Advertise on Bikeforums.net



User Tag List

Page 1 of 2 12 LastLast
Results 1 to 25 of 29

Thread: whoa. bars.

  1. #1
    Cornucopia of Awesomeness baxtefer's Avatar
    Join Date
    Oct 2004
    Location
    not where i used to be
    Posts
    4,847
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    whoa. bars.

    i know this bike belongs to someone here - It's the jonny with the perforated top tube.
    but what bars are these?
    that's some serious drop.
    Attached Images Attached Images
    {o,o**
    |)__)
    -"-"-

    O RLY?

  2. #2
    blah onetwentyeight's Avatar
    Join Date
    Oct 2005
    Location
    Oakland, CA
    Posts
    5,573
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    guessing: soma bonzo bars?

  3. #3
    Seen your member! Slodo's Avatar
    Join Date
    May 2005
    Location
    (bike thief city) Chicago
    My Bikes
    A black one
    Posts
    163
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    So awesome! Gotta be a custom job; I've never seen anything like that.
    In large states public education will always be mediocre, for the same reason that in large kitchens the cooking is usually bad. -F W N

  4. #4
    Senior Member
    Join Date
    Jun 2005
    Location
    Chicago
    Posts
    349
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    At that point I'd just go for the bullhorns off the front fork. I can't remember the guy who had them, but I think it was a Russian olympian.

  5. #5
    make way for the MGL MLPROJECT's Avatar
    Join Date
    May 2005
    Location
    NEW YORK
    My Bikes
    khs aero track
    Posts
    1,927
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    rebent b123s? metal fab dudes can do whatever they want if they know their tools

  6. #6
    blacksheep the blemish
    Join Date
    Nov 2004
    Location
    Portland/Greendale
    My Bikes
    1973 Schwinn World Voyageur (manufactured by panasonic), Italvega Super Speciale (fixed, primary ride now), Kona 2004 JTS 10 spd
    Posts
    1,063
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Can we start a betting pool for how many miles it's gonna be before the frame cracks at those holes?

  7. #7
    nothing interesting here. chuck_norris's Avatar
    Join Date
    Jan 2006
    Location
    North Cambridge
    My Bikes
    villin, trek beater.
    Posts
    267
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by MLPROJECT
    rebent b123s? metal fab dudes can do whatever they want if they know their tools
    I agree that metal guys can are capable of crazy ****, but that's no nitto bar. It doesent have the cuff in the middle. I think that the guy that bent that just used a mandrel pipe bender. Used frequently for bending the exhaust pipes on cars. I'd imagine that those are pretty flexy considering the elasticity needed for that kind of bend. I could be wrong though.
    FS or trade: 56cm Schwinn tange prestige Prologue TT frameset and front wheel. $225 obo.

  8. #8
    make way for the MGL MLPROJECT's Avatar
    Join Date
    May 2005
    Location
    NEW YORK
    My Bikes
    khs aero track
    Posts
    1,927
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    i mean, that's johnny in the pic... where's he at to answer this one?

  9. #9
    Throbbing Member
    Join Date
    Mar 2006
    Location
    trout fishing in america
    My Bikes
    many
    Posts
    729
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Jonny told me that they are actually old-timey track bars that he's been saving for just such a bike. Freaky-deaky.

  10. #10
    nothing interesting here. chuck_norris's Avatar
    Join Date
    Jan 2006
    Location
    North Cambridge
    My Bikes
    villin, trek beater.
    Posts
    267
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by endform
    Can we start a betting pool for how many miles it's gonna be before the frame cracks at those holes?
    Cracks have a lot of trouble propogating from round cutouts. That's basic mechanics of materials talking.... basically why windows on planes don't have corners. I don't know the steel used, but I'm pretty sure there isn't much of an issue.

    At least with steel you'd see the crack grow before failure. Had it been made from aluminum...
    FS or trade: 56cm Schwinn tange prestige Prologue TT frameset and front wheel. $225 obo.

