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

    Joined:
    Aug 5, 2010
    Oddometer:
    882
    Location:
    Hillcountry, Italy
    :D

    best thing is that you don't get used to it
  2. Screaming Chicken

    Screaming Chicken Long timer

    Joined:
    Nov 29, 2007
    Oddometer:
    1,520
    Location:
    Netherlands
    Full lock with everything on. It's like the PD tank was made for these forks... :lol3
    [​IMG]

    I did notice that with the new bars it's somehow more prone to tooting its own horn... :lol3

    Some more pics of the finished product:
    [​IMG]
    [​IMG]
    [​IMG]

    Yeah. Happy with it. :-)
  3. Beater

    Beater The Bavarian Butcher

    Joined:
    Sep 3, 2009
    Oddometer:
    3,708
    Location:
    Atlanta, GA, USA
    Is that Prutzer's triple?
  4. Screaming Chicken

    Screaming Chicken Long timer

    Joined:
    Nov 29, 2007
    Oddometer:
    1,520
    Location:
    Netherlands
    Yes, though they've been somewhat modified for clearance.
    mysticerror likes this.
  5. Screaming Chicken

    Screaming Chicken Long timer

    Joined:
    Nov 29, 2007
    Oddometer:
    1,520
    Location:
    Netherlands
    For the record, the stock (2x 27mm Nissin) DRZ caliper works acceptably well with the 13mm GS MC. It's not great, a bit wooden (compared to the 4-pot Brembo I had), but it works well enough that I might just leave it alone if I can't easily find a way to improve it.

    So, just checking against the odds:

    That DRZ caliper looks awfully familiar, at least every other Honda seems to use the same one by the looks of it. (Transalp, etc.) I know some of the older Hondas had slightly different Nissin calipers with bigger pistons, IIRC the Dommie and some early TAs and ATs were 2x 30mm.

    There isn't by any chance a caliper out there with slightly bigger pistons that'll slip straight onto the DRZ bracket, is there? :lol3
  6. Jim K in PA

    Jim K in PA Long timer Supporter

    Joined:
    Mar 15, 2011
    Oddometer:
    5,049
    Location:
    Pocono Mountains, PA
    There is a 12mm BMW master you could swap to. Not a huge difference, but maybe enough??
  7. Screaming Chicken

    Screaming Chicken Long timer

    Joined:
    Nov 29, 2007
    Oddometer:
    1,520
    Location:
    Netherlands
    The 12 would be nice indeed, but is not a bolt on option for the K controls on the later model GS, that's 13mm minimum.

    Converting to older-style controls seems like a whole lot of work so I'd rather leave those be. Besides, I like the K controls. :-)

    Other options are to sleeve the MC to 12mm (the Phreaky Phil option :-) ) or to get into bracketry with a different caliper altogether but that doesn't rate as easy anymore so if it comes to that I think I'll leave it as is.

    Unless it does annoy me later, obviously. :lol3
  8. PaulRS

    PaulRS Dutch fool

    Joined:
    Apr 15, 2008
    Oddometer:
    1,599
    Location:
    Holland, land of tulips and wooden shoes
    I was in the same boat.
    Started with the oem DRZ brake, 250 mm disk and 27-27 Nissin, that may be good enough to stop a 130 kgs DRZ, but no good for a 200 kgs BMW.
    I then got a few 30-30 calipers from a TA and an old VFR, thanks to the Dutch GS-forum, no joy, they don't fit.

    Ended up with a disk from a K/R1100RS/RT, 305 mm, which is suprisingly a straight fit to the DRZ hub*, and a caliper from a F650GS, 30-32 mm, a homemade bracket, braided line and the oem 13 mm pump.
    It still is a bit wooden, but very powerfull.

    *The disk used here requires 8 mm bolts and the DRZ hub only accepts 6 mm bolts, so to make it fit I countersunk the holes in the disk carrier and used countersunk M6 bolts.
    Not the best option in my engineering point of view, but the DRZ hub has little meat to be opened up to M8, and for shouldered bolts there is no room between the bolt heads and the fork leg.
    But after a few Kkm of hard use there are no issues with those bolts used, so I tend to keep it this way.

