KTM 17mm axle 26mm wheel

Discussion in 'Thumpers' started by mrlarner, Jan 31, 2011.

  1. mrlarner

    mrlarner Adventurer

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    Hey guys,

    I'm wanting to stick a newer 26mm front wheel on a 98 640a with a 17 mm axle. Does anyone make a 17 to 26mm spacer? Can I use a bigger bearing, maybe one that has an inner diameter of 20mm, so I can use a 17 to 20 mm spacer? Or is there a way to bump up my axle size without a new front end?

    Weighing my options here. Thanks for any input!
    #1
  2. kubiak

    kubiak Long timer

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    there are bearing spacers i used to run a 17mm axle to a 20mm bearing. i got them from motion industries in fresno, california. hope this helps!
    #2
  3. jonnyw

    jonnyw Been here awhile

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    THERE ARE COMPANIES(zipty racing?) MAKING THE 20 TO 26 CONVERSIONS ALREADY. Sorry had caps on. Maybe you can get a 20 mm axle and use these spacers. You should be able to find bearings to fit(00-03?) Might be cheaper/easier to find another wheel.:lol3
    #3
  4. christian

    christian Long timer

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    cjracer used to make a special axle to fit 20mm wheels.
    with that and a 20 to 26mm adapter you could fit them.

    I inquired about it, as I got an other 640 ('00) with 17mm axle but he hasn't made any lately due to lack of demand...

    check with him see if he would do a run, I could be interested in one.
    #4
  5. rz35027

    rz35027 Been here awhile

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    I would be interested in those adapters also.....
    #5
  6. mrlarner

    mrlarner Adventurer

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    I like the sound of this.

    Also, I wonder what the problems would be using a bearing with an outer diameter that fits in the 26mm hub, but an inner to fit a 17 or 20 mm axle. Are bigger bearings bad?

    But anyway, a 17 to 20mm axle might be the joint.

    #6
  7. christian

    christian Long timer

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    I PMed Cjracer again, let's see if he chime in this thread.
    #7
  8. katumo_jtb

    katumo_jtb bogus journeyer

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    Add me to the list of people interested in a 17mm to 20mm axle conversion.

    Edit: MrLarner, you can't simply swap bearings because the hubs changed. There is no 20mm ID bearing with the right OD to fit the early hubs (I checked). At least there isn't a standard sized bearing, you could have some custom made I guess. And even if you could find bearings to fit the axle, they wouldn't be the right width to fit the stock spacers, so you'd have to make new spacers.
    #8
  9. mrlarner

    mrlarner Adventurer

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    Figured as much, tho cutting a spacer is heaps easier than machining a new axle.

    I think I'm going to put some effort into machining the step-up axle myself (unless cjracer comes through :evil) if I can get my hands on a 20mm hub. I'll let you guys know if it turns out.

    #9
  10. christian

    christian Long timer

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    I am in contact with cjracer, and we are looking into it.

    Making a spacer for 20mm wheels is not reasonable, spacer would be too thin - the axle is a possible solution but cost might be high.

    So an idea is to make spacers for 26mm wheels to fit on 17mm axle.

    I am guessing, people with bike with a 17mm axle don't have wheels yet, so we could be shopping for 20mm or 26mm. 26mm seems more common 03+ RFS/2stroke. Also cost would be drastically less for just spacers.

    So a quick poll,... are people interested dead set on 20mm... or a 26mm spacers for 17mm be just as good.

    I am fine with 26mm wheels - please let us know.

    Questions:
    1- Do you have extra wheels already? if yes, what axle size?
    2- how much are you willing to pay for an 20mm axle?
    3- How much are you willing to pay for 26mm spacers?

    my answers:
    1- Do you have wheels already? if yes, what axle size? NO WHEELS YET
    2- how much are you willing to pay for an 20mm axle? $100
    3- How much are you willing to pay for 26mm spacers? $50

    Thank you
    #10
  11. wrk2surf

    wrk2surf on the gas or brakes

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  12. christian

    christian Long timer

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    #12
  13. rz35027

    rz35027 Been here awhile

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    2) $0
    3) $50
    #13
  14. wrk2surf

    wrk2surf on the gas or brakes

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    mis understood those are for adapting a 17mm to 26 drop outs.. good luck
    #14
  15. nanno

    nanno Been here awhile

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    Why don't you just check the outer bearing diameter or the DIN-No. on the bearing and just get a new set of wheelbearings. 17mm inner diameter is definitively a std. DIN-bearing (as is 20mm inner-diameter)

    Cheers,
    Greg
    #15
  16. katumo_jtb

    katumo_jtb bogus journeyer

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    1. Yes, one 20mm wheel, one 26mm hub
    2. $50
    3. $50

    Nanno, see my post above. I already checked, standard bearing sizes don't work. The diameter of the hub changed between the 17/20/26mm bearings.
    #16
  17. Highside>Lowside

    Highside>Lowside Hairier Than Thou

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    1) No
    2) $85
    3) $50


    (20 or 26 would be fine)
    #17
  18. cjracer

    cjracer AWD please!!

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    We're looking into this for a small batch run.

    There is no way we can build an axle for the prices requested this time around for this small of a run.

    We'll looking more into a 17-26mm adaptor bushing kit as the 17-20mm would have a spacer too thin and the reason I made an axle the first time around 4 yrs ago.
    Pricing for the bushing sets are not set until we can get a test set made and a quantity verified how many we need to make.
    :ear
    #18
  19. katumo_jtb

    katumo_jtb bogus journeyer

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    Thanks for the update cjracer. Sounds like the 17 to 26 sleeve might be the way to go. I assume the 17mm spacers would be too small to just sleeve the wheel, are you thinking about sleeving the whole axle? In that case the 26mm spacers/speedo are probably the wrong width and this setup would require custom spacers. Would that kill the price?
    #19
  20. cjracer

    cjracer AWD please!!

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    I don't have a LC4 anymore to work from. Christian and I are hoping to work something out.

    I found that unless you change to another speedo drive from the 17" wheel of that time. (Expensive) The speedo was not accurate. I switched to a Trail Tech computer w/ a magnetic pickup. I kept snapping the Drive cable from wheelies. It was cheaper in the long run to swap to a different computer.

    To do stuff correctly it takes time and sometimes more money than you thought when you look into all the options.

    The newer 26mm/17" hubs don't have a mechanical drive on them anyway IIRC. You'd have to run w/ no speedo, or change to an electronic system.

    Every rider has to look into there own needs and what they can afford.

    I'll update more when we have something off the lathe.
    #20