  11. #11
    Senior Member mattface's Avatar
    Join Date
    Sep 2005
    Location
    Montpeculiar, VT
    My Bikes
    Soma Rush, Fuji Cross, Raleigh Technium Mtn Bike, Ross 10 speed with Shimano 600.
    Posts
    3,951
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    this should end the speculation.
    That's Jasonsan's bike
    Baby Blue cotton tape and handlebar pics inside!

  12. #12
    blacksheep the blemish
    Join Date
    Nov 2004
    Location
    Portland/Greendale
    My Bikes
    1973 Schwinn World Voyageur (manufactured by panasonic), Italvega Super Speciale (fixed, primary ride now), Kona 2004 JTS 10 spd
    Posts
    1,063
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by chuck_norris
    Cracks have a lot of trouble propogating from round cutouts. That's basic mechanics of materials talking.... basically why windows on planes don't have corners. I don't know the steel used, but I'm pretty sure there isn't much of an issue.

    At least with steel you'd see the crack grow before failure. Had it been made from aluminum...
    But those cutouts are very large compared to the diameter of the tube, does that affect anything?

  13. #13
    nothing interesting here. chuck_norris's Avatar
    Join Date
    Jan 2006
    Location
    North Cambridge
    My Bikes
    villin, trek beater.
    Posts
    267
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    the radius of the cutout is inversely proportional to the likelyhood of crack initiation. In simpler terms: A bigger round cutout is less likely to have a crack start around it.

    In fact the reason that most frames have that circular hole at the bottom of the seam where the seat tube cluster binds the seat post, is exactly this principle.
    FS or trade: 56cm Schwinn tange prestige Prologue TT frameset and front wheel. $225 obo.

  14. #14
    nothing interesting here. chuck_norris's Avatar
    Join Date
    Jan 2006
    Location
    North Cambridge
    My Bikes
    villin, trek beater.
    Posts
    267
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I may have misread you're question. I think you're wondering about the structural integrity in general. Such as a buckling of the tube at that hole?

    From what I know about frames, the downtube undergoes the most stress in ordinary riding conditions (we aren't talking about what will happen to the frame in a wreck). Obviously the less material present, the larger the cutout, the more stress will concentrate on the rest of the material. The fact that the holes are drilled dorsally is definitely good thinking from a srtuctural standpoint. And from an innovative standpoint, because from my recollection Jsonsasn has the largest hole drilled the same diameter as his lock, that just plain neat.
    FS or trade: 56cm Schwinn tange prestige Prologue TT frameset and front wheel. $225 obo.

  15. #15
    i am sure that i hate you spud's Avatar
    Join Date
    Aug 2005
    Location
    703
    My Bikes
    'Cha-ruzu Fosuta Orusan Kein' Fuji Track (2005), Schwinn Tank MTB (?), Fuji Royale (1979)
    Posts
    3,230
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    that headtube is like 5x the size of #28
    putting the pi back in pirate!
    Itís an upstanding member of the solar system
    Apply the laws of earth and make it a victim
    Of Proposition 187

  16. #16
    Senior Member Nachoman's Avatar
    Join Date
    May 2005
    Location
    Point Loma, CA
    My Bikes
    Bill Holland (Road-Ti), Bike Friday (folder), Co-Motion (tandem) & Trek 750 (hybrid)
    Posts
    12,983
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Not my style. I like a more relaxed position. I get enough stress at work.
    .
    .

    Two wheels good. Four wheels bad.

  17. #17
    Senior Member concernicus's Avatar
    Join Date
    Jan 2006
    Location
    Santa Cruz
    My Bikes
    doesnt matter. just ride.
    Posts
    425
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    jonny told me he got em of ebay. they were rusted so he cleaned em up and painted em. now they look snazzy.

