Gotta question about wheels

Discussion in 'Airheads' started by R-dubb, Apr 26, 2013.

  1. R-dubb

    R-dubb Dubbious Adventurer

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    I'm trying to marry a snowflake wheel and a new style fork with 25mm axle.

    Is it possible? I can have an axle and/or spacers machined. But fitting a 25mm axle through an 17mm hole is a different kind of trick.
    #1
  2. Airhead Wrangler

    Airhead Wrangler Long timer

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    What's the OD of the wheel bearing? See if you can find a different wheel bearing with the same OD and 25mm ID.
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  3. R-dubb

    R-dubb Dubbious Adventurer

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  4. R-dubb

    R-dubb Dubbious Adventurer

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    Looks like I'm barking up a tree.

    Closest size in a sealed ball bearing is 25x42x9.
    Roller bearing (non-tapered) is 25x42x17.

    Also mentioned is difficulty matching up rotors, but I do have some K bike rotors milling about. Bigger is better, if I can get the alignment worked out. Maybe more work than it's worth.
    #4
  5. bmwrench

    bmwrench Long timer

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    Make up a sleeve.
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  6. Prutser

    Prutser Long timer

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    Something like this :

    [​IMG]
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  7. Houseoffubar

    Houseoffubar HoFmetalworks.com

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    Edray, here on the site did this on his R100S. He used late model inverted GSXR forks, and brakes on his snowflake wheels. This required using the original dia. axle, then machined spacers that fit the forks. Then spacer discs for the rotors, to make for proper spacing. He also re drilled the rotor hole spacing.
    This last step can be avoided, by using Ducati, or Yamaha FZR rotors (not sure what years, etc).
    #7
  8. Houseoffubar

    Houseoffubar HoFmetalworks.com

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  9. R-dubb

    R-dubb Dubbious Adventurer

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    What a great thread! You do some fine work.

    Yes, the snowflakes look great in black. Those caliper brackets look good too. I'm still moving in about four directions at the same time. Thanks for the tips.
    #9
  10. Ras Thurlo

    Ras Thurlo Desert Lion

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    +1
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  11. mendoje

    mendoje Been here awhile

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    They look so good, when I first opened that thread, I thought they were spoked wheels. Very nice!
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  12. Boxer Metal

    Boxer Metal Mad Scientist

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    Yes this is possible. I did this to Andy Goldfine of Aerostich's R80G/S just before he and Helge Petersen did their China and Russia trip many years ago.
    The parts I started with were a R100GS front end and the R80G/S wheel. These both have the same axle and wheel bearings as your application. You need to machine a spacer for the fork legs and for the axle and if I remember correctly it was easier to use a rear axle from any drum brake post 1970 model as they are a little bit longer than the 1975-84 17mm front axles.
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  13. mendoje

    mendoje Been here awhile

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    Perfect timing, I'm thinking about doing this! Is the spacer in the fork split, so that the fork can clamp on the axle?

    Thanks!
    Jeff
    #13
  14. Boxer Metal

    Boxer Metal Mad Scientist

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    It couldn't hurt.You could also add a step to it so it stays in place.
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  15. mendoje

    mendoje Been here awhile

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    Perfect! Dont want to hijack this thread, so PM sent on one last question regarding R80G/S wheel + R100GS forks.
    Thanks! Jeff
    #15
  16. Boxer Metal

    Boxer Metal Mad Scientist

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    Someone asked me this question off of this thread and I thought it would be good information for everyone.

    Will the G/S brake caliper bolt right on to GS forks, and if yes, will they line up with the G/S rotor? Or will I have to fab a caliper adapter bracket?

    Answer:
    We are pushing my memory here. I did this conversion about 15 years ago. We used the GS disc, re-drilled it for the 5 bolt pattern and I think I made a spacer to bring it out further. In drilling the rotor one of the existing holes is used and 4 new ones are drilled.
    The one question I did not answer was regarding the caliper. The GS caliper was used along with the GS rotor.
    #16
  17. R-dubb

    R-dubb Dubbious Adventurer

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    I have two of the large GS calipers. Send me a PM if interested.
    #17