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  1. #1
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    Lefty 140 PBR - harsh compresion spike?

    OK...

    So i finally got my Lefty 140 PBR 2010 ...

    Had my first ride on it yesterday and I find it has a mean compression spike when hitting square edge hits (even speed bumps on the road at speed)

    Could this be because of the oil weight?

    Has anyone else had this issue?

  2. #2
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    air pressure

    What air pressure are you running? And what is your rebound knob set at and are you using the pbr button on the street? I got my pbr about 2 months ago and I love it so far. I got the oil changed to 7 weight to help with knocking on long down h ills and it helps to slow the rebound a bit I think. I'm 190 there is a nice pbr tune thred and in the 29er there is one that talks about whick methods to use to limit air volume and where to buy them.

    Karl

  3. #3
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    Hi
    No I have not used the pbr button as of yet, have not found the need to use it.

    I am running about 170 psi in the shock, if i can remember correctly and weigh in at 85kg, I find that i can almost fully compress the fork next to the bike when pushing down, the fork is not bottoming out though.

    I did read about a spacer that you can put in the fork to stop of fromm diving to much and that the newer models have that spacer in already. I will have to open mine to see if I have it.

    Ill read up some, maybe i just need a oil change as at the moment my revelation was way better than this in hitting square edge hits (reason i got the fork was i heard the needle bearings make square edge hits were buttery smooth)

  4. #4
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    The 2011 will have the spacer. Our forks don't have them. Your lbs should be able to change the shock fluid on your fork to 7 weight and I'm 190 lb and I only run 145 psi on my pbr. That could explain the harshness the high psi????

  5. #5
    All Lefty's, all the time Moderator
    Reputation: MendonCycleSmith's Avatar
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    If you have 170 psi in there, and can compress it (almost fully) while standing along side the bike, you need to take it back to the dealer, and get it fixed. Sounds like you have back pressure in there somehow.

    Oil weight change is irrelevant to your issue.
    This is a Pugs not some carbon wannabee pretzel wagon!!

    - FrostyStruthers



    www.mendoncyclesmith.com

  6. #6
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    I have the RZ140 carbon 1 and with riding gear weigh 80kg/176 pounds and I run 100 psi in my fork. Seems nice and plush but I do get play at the top of the travel and have to do bearing resets every 5 or so rides to get rid of the noise/play.

  7. #7
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    ok, seems my pump is not working...pumped it up and it is fine...although i still get spiking coming through the fork when hitting things... going to try a lighter oil ..

  8. #8
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    Lighter oil will speed up the rebound

  9. #9
    mtbr member
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    what can I do to decrease compression dampening?

  10. #10
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    From what I was readng in the thread titled lefty 130 tune, that hevier oil will help to slow down the rebound.

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