An Unholy Union V: DRZ forks on an Airhead

Discussion in 'Airheads' started by Ras Thurlo, Jun 28, 2014.

  1. Ras Thurlo

    Ras Thurlo Desert Lion

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    Given the recent production run of DRZ triple clamps for airheads by Prutser, its time for a dedicated thread on the topic of DRZ fork airhead conversions.

    There are several historic discussions on DRZ conversions, but not one central thread.


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    #1
    tac650 likes this.
  2. Prutser

    Prutser Long timer

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    Ok :D
    #2
  3. OLD GREEN

    OLD GREEN Long timer

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    Alright, let's see some pictures of those bolted up to some bikes!
    #3
  4. bgoodsoil

    bgoodsoil Dare to be Stupid

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    +1 :lurk

    I wish I had gone with DRZ forks way back when instead of the DRs but I didn't know they were height adjustable at the time.

    What offset did you go with on those triples?
    #4
  5. shearboy2004

    shearboy2004 KIWIINUSA

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    I was looking it this exact idea last light , wanna know all about it ! If I could buy triples and forks as a bolt on I would all over it like a fly on shit !!!
    #5
  6. Phreaky Phil

    Phreaky Phil Long timer

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    Not as many in my collection as Pruster
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    A 320mm Warp 9 rotor :D
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    #6
  7. _cy_

    _cy_ Long timer

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    any chance you could provide link .. can't seem to find it.
    #7
  8. ML WYDELL

    ML WYDELL NED

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    What year DRZ forks are you using?
    #8
  9. Clay Spinner

    Clay Spinner Been here awhile

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    Or should the question be 'what year forks are the best or most suitable for this application'?
    #9
  10. Ras Thurlo

    Ras Thurlo Desert Lion

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    no specific thread (until now)

    #10
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  11. Ras Thurlo

    Ras Thurlo Desert Lion

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    fyi


    #11
  12. Ras Thurlo

    Ras Thurlo Desert Lion

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    exhibit 1:

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    exhibit 2:

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    on a DRZ as mamma nature intended:
    (whole front-end would work well on an airhead)
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    #12
  13. Prutser

    Prutser Long timer

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    There are no pictures yet. The triples came in last friday and we are still waiting for the stems to be finished.
    I wil post some pictures a.s.p.

    The triples have 28mm off-set.
    Shortening those DRZ forks is done in the same way as all the other cartridge forks, by putting a spacer on the cartridge rod on the inside of the cartridge.

    Some pictures of the different DRZ400 forks. These are all 49mm right side up forks. I still don't know on what model DRZ or the years the forks are used on.

    The first fork: with pre-load adjustment.(fork without a cartridge but does have compression adjustment on the bottom)Not the one to use for the best result.
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    The fork with re-bound adjustment on the top cap.(this is the fork to buy)
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    One specially for Jason:wink: RM fork with closed cartridge (very good for your race bike)
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    Picture of the bottom with the compression adjuster (which all the drz
    forks have as far as I know)
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    #13
  14. Prutser

    Prutser Long timer

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    The good thing about those DRZ forks is that they are CHEAP most of the time.
    And they are really good forks. An even better thing is that they fit in our airheads without too much trouble.
    Using the DRZ head bearings and a thick washer and they fit.

    They can also be shortened pretty easy just like most upsd forks by putting a spacer in the cartridge.

    Dmaster(David) and me are often using our airheads for big bike trial riding.
    The stock DRZ triples will give the bike a lot bigger turning circle compared to the stock G/S and GS forks and triples.
    Because the stock DRZ triples have less off-set than the stock BMW triples and the tubes are bigger in diameter they will hit the tank and/or the frame.
    The fork clamp bolts on the bottom DRZ triple are on the rear and are hitting the frame a bit too soon for comfort.
    You can take some material off where the top of the two bolts screws into the plate to make it a bit better but there is still not that much turning space.

    [​IMG]

    To make our bikes better suitable for what we like to do with them we decided to make our own triples that would fit our bikes. The minute I mentioned those triples people started to ask about them. So than we decided to make a few more.

    Thats how the whole thing started :D
    #14
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  15. Prutser

    Prutser Long timer

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    A few things we tried to pay attention to:

    Not to much off-set but just enough to get as much clearance as needed.(28mm)
    Tubes are spaced 10mm wider than the DRZ tubes (200mm)
    clamp bolts on the front side.
    They should work on the G/S and the GS frames.(using different screw in steering stops)
    Holes to mount stock BMW headlight unit are in the triples.
    Stock fender bolts straight on.
    Comes with a Metal stem for BMW head bearing sizes.
    The top nut and adjuster nut are both BMW parts and can still be ordered from BMW if you need them.
    Holes in the bottom triple to take off the bearings.
    10mm thread in the top triple to mount handle bar mounts. Two positions
    Two holes in the top triple to mount a steering damper.
    Holes in the front to mount brake line guides or indicator mounts.
    Wing shaped bottom triple to make sure all the travel in the fork is usable if needed.
    Enough space behind the headlight bucket to route all the cables without the need of spacers between the triple and the headlight bucket.
    #15
  16. Prutser

    Prutser Long timer

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    [​IMG]

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    #16
  17. walkingbear

    walkingbear Lets Play Chicken!

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    do you have a cost for a set?
    #17
  18. shearboy2004

    shearboy2004 KIWIINUSA

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    Bloody beautiful work ! Want ! cash in hand .:deal
    #18
  19. Prutser

    Prutser Long timer

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    They will be 630€ for the set. Including the stem.
    #19
  20. walkingbear

    walkingbear Lets Play Chicken!

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    is that 630 euros?

    630 EUR
    =
    861.83311 USD
    #20