    Paul.
  9. Screaming Chicken

    Screaming Chicken Long timer

    Joined:
    Nov 29, 2007
    Oddometer:
    1,520
    Location:
    Netherlands
    I really wouldn't want to stop a fully loaded PD with the DRZ 250mm disc... The 320 disc does help a bit there. It's clearly not as powerful as the 320 disc with the 1100 Brembo caliper, that was proper brakes. But it's acceptable, certainly better than the stock GS brake.

    Pity.

    Most of the older 30-30 Nissins have a different slider pin arrangement, they're visually different, the lower slider pin is too far down. I have some hope for the '89 TA caliper, which at least visually looks compatible. I'll have a look at the local wreckers sometime.

    Then again, should I even WANT a vintage Nissin caliper? The one on the dommie was a complete disaster... :lol3
  10. tututis

    tututis Adventurer

    Joined:
    Aug 9, 2004
    Oddometer:
    87
    I'm working on my project and I would know something more about this bike, namely about the windscreen. I have a R80ST and I want to keep his face with a similar of bike's photo.
    It seems a GIVI windscreen...

    [​IMG]
    bleaknessengine and naginalf like this.
  11. tututis

    tututis Adventurer

    Joined:
    Aug 9, 2004
    Oddometer:
    87
    these are my triples

    [​IMG]
  12. Area545

    Area545 Adventurer

    Joined:
    Oct 8, 2014
    Oddometer:
    51
    Location:
    Netherlands
    Hey Tututis,

    The windshield I used is a PUIG.

    http://www.puigusa.com/tuning-bikes/windshield-naked/c171en/f199-r20/


    IMG_0091.jpg

    Cheers,
    Michael
  13. Screaming Chicken

    Screaming Chicken Long timer

    Joined:
    Nov 29, 2007
    Oddometer:
    1,520
    Location:
    Netherlands
    That is a tasty looking bike... :-)
  14. Area545

    Area545 Adventurer

    Joined:
    Oct 8, 2014
    Oddometer:
    51
    Location:
    Netherlands
    Thnx. Very very happy with it. Triples and DRZ fork work great.
    Prutser and Dmaster :thumb
  15. Prutser

    Prutser Long timer

    Joined:
    Aug 5, 2012
    Oddometer:
    2,073
    Location:
    The Dutch swamp
    We both love your bike too :-)

    It might need a new mastercilinder if I remember correctly :D
  16. Area545

    Area545 Adventurer

    Joined:
    Oct 8, 2014
    Oddometer:
    51
    Location:
    Netherlands
    Is it collecting dust ? :lol3 I'll be around soon for a friday takeout wrench night :dukegirl
  17. Hogberg

    Hogberg Adventurer

    Joined:
    Jun 16, 2012
    Oddometer:
    21
    Location:
    Sweden
    Thanks all of you for the inspiration and knowledge that is shared in here!
    After some lurking i started with my project and this is what my R80/7 looks like with an drz front end.

    [​IMG]

    Front fork is shortened 70 mm and the rear shocks are 30 mm longer than the stock ones.
    The bike handles nice and is very fun to ride.
    [​IMG][/URL][/IMG] [​IMG][/URL][/IMG]
    Anders
  18. Prutser

    Prutser Long timer

    Joined:
    Aug 5, 2012
    Oddometer:
    2,073
    Location:
    The Dutch swamp
    It is but still at the dealer. :shog
  19. tututis

    tututis Adventurer

    Joined:
    Aug 9, 2004
    Oddometer:
    87
  20. Screaming Chicken

    Screaming Chicken Long timer

    Joined:
    Nov 29, 2007
    Oddometer:
    1,520
    Location:
    Netherlands
    Well, shit.

    [​IMG]

    On the plus side, the forks actually still look straight, and nothing's going to hurt those triples it seems. The frame, however...