BMW G650XChallenge FRONT SUSPENSION

Discussion in 'Thumpers' started by lkongo, Oct 21, 2007.

  1. Bli55

    Bli55 -

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    You're right! My bad.... :deal
    The length of the chromed part of the forks is ~280 mm, so that stuck with me...
    So that extra length - is it for dirt to be pushed out to when the bike bottoms out?
  2. gsstampeder

    gsstampeder Long timer

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    Thanks all for the help. I picked the bike up this morning and talked to the tech that diagnosed the catastrophe. As he was explaining to me that the one shock purged easily while the other would not. It was like a pogo...I explained that one fork was for compression, the other was rebound (I do believe that is how it works ...isn't it?) Once he heard that it 'all made sense' then. :huh

    I took the bike out for a nice spirited ride over some back road gravel and a few trails and it seems to be working fine. Great actually...well at least for what I'm capable of pushing it. I do have some wear marks on the chrome tubes that I guess is ok. Normal wear? I'll pick up some neoprene fork socks and protect the seals a bit better, but otherwise all seems to be good.

    Sorry for the false alarm and thanks again for offering help.
  3. john_aero

    john_aero Long timer

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    looking at seeing if can get funds to fit some wp43 forks

    curious, if i remove and replace lower cast sections i have to machine the out to allow the lower adjusted to fit into the bmw cast section

    if i fit full forks and keep stock wp unit, can i just make up spacers to shim wheel centred or does it greatly affect the calliper also?

    reason being is i want to try sell my own xch forks so would rather not remove the cast legs
  4. LukasM

    LukasM Long timer

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    I would also sell your stock forks complete, you should be able to get more for them than you pay for the WPs. Find somebody in a strict TÜV country like Germany, where forks different from stock are illegal.

    Then you just need a new axle, wheel spacers and caliper bracket.
  5. Bli55

    Bli55 -

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    I understand WP 43 mm can be fitted into original triple clamps...
    If one were to go with forks that required different mounting diameter (WP 45, Marzocchi 50, etc...), are there any other bikes which use stock 210mm fork spacing?
  6. john_aero

    john_aero Long timer

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    yes very true.

    made up plenty axels for bike so thats simple job.

    more likely use bmw axel and press aluminium rod onto them then turn it down to suit fork leg diameter

    had look some proposed irish laws and soon non stock parts may be illegal here too. better mod the heck outa my 2 bikes so
  7. Colebatch

    Colebatch "Moto Porn"ographer

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    not really.

    If you go for other forks, then you basically need to get the triple clamps from the bike you got the forks with.

    It is worth noting that Erik at Hot Rod was looking into making a lower triple clamp to fit WP 48mm forks into the XC with 210mm spacing.

    He is able to reuse the top triple clamp because its 54mm diameter - same as the WP 48mm top mount. He just needs a 60mm lower clamp with the same offset (25mm) as the BMW one. Depending on what front wheel you wanted to run (keep the XC one or swap to a KTM one) Erik will be able to work out what combination of spacers, axles and brake caliper you need to make that work.
  8. mbfj40

    mbfj40 Been here awhile

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    Emig Racing already has such a product for the X-bikes. I have one on my '08 XCountry with the WP 4860's and it works and fits great. I made up my own axel spacers and brake adapter and am using the stock front wheel. But they offer everything in a complete package if you want. And a replacement top clamp that mounts their steering damper as well. The top clamp/damper assembly can be used with or without the fork conversion kit if you still have money to spend.
    mike
    http://www.emigracing.com/BMWXConversion.htm

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  9. john_aero

    john_aero Long timer

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    ,any thanks to LukasM off here.

    xchalleneg forks sold and a serviced set of wp43 on their way to me, and all i had do was post them.

    cheers mate very helpfull

    must route out some alu bar stock to run off some spacers now
  10. Viv

    Viv Adventurer

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    I have some Shivers from a Husky 610 and they have the 58mm lowers. I could have them machined to 57mm or have the bottom yokes opened by machining to 58mm.

    Alternatively is it possible to use the original Xchallenge upper part (the outer slider) and fit the Shivers parts to that?

    Viv
  11. WayneC

    WayneC Long timer

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    Re the caliper hanger built in post 568 on the previous page, the caliper hangers are normally a stock Brembo part, the caliper looks like the same as the 650GS/KTM950 and the caliper hanger from a KTM 950 would be the part to get rather than making one up
  12. MJS

    MJS Long timer

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    You can machine the outer down to 57mm or use the stock X-C upper. There is not enough material to open the bottom tripple.
  13. cobrakai

    cobrakai Adventurer

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    To those of you who swapped over to a 45mm shiver by switching lugs only.

    Was it worth it? Does the fork actually have high speed bump compliance now?

    What should I expect to pay for a 45mm shiver fork? Not counting having to swap/machine the lugs, respring, preload spacers, etc. Just the price of a base fork.
  14. Viv

    Viv Adventurer

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    In the UK I paid £100 for Shivers off a 610TE Husky and that included the yokes.

    Not fitted them yet so can't comment against your other questions.

    Viv
  15. cobrakai

    cobrakai Adventurer

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    bloody cheap!
  16. cobrakai

    cobrakai Adventurer

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    Another question...

    Found a set with 58.4mm lower clamp and 53mm upper clamp. This is the wrong size for both. I really don't want to machine the lower clamp or shim the upper clamp area. Can anyone confirm that I can simply use my stock upper tube, and swap all the other parts over? Can the seals and bushings also swap over?
  17. Viv

    Viv Adventurer

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    Post 572 above?

    Viv
  18. Viv

    Viv Adventurer

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  19. cobrakai

    cobrakai Adventurer

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    Looks good. That's about $250 shipped to me in the US. Since I'm just going to simply swap dampers and lugs it doesn't matter if they're a bit beat up and the seals are all leaky.
  20. HowlingMad

    HowlingMad drags knuckles

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    I just picked up an XC and am a wee disappointed in the forks. I haven't made my way through the entire thread yet, but has anyone explored replacing them with g450x forks? They would appear to be very similar.

    Thoughts?

    Edit, just looked them up, $1175 per leg? Did I read that right?