  18. #18
    Member biketolive's Avatar
    Join Date
    Feb 2006
    Location
    TBay, Ontario
    My Bikes
    Klein Attitude
    Posts
    26
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Hi
    As I can tell you know some stuff about simple mechanics of materials but as I am sure you also know that just because you can't see any cracks forming doesn't mean that there is not yeilding occuring. In fact in most materials (exculding hardened materials which follow simple plastic deformation curve) will yeild to a great extent before catastrophic failure (complete failure meaning Er > Eu). If there is such stated holes there will be less deformation before ultimate failure. That being said if failure is do to a positive moment in the x direction there will be little differnce because of the small reduction in the I value due to the holes being on the nuetral axis. I hope that clear's up some of the points stated by some of the other members. Jay
    Ride It Like It Was Stolen

  19. #19
    Member biketolive's Avatar
    Join Date
    Feb 2006
    Location
    TBay, Ontario
    My Bikes
    Klein Attitude
    Posts
    26
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    sorry to get off topic but Chuck I agree with you, but could you tell me why they put the holes in that specific spot. Klein also claims that it reduces stress which I can't see why because if it is in tension/compression there is a reduction in cross sectional area which increases stress. thanks jay
    Ride It Like It Was Stolen

  20. #20
    Senior Member jasonsan's Avatar
    Join Date
    Nov 2004
    Location
    Milwaukee Wisconsin
    My Bikes
    Surly LHT, Surly Steamroller, Jonnycycles Track, 80's Schwiinn Voyager SA 3 speed conversion/fixed, Schwinn Voyager SA 3 speed conversion standard. 1973 Schwinn Twinn Deluxe
    Posts
    345
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I got those bars from Ebay, that guy in Australia who often has vintage track stuff.Jonny brazed a new S/S center section on 'em, and capped the ends for me as well. They are not very functional...I think they are for a little kid with ape arms. Narrow and deep.......but I was going for style.

    As far as the holes in the top tube go, I was inspired by the strawberry integrated seatpost clamp....... this .They aren't just open holes.There are s/s tube inserts thru my toptube. I originally asked him to put them in the downtube, but he said he wouldn't be comfortable with that. Will it hold up? Probably, but you never know unless you try, right? Again, this was done simply cuz I thought it'd look cool, not for any other reason.The u-lock thing was a nice coincidence.
    Interesting that the topic of durability came up here, and not at the show, or on the framebuilder forum ( where we were expecting some debate). You guys are on point!

  21. #21
    Senior Member
    Join Date
    Dec 2004
    Location
    St Paul, MN
    Posts
    697
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I think the s/s sleeves will brace the walls of the tube at the holes. The top tube is primarily in compression, with some torsional forces. I would expect that the tube would fail in buckling at mid-length prior to the onset of yielding near the steer tube. I don't know what role fatigue will play in all this. Anyway, just my 2 cents.

  22. #22
    Eat. Lift. Ride. Drink. Sinfield's Avatar
    Join Date
    May 2005
    Location
    pdx
    Posts
    572
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I'd imagine that with the round inserts in there, you would be golden. I notched the framerails on my old GTI and welded a piece of pipe in the cutout so that I could slam the car and not rub the axels and I never had any issues. Sort of the same theory, round (or half round) cutout in what is essentially a hollow tube (toptube/ framerail), braced with welded pipe. I'd guess that there was a lot more stress on the car than the top tube of a bike.

  23. #23
    Cornucopia of Awesomeness baxtefer's Avatar
    Join Date
    Oct 2004
    Location
    not where i used to be
    Posts
    4,847
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    yeah it sould be fine with the SS inserts

    it kinda reminds me of that bike with the hollowed out chainstays. Was that a 3Rensho, or a Nagasawa?

    edit/ 3Rensho
    {o,o**
    |)__)
    -"-"-

    O RLY?

  24. #24
    Senior Member
    Join Date
    Dec 2004
    Location
    St Paul, MN
    Posts
    697
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I hope those chainstays have weep holes along the bottom. Yikes!

  25. #25
    PatronSaintOfDiscBrakes dynaryder's Avatar
    Join Date
    Apr 2005
    Location
    dropped and lost in Washington DC
    Posts
    6,248
    Mentioned
    12 Post(s)
    Tagged
    0 Thread(s)
    Those look kinda like what they used to run on vintage racing motorcycles.

    Which basically were just bicycles with engines.


    C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport/Qualifier,Dahon Speed Pro TT,Brompton S6L

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •