Year of the Race Bike

Discussion in 'Airheads' started by Stagehand, Nov 2, 2013.

  1. hardwaregrrl

    hardwaregrrl ignore list

    Joined:
    Jan 26, 2006
    Oddometer:
    8,142
    Location:
    Atlanta
    I call BULLSHIT....on this one. I know, I know....I've not really seen you race as I'm always behind you, but you got a big sack my friend. Dreaming about a small ride for Sandblast....but it ain't gonna happen. 41 year old chick racing a 460# bike is out of my trajectory I'm afriad. Anything I can do down here on my end, lemme know. You know I can stop drop and roll in a pile of airhead parts in mere hours. Machine shop, engine shop and blacksmith shop within reach. I still owe you a pair of "shit heads", just haven't gotten to them yet. I'm on it. I most certainly will enjoy watching you move forward racing any airhead. It's fucking rad! No I am not smoking dope, hung out with a 19 year old kid from China last few days. He seems to have affected me:dunno
    #21
  2. russbryant

    russbryant Long timer

    Joined:
    Dec 12, 2003
    Oddometer:
    1,210
    Location:
    Tucson, AZ
    Let's see...Jason build's a dedicated airhead rallye race bike. Yep, I'm in. :clap:clap

    Woot Woot!!


    Russ
    Tucson
    #22
  3. ME 109

    ME 109 Long timer

    Joined:
    Jun 25, 2009
    Oddometer:
    4,793
    Location:
    Albury Australia
    R100RS with a 21" front wheel?

    :fpalm
    #23
  4. fallingoff

    fallingoff Banned

    Joined:
    Jun 11, 2011
    Oddometer:
    3,677
    Location:
    syd oz
    Great post
    Your got a mind,heart of a 20 year old .
    Got me laughing
    Thks
    Good luck with it Jason.
    Cheers
    #24
  5. EvilClown

    EvilClown Reality show stunt double Super Moderator

    Joined:
    Sep 3, 2006
    Oddometer:
    17,305
    Location:
    In the shadow of the Uncanoonucs...
    :thumb


    :lurk
    #25
  6. Renner

    Renner combustophile

    Joined:
    Jul 11, 2007
    Oddometer:
    2,760
    Location:
    sunny SoCal
    it's great seeing what a box'r of hammers can do :D

    :nod :thumb

    :lurk
    #26
  7. LoJack

    LoJack Long timer

    Joined:
    Apr 4, 2008
    Oddometer:
    1,622
    Location:
    B.G., yo!
    I'm curious about the Rooney frames. I'd imagine there is a big difference in flex/stiffness over your PD or B'o'H? Is there a weight savings?

    I'd love to see some pics of just the frame or engine in frame to see how it's mounted clearly.

    I'm still planning on making a trail bike out of my /5 sometime. Been collecting parts and I'm about done working on the jig design for my swing arm project so I can make this:

    [​IMG]

    Just need to find a shop to help machine the jig.:evil I'm hoping to have the swing arm bolted on by spring.
    #27
  8. Padmei

    Padmei enamoured

    Joined:
    Mar 12, 2008
    Oddometer:
    4,099
    Location:
    Nelson New Zealand
    Go for a chain conversion. heaps more options for travel & weight savings
    #28
  9. Stagehand

    Stagehand Imperfectionist

    Joined:
    Oct 6, 2004
    Oddometer:
    31,497
    Location:
    Shawangunks
    I guess I imagine there to be at least the same stiffness, if not more. I imagine it to be about as rigid a section as you could get between the steering neck and swingarm. I cant speak for weight. I can only guess its close, or lighter. Paul wouldnt bother building something worse off than where he started.
    Main plusses to me are the ability to put on whatever steering neck you like, ahead of time, if you can decide on a fork you want to use. I'm pretty sure Its not a striaght up BMW one.
    Then there is the 1100 swingarm is a bolt-on. I dont know if it is with the BMW frame, but I dont believe there are offset issues with this one. HE didnt mention to me about offsetting the wheel, so I guess he using a paralever drum diff.
    The air intake is Super high! I love it!
    He did mention that engine access was really nice for working on.. although just now lookign at it it looks like the transmission might be a little hard to swap out.

    I like your swingarm. WHat do you think the shock mounts will look like?
    #29
  10. Stagehand

    Stagehand Imperfectionist

    Joined:
    Oct 6, 2004
    Oddometer:
    31,497
    Location:
    Shawangunks
    options, kinda! weight savings? Not from the ones I've seen :D
    #30
  11. Stagehand

    Stagehand Imperfectionist

    Joined:
    Oct 6, 2004
    Oddometer:
    31,497
    Location:
    Shawangunks
    YOU owe me nothing but at least one more shot at the RR. I might have to loan you the 450 for the CRC, as well :D
    #31
  12. LoJack

    LoJack Long timer

    Joined:
    Apr 4, 2008
    Oddometer:
    1,622
    Location:
    B.G., yo!
    With a typical transmission swap, you pull the rear end off first, correct? With his maybe you pull the engine? Seems like it would be easy enough.

