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  1. #1
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    Lefty length question

    Hi,
    I have just taken front end of my prophet apart to fit new headset bearings and whilst I had the lefty out I did the bearing reset procedure, but when I measure the fork as described in the manual it's only 690mm and not the 720-730mm the manual said it should be.
    Anybody got any ideas whats wrong?

  2. #2
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    Is it a Lefty Max? 690mm is about right for a DLR2/SL.

  3. #3
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    Yes it's a Lefty Max TPC.

  4. #4
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    All lefty Max should be around 720-730mm long when you removed the internals and do the bearing migration (reset) procedure.
    I had to reset the bearings on my brand new fork.
    I just hold the uppers and carefully slap the lower axle part with a soft rubber mallet.
    Do this carefully a couple of times and don't whack it too hard!
    Just tap it several times and re- measure.
    That should extend it back to 730mm.
    "Common sense isn't always that common!"
    Custom Prophet and Custom Delta V

  5. #5
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    I have given it a few good whacks but it's not moved at all!
    When I remove the boot and cycle the fork 3 of the inner races seem to be wiped of grease but the 4th is untouched. Is this indication that 1 of the bearings is well out of position and what can I try next to fix it.
    Cheers,

  6. #6
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    Have you definitely taken the top cap off and removed the split ring so the fork can extend past it's normal full length?

    If so, try hitting it harder!

  7. #7
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    Yes top cap off and split rings out. So it looks like it's time for a bigger hammer!!
    Wish me luck.

  8. #8
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    Well after 30 or so Thor like hammer blows latter it's now 728mm long.
    I don't think the guy that owned the bike before me ever touched it in 18 months.
    Thanks for the help.

  9. #9
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  10. #10
    All Lefty's, all the time Moderator
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    Cool technique, but considering the potential damage that exists in using a multi-directional impact generator, consider leaving the wheel on, grabbing it, and thrusting downward forcefully.
    This is a Pugs not some carbon wannabee pretzel wagon!!

    - FrostyStruthers



    www.mendoncyclesmith.com

  11. #11
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    Yep, you have to be very careful with hitting it. That's why I built my own little tool that presses the fork leg out. Only works with the internals removed though. You can only reset the bearings by pulling on the fork leg. If you just have to push downward they would reset after every jump when bottomed out and there would be no need for a "bearing migration reset", right? By overextending the fork the bearings actually roll up. I have used this "pull out" technique every since the first HeadShok came out in 92'
    Cheers.
    "Common sense isn't always that common!"
    Custom Prophet and Custom Delta V

  12. #12
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    how often

    are you resetting your bearings? Just curious if too soft of a spring makes this more frequent or migration just happens when it happens.

    REEK

  13. #13
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    I tried the other techniques mentioned on versus threads without any success before taking the rubber mallet to it!
    As yet I don't know if forks now working right as I'm still waiting for new headset and wheel bearings to arrive before I can get back out for a ride.
    The " little tool that presses the fork leg out" sounds interesting. If I have problems again I might ask for some details.

  14. #14
    All Lefty's, all the time Moderator
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    Quote Originally Posted by Bloated Badger
    I tried the other techniques mentioned on versus threads without any success before taking the rubber mallet to it!
    As yet I don't know if forks now working right as I'm still waiting for new headset and wheel bearings to arrive before I can get back out for a ride.
    The " little tool that presses the fork leg out" sounds interesting. If I have problems again I might ask for some details.

    Mallet's a bad idea. Downward thrusting is the factory specific method.... with the top end removed as per the directions of course.
    This is a Pugs not some carbon wannabee pretzel wagon!!

    - FrostyStruthers



    www.mendoncyclesmith.com

  15. #15
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    That's right.
    First I thought you meant pushing down on the handlebars.
    With the top cap removed and the bike in the work stand thrusting down works of course.
    Sometimes I just have to tap it with the rubber mallet to get the result I need.
    If you hit it too hard the bearing races might fracture or warp which then leads to even more trouble.
    "Common sense isn't always that common!"
    Custom Prophet and Custom Delta V

  16. #16
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    I would be afraid of damaging the axle strut by beating it with a mallet...

  17. #17
    All Lefty's, all the time Moderator
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    Quote Originally Posted by vitaccop
    I would be afraid of damaging the axle strut by beating it with a mallet...
    The boot, the frame, yeah, can't say I'd ever consider it, the conventional method works just fine. If it takes a hammer, chances are pretty good your bearing preload tolerance is way off.....
    This is a Pugs not some carbon wannabee pretzel wagon!!

    - FrostyStruthers



    www.mendoncyclesmith.com

  18. #18
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    I just reset my MAX 140 last weekend when I did a spring change.. it took all of 10 seconds... I just forcefully extended the fork a few times while the front wheel was still attached and the bike was in a stand- no mallet necessary. It seems like people are making this much more complicated than it really is.. no tools or major disassembly necessary.

  19. #19
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    Ok I take your comments onboard and thank you all for the concern you show for the welfare of my prophet, but all the telling off your giving me make me feel like a naughty school boy again!!
    To put your minds at rest it's all working fine now.
    Cheers

  20. #20
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    I don't think there is any intention of insulting you or saying you are stupid.. the whole point of the forum is to share info and learn new stuff.. all everyone is saying is that using a mallet to do a bearing reset could lead to damage to the Lefty- that's all.

    That being said.. I know how you feel about getting 'beat up' here.. I've posted a few reasonable questions in the past and the super smart-a$$ replies made me quit participating for a while.

  21. #21
    All Lefty's, all the time Moderator
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    Quote Originally Posted by Bloated Badger
    Ok I take your comments onboard and thank you all for the concern you show for the welfare of my prophet, but all the telling off your giving me make me feel like a naughty school boy again!!
    To put your minds at rest it's all working fine now.
    Cheers
    No worries, we're not talking down at you Many on here have information that is not really the proper method, but since it works, they tell everyone about it. I've heard many different ways to do it, most work, but it's matter of time before it creates damage. We're a friendly lot here, it's the other forums you get bashed on for asking a question that is considered "stupid" by some.....Keep 'em coming, we want your bike as happy as can be
    This is a Pugs not some carbon wannabee pretzel wagon!!

    - FrostyStruthers



    www.mendoncyclesmith.com

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