SAG on marzocchi mz forks

jaybo1973
jaybo1973 Posts: 301
edited March 2008 in MTB workshop & tech
]Hi guys

Just bought my new bike tYesterday (kona cinder cone 2007) a decent mid range bike that suits my needs

I have never had a suspension bike before. Just been looking at the instructiins to get em set up for SAG. (SAG = H1 - H2) H1 = length of leg. H2 = legth of leg while sitting on the bike. SAG = total travel x sinking percentage.

So H1 =110, H2 =93 so SAG = 17mm. they recommend 15% to 20% sinking percentage. so 17 x 20= 340mm,
Or is it 20% of 17 which is 3.4

Which ever answer it is, how do you apply this to your forks?

Thanks

Comments

  • supersonic
    supersonic Posts: 82,708
    It is percentage of total travel. Put a tie wrap on the fork stanchion against the seal, get on the bike slowly in your normal riding position, get off and measure how muich it has moved. So if the fork has 100mm of travel, you want it to move around 20mm. Bware that forks from new can take some time to bed in.
    GT ZASKAR CARBON TEAM

    VOODOO CANZO

    Come and see me at https://www.facebook.com/biketyke/
  • jaybo1973
    jaybo1973 Posts: 301
    Hi mate

    Thanks for the quick reply, I must sound really dumb. The total length is 110mm, whilst I am seated it is 93mm (used the missus unstesd of a tie wrap) Thats 17mm.

    I have the dial set fully anti clockwise to the minus -, is it just a matter of keep turning the dial to the + until the travel is 20mm?
  • supersonic
    supersonic Posts: 82,708
    Total leg length doesnt always reflect total travel. Turning the dial clokwise adds preload, which reduces sag, and vice versa. It is only used for fine tuning, you may need a new spring if you cant get wghat you want.

    I'm gonna be honest with you here, this is not a good fork! I thought that kona had the Dart2, which is much better.
    GT ZASKAR CARBON TEAM

    VOODOO CANZO

    Come and see me at https://www.facebook.com/biketyke/
  • jaybo1973
    jaybo1973 Posts: 301
    I believe it was made with both. So for now, should I leave it fully anti clockwise until it has been used for a while?
  • jaybo1973
    jaybo1973 Posts: 301
    Ok, just found the table which shows what the SAG should be. 21mm. (105mm travel)

    A combination of my missus being crap with a tape measure and me leaving a foot on the floor caused the school boy error. I make the SAG 22m with the dial fully anti clockwise
  • supersonic
    supersonic Posts: 82,708
    Keep it like that, and go ride! Sag is a guideline - many xc racers use 15%, trail riders maybe 30%.
    GT ZASKAR CARBON TEAM

    VOODOO CANZO

    Come and see me at https://www.facebook.com/biketyke/
  • jaybo1973
    jaybo1973 Posts: 301
    supersonic wrote:
    Total leg length doesnt always reflect total travel. Turning the dial clokwise adds preload, which reduces sag, and vice versa. It is only used for fine tuning, you may need a new spring if you cant get wghat you want.

    I'm gonna be honest with you here, this is not a good fork! I thought that kona had the Dart2, which is much better.

    Looks like the marzocchi was filtered down from the caldera. http://www.konabikes.co.uk/2k7bikes/caldera_2k7.php

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