Lowering a Boxxer

Discussion in 'Downhill & Freeride' started by dcrides, Jan 22, 2008.

  1. dcrides

    dcrides Chimp

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    I have a Specialized SX Trail that I use for downhill racing. The stock 66 that I have now just isn't cutting it. I also have a 07 boxxer race that I would like to run this coming season, but it has too much travel. How exactly do I lower the fork to about 180mm? I have done some research but have only determined that I need to add all travel spacers and cut the springs down accordingly. Do I need to do this for both legs of the fork? Also, where can I get these spacers- do I buy them from Rockshox or can I get something comparable at a hardware store? Any words of wisdom or advice would be appreciated. Thanks.
     

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  2. bushrider

    bushrider Monkey

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    You can convert any boxxer with the internals from a boxxer ride.
    It has a u-turn adjuster that adjusts between 4.25" and 7".

    I have a spare u-turn kit as I converted my 05 ride to a WC Air.
    Its new an unused. Send me a PM.

    If you were to upgrade one leg to solo air you can reduce the travel by adding spacers above the top out bumpers on the air side.
    Cavedweller on ths board runs a 7" boxxer WC.
     
  3. dcrides

    dcrides Chimp

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    Thanks, pm sent.
     
  4. davep

    davep Turbo Monkey

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    In theory, you need a shorter spring, and a spacer equal to the loss in spring length. The spacer would go on the spring shaft between the top out bumper/spring and the top of the shaft. There is only one spring and thus only one spring shaft in the newer boxxers.

    Here is where things get interesting (depending on the fork).

    If you just hack off the spring, it will not sit on the spring perch correctly and will either bend to one side durring compression (causing noise an posible long term wear), or scratch the inside of your stanchion, or both.

    You could just add the spacer and not cut the spring, but this would add preload in the amount of the spacer..not a great thing.

    You could also add a spacer to the b/o bumper and then lower your crowns an equal amount (you will most likely need a stiffer spring for this method)..... but if your figures are off, or your spacer malfunctions some how, your crown will bottom into your tire....causing an instant loss of teeth.
     
  5. bent^biker

    bent^biker Turbo Monkey

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    hold on hold on, doesn't the 66 have 180mm? why would you want to cut the boxxer down to that if it isn't working for you?
     
  6. dcrides

    dcrides Chimp

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    The 66 has 160mm. But if I were to use the U-turn kit, would it be as simple as changing out the old spring for the new kit? Would I have to make any modifications?
     
  7. davep

    davep Turbo Monkey

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    It is a spring/shaft assembly all in one. No mods needed, but it is a tiny bit more work than just a standard spring swap (you need to undo the footnut and most likely replace the bushing lube in the spring side).
     
  8. ZHendo

    ZHendo Turbo Monkey

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    i thought that the boxxers had the all travel feature?
     
  9. dcrides

    dcrides Chimp

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    Thanks. It sound to me like the u-turn route will be the most reliable way to lower the travel (without potential loss of teeth or destroying the fork).
     
  10. TWeerts

    TWeerts Monkey

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    the sticker on the frames say "no greater than 175mm fork". i have a RS Domain, which has 180 and have no problem with it. the point here is that the boxxers have the exact same axel to crown distance as the domains and boxxers. so you wouldnt need to cut the travel down in fear of damaging the frame. if you are ok with 8 inches, i wouldnt bother. mounting a boxxer w/ full travel is safe.
     
  11. dcrides

    dcrides Chimp

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    Yeah I assumed it would be ok. I like my bike pretty slack but I want it a little lower and more even with the rear.
     
  12. DirtyMike

    DirtyMike Turbo Fluffer

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    Is there more than one 66 as far as travel options, I thought they were a 180 mm fork, I know mine is. Guess I will have to check the site myself


    Edit.....Is it an 06, and what Model do you have??

    Ok, research done, 05 66vf was 150, all others were minimum of 170, some adjustable down to 140, but if 07 or newer, it was 180
     
  13. miuan

    miuan Monkey

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    Is there a possibility to use an all travel spacer from whatever RS 32mm XC fork in the Boxxer WC? Guess there should be no problem.
     
  14. SnowboardinWA

    SnowboardinWA Monkey

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    just run a Fox 36, thats what I'll be pimpin
     
  15. dhkid

    dhkid Turbo Monkey

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    :stupid:

    the axle to crown height of a boxxer at 7inches is just around a 36 at 6 inches. not sure how it compares to a 66, but leaving it at 8inches wont be much difference from your 66.
     
  16. dcrides

    dcrides Chimp

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    The fork on the sx is a 07 66rv that is oem and comes stock.

    Yeah, I'll see how the boxxer rides, but I'll probably still end up lowering it.
     
  17. DirtyMike

    DirtyMike Turbo Fluffer

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    That should be a 180. I will make a phone call to make sure, but I am prety sure it is.
     
  18. Dogboy

    Dogboy Turbo Monkey

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    If it is a 2005 66 at 160mm it is actually taller than a 200mm boxxer. If so, I would just leave it as is.

    edit: nevermind, just read your post about the year model.
     
  19. PDS RX

    PDS RX Monkey

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    just lower the ride hight by getting the flat crowns, 8 inchs won't be to much travel for your bike
     
  20. Dogboy

    Dogboy Turbo Monkey

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    There is only one lower crown style for the Boxxer. Upper crown does not really affect ride height.
     
  21. dcrides

    dcrides Chimp

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    The fork is oem. The specialized website says 160 and my measurments say 160.
     
  22. TWeerts

    TWeerts Monkey

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    thats what i was saying.

    from RS site:axel to crown measurements:
    Boxxer: 568mm, @203mm of travel
    Domain/Totem:565mm, @180mm of travel

    that looks pretty close to me!

    Check It
     
  23. dcrides

    dcrides Chimp

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    Looks good thanks for the info.