    It's a steel frame?

    I don't know what the shock mount is going to be like yet. I'm thinking sort of central like the oilhead GS's right now but I don't know if the swing arm is stiff enough for that if I don't reinforce it. Still need to get into FEA, but sometimes school needs to take a back seat to a good bike tour:D. Maybe like the old ISDT HPN bike, which is an obvious inspiration. I have an Xchallenge air shock to start out with (it's HUGE!), then will try and find an aftermarket Xc shock once I know what sort of spring rates I'm working with. Right now the swing arm weighs in at 9.35 pounds.:deal
    #32
  13. Stagehand

    Stagehand Imperfectionist

    Joined:
    Oct 6, 2004
    Oddometer:
    31,497
    Location:
    Shawangunks
    Its steel, yes, and chromoly for a good bit, I believe.

    Seems like you pull the engine forward. Hangers, battery, starter and coil wiring, then aribox stuff and then driveshaft. Kind of a drag, but if thats the worst.. it may be hearsay, but he says the hting turns and handles better than the loop frame I rode. So Thats another plus.

    THe swingarm would probably be stiff enough if you spread the load of the mount out over enough of it :D
    #33
  14. Beater

    Beater The Bavarian Butcher

    Joined:
    Sep 3, 2009
    Oddometer:
    3,701
    Location:
    Atlanta, GA, USA
    This is going to be EPIC. Can you feel it?

    PS - You've read Stephen Bottcher's fab of a monolever rear hub from a GS hub ... right? Now you can put spokes on the rear, and if you can find the Akront 18" rim ....

    :amazon





    :lurk
    #34
  15. Ras Thurlo

    Ras Thurlo Desert Lion

    Joined:
    Aug 5, 2010
    Oddometer:
    771
    Location:
    Hillcountry, Italy
    but is the 1100 swing arm vulnerable to breaking when ridden as a dirtbike?

    I understood that the HPN variant was done to deal with this, as am not sure there is that much weight saved

    Manuel at SWT seems to ride his pretty hard, so may be wrong


    which final drive you thinking of using, 80/100 or 1100?

    I would guess that has a knock-on effect on the wheel offset for a 140 tyre
    #35
  16. Airhead Wrangler

    Airhead Wrangler Long timer

    Joined:
    Mar 4, 2008
    Oddometer:
    6,823
    Location:
    Back in Seattle, FINALLY
    <iframe width="1280" height="720" src="//www.youtube.com/embed/PfYU-sN_MGk" frameborder="0" allowfullscreen></iframe>

    Considering what it is, that thing handles a trials course pretty well. It also spits fire. Nothing wrong with that. :evil

    <iframe width="960" height="720" src="//www.youtube.com/embed/VTOCDykQFxE" frameborder="0" allowfullscreen></iframe>
    #36
  17. Stagehand

    Stagehand Imperfectionist

    Joined:
    Oct 6, 2004
    Oddometer:
    31,497
    Location:
    Shawangunks
    Gosh I hope its not brittle, in that regard :uhoh I assume it will take some solid hits, but I'm counting on the suspension to soften the blows :D

    I guess there may not be a weight savings, but its the good length out of the box, so I think the R100 FD? Its the 3.09, which is ok, I think. It will still go plenty fast :D Which one is lighter?
    #37
  18. Airhead Wrangler

    Airhead Wrangler Long timer

    Joined:
    Mar 4, 2008
    Oddometer:
    6,823
    Location:
    Back in Seattle, FINALLY
    for a couple more final drive options, if you want lower gearing you can get the R80GS (no /) final drive 3.20:1 or the R850GS (same ratio) if you want a disc rear brake.
    #38
  19. Ras Thurlo

    Ras Thurlo Desert Lion

    Joined:
    Aug 5, 2010
    Oddometer:
    771
    Location:
    Hillcountry, Italy
    thats the 32/10 right?

    i thinks thats a great ratio for the sort ground Stagehand wants to ride this bike on
    #39
  20. Cogswell

    Cogswell Spudly Adventurer

    Joined:
    Jan 3, 2005
    Oddometer:
    5,950
    Location:
    Riding with my pal Richard Cranium
    Sounds like an interesting build, count me in !

    Maybe I'll even pick up some tips for my ST...

    :1drink


    Mike
    #40