Pike 454 not getting full travel

danimal
danimal Posts: 7
edited January 2008 in MTB workshop & tech
Hi,

I'm having a problem getting the full travel on my pikes. I have wound the u-turn adjuster all the way, but the lowers only move to the 125mm mark and not the 140mm. I can pull the lowers and it will go to 140mm, but once compressed only returns to 125mm. What could be causing this?

Any help appreciated.

Comments

  • supersonic
    supersonic Posts: 82,708
    Is it the coil or air uturn?
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  • danimal
    danimal Posts: 7
    air uturn
  • nicklouse
    nicklouse Posts: 50,673
    so what are the air settings like?
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  • danimal
    danimal Posts: 7
    I set them up with the recommended pressures in the manual. Although, this was some time ago, and I've not checked recently. To be honest the problem existed out of the box, I always meant to get them sorted, but due to family comitments I stopped riding for a while. I started getting out again in oct and since then the problem has been getiin worse. IE i used to get 135mm, now i get 125mm.
  • nicklouse
    nicklouse Posts: 50,673
    add more positive presure and see what happens. or reduce the neg air...
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  • The General
    The General Posts: 23
    Make sure you dont have more pressure in the negative air chamber than the positive air chamber.
  • danimal
    danimal Posts: 7
    ok thanks - I'll give that a try.
  • dave_hill
    dave_hill Posts: 3,877
    You do need to have SLIGHTLY more pressure in the negative chamber than the positive otherwise they top out horribly when they're wound up to 140mm.

    As an example I run 150lbs in the positive chamber and 155 to 160lbs in the negative. This is just enough to pull them into the stroke slightly and prevent top-out.
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  • gbrnole
    gbrnole Posts: 395
    You have too much negative air pressure which pulls the travel down, i have the same problem with mine.

    It's a bugger to set up, I want mine to be plusher and when I get it feeling right I can't get the full 140mm travel cos the neg air is pulling the travel down to as you say around 124mm, to compensate this I've put some more in the positive chamber which has just made them a lot stiffer but i get the full 140mm travel.
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