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Thread: what is the point in sag?

  1. #1
    Join Date
    Jun 2010
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    53

    what is the point in sag?

    Having noticed that there was little/no sag when I got on my bike, I decided to take air out of my fork which did indeed give me my sag.

    When out riding and pulling the front brake I was a little uncomfortable with the front sinking feeling and my weight being drawn towards the bars.

    There is probably a 'balance' to be found but what is really achieved with sag?

  2. #2
    Join Date
    Oct 2004
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    2,010

    Re: what is the point in sag?

    its so the wheel stays on the ground when you go over dips drops etc, lets the forks extend so you dont go airbourn and loose traction, some bike have 4" sag on the rear its normal, also is the dip when braking, get used to it and lean back as that just the forks working right...

  3. #3
    Join Date
    Aug 2011
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    Portstewart
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    114

    Re: what is the point in sag?

    if you have LSC (low speed compression) have a play with the settings as this will have an effect on the brake dive your experiencing

  4. #4
    Join Date
    Oct 2004
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    Bellshaft
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    Re: what is the point in sag?

    its a spring. If it didn't compress when you put a load on it (your weight when you climb on) then its not working properly. So you need sag, or your forks will never compress far enough under a big hit. So get used to some brake dive, the forks are only doing what they should, if you have compression damping, think about using more, but that may affect your small bump performance. Then again, if they were as stiff as you say they were, you probably didn't have much of that anyway!

  5. #5
    Join Date
    May 2005
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    Crossnamuckley
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    524

    Re: what is the point in sag?

    It's a natural part of getting older. Try not to worry about it too much. Women suffer from it worse though. You could try one of these;

  6. #6
    Join Date
    Apr 2008
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    Bangor
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    Re: what is the point in sag?

    Quote Originally Posted by Miki View Post
    It's a natural part of getting older. Try not to worry about it too much. Women suffer from it worse though. You could try one of these;
    Thats just frigin nasty !!! put me off me cheese puffs...

  7. #7
    Join Date
    Jun 2009
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    Fermanagh
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    2,330

    Re: what is the point in sag?

    If your fork isnt adjusted properly then its just a hindrance. Either go rigid or have a look at THIS

    Lots of info in this, a bit of reading involved but it lets you understand what your fork is about including all about sag

  8. #8
    Join Date
    Feb 2009
    Location
    Costa del North Down
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    1,932

    Re: what is the point in sag?

    Sag is the compression of the front or rear suspension caused by the rider's weight & is the most important suspension setting (especially on the rear). Correct sag allows the wheels to follow the contour of the terrain as you ride and has the biggest effect on how the bike feels.
    By having the correct amount of sag the wheels will not only be able to rise up over any obstacle it will also allow the wheel to fall into most holes. In this way the rider should not feel much variation in bike movement as you track across rough ground. Sag is expressed as a percentage of maximum travel.

    Sag is very difficult to measure on front forks as it is difficult to know where to centre your weight on the bike. Some people ride with their weight way back over the rear wheel whilst others attack the trail & have their weight over the front. It is therefore difficult to make specific recommendations on spring selection or air pressures for forks apart from to go with the manufactures guidelines in your owners manual intially. If you find on the trail that things are too soft/hard adjust the air pressure or take another spring.

    On Rear shocks sag is expressed as a percentage of maximum stroke and is best set at 20-30% for XC (firm), 25-35% for Enduro and 25-45% Downhill. The better damped a shock the more sag you can usually run because the compression damping will prevent the shock from blowing through it's travel. This allows you to run deeper in the stroke without blowing through the travel giving better control over braking bumps & cornering stability (due to lower centre of gravity).

    Thanks TFtuned

  9. #9
    Join Date
    Jun 2010
    Posts
    53

    Re: what is the point in sag?

    Thanks for the responses lads, some more useful than others!!

    I'll have a read through the Fox manual for the rear setup, thanks Aul han.

    I found the manual for my fork here:

    http://www.wheresweyland.com/images/...2006-66-sl.pdf

  10. #10
    Join Date
    Jun 2009
    Location
    Fermanagh
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    2,330

    Re: what is the point in sag?

    THIS may help explain why you have sag.

    May also help explain how responsive a fork needs to be for it to work well.

  11. #11
    Join Date
    Oct 2004
    Posts
    2,010

    Re: what is the point in sag?

    They aren't responsive look at theses custom tunned bad boys move...
    http://contour.com/stories/888-avalanche
    zero arm pump in the alps =sweet as....

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