow, that's even more radical than the Biopace chainrings.
    Bud
    * 2009 RANS XStream
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    My Blog - uneasy-rider.com

    They told me it's ok to post mileage over in the commuting forum, so you'll probably find me there these days.

  12. #12
    Time for a change. stapfam's Avatar
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    Now if you were clipless- You could pedal in 3/4 circles.
    How long was I in the army? Five foot seven.


    Spike Milligan

  13. #13
    Senior Member
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    Another happy graduate of the Three Stooges Cycling Academy. Woop! Woop! Nyuk Nyuk

  14. #14
    Senior Member SaiKaiTai's Avatar
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    BRILLiant!
    '13 Felt Z3 - '08 Jamis Aurora Elite - ('07 Giant OCR C2)

  15. #15
    The Improbable Bulk Little Darwin's Avatar
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    I sure wish I could see the images from work... I'll assume you did something like I would do until I see the pic.
    Slow Ride Cyclists of NEPA

    People do not seem to realize that their opinion of the world is also a confession of character.
    - Ralph Waldo Emerson

  16. #16
    VoodooChile zoste's Avatar
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    Quote Originally Posted by molarface View Post
    I like the look! Harley-Davidson has been using it for years with great success.

    Don
    That was my first thought as well
    Sometimes nothing can be a real cool hand

  17. #17
    Scott n4zou's Avatar
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    Quote Originally Posted by molarface View Post
    I like the look! Harley-Davidson has been using it for years with great success.

    Don
    Yes, both cylinders hitting on the same stroke. Marvelous engineering.
    [SIGPIC]http://www.bikeforums.net/image.php?type=sigpic&userid=57360&dateline=1197386754[/SIGPIC]
    It's easier to pick a Yankee tourist than a bail of cotton.

  18. #18
    feros ferio John E's Avatar
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    This reminds me of the debate on tandems -- should captain and stoker be in phase, per convention, or 90 degrees out of phase, to operate like a 4-cylinder engine?
    "Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
    Capo [dschaw'-poe]: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger, S/N 42624
    Peugeot: 1970 UO-8, S/N 0010468
    Bianchi: 1981 Campione d'Italia, S/N 1.M9914
    Schwinn: 1988 Project KOM-10, S/N F804069

  19. #19
    Senior Member Terrierman's Avatar
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    In the immortal words of my former Drill Instructor. "Lovely. Simply ****ing lovely."
    It's all downhill from here. Except the parts that are uphill.

  20. #20
    Ol' Paint
    Join Date
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    Been there.
    "In my cathedral,
    colored glass holds no candle to
    sunlight through trees."
    -- Leon Briggs

  21. #21
    Time for a change. stapfam's Avatar
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    Quote Originally Posted by John E View Post
    This reminds me of the debate on tandems -- should captain and stoker be in phase, per convention, or 90 degrees out of phase, to operate like a 4-cylinder engine?
    And the debate goes on.We tried it and it did not work for us but if we wanted "Extra" speed- Pilot and stoker worked with one pushing down on the pedals and one pulling up. Had to switch over about every minute or so but for the Extra turn of speed for 5 minutes or so, it did work.
    How long was I in the army? Five foot seven.


    Spike Milligan

  22. #22
    Senior Member Retro Grouch's Avatar
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    Cool idea but you need a different bicycle to pull it off.

    See if you can find one of those vintage Roy Rogers bikes and set the cranks up that way. It'll give you the feeling of a galloping horse the way that we used to do when we were kids.

  23. #23
    aka Phil Jungels Wanderer's Avatar
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    Sure makes it easier to stand up on while coasting!

  24. #24
    His Brain is Gone! Tom Bombadil's Avatar
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    If I posted a picture here of every fix-it job that I screwed up, it would make for a large photo album. I get so tired of it. I can almost always get it right eventually, but I'm just not attentive enough. I can see myself doing exactly what you did.

    I wish I could say that looking at your pic makes me feel better ... but it doesn't. But it did make me laugh.
    "Too often I would hear men boast of the miles covered that day, rarely of what they had seen." Louis L'Amour

    There are two types of road bikers: bikers who are faster than me, and me. Bruce Cameron - Denver Post

  25. #25
    Lincoln, CA Mojo Slim's Avatar
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    I think for that set up to work, both pedals have to be on the same side of the bike.
    Truth is stranger than reality.
    '96 Giant ATX 760 MTB
    '01 Bianchi Eros
    '05 Giant OCR Llimited Carbon Fiber + upgrades

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