1. Adventure Rider Print Magazine!
    We're doing a print magazine this November - 128 pages of high quality adventure riding stories, photography and interviews!

    Click here to purchase a copy for $9. Limited copies still available.
    Dismiss Notice

[Front] Race Sag?

Discussion in 'The Garage' started by GoGoGavin41, May 11, 2016.

  1. shovelstrokeed

    shovelstrokeed Long timer

    Joined:
    Jun 20, 2003
    Oddometer:
    5,708
    Location:
    6South Florida
    No amount of preload will change the rate of the springs, all it does is allow the springs to coil bind sooner. If your springs are too soft, change them and try to stick with factory preload spacers. Sorry, there is no cheap way out of this.
    #21
  2. Chuckracer

    Chuckracer Jerkus Maximus

    Joined:
    Aug 26, 2007
    Oddometer:
    10,879
    Location:
    Dexter, NY
    As a former KTM 9X0 Adventure owner (X3), I can promise you your fork springs are WAY too soft.
    #22
  3. jrc58

    jrc58 Been here awhile

    Joined:
    Jun 21, 2015
    Oddometer:
    367
    Location:
    Spain
    Hi.

    I weight with jacket and helmet over 95 kilograms.

    Original Front suspension travel ktm 1290 SAdv : 200 mm
    Original Rear suspension travel ktm 1290 SAdv : 200 mm

    These are the measures of my KTM 1290 Super Adventure.

    F1 and R1 The bike raised from the ground.
    F2 and R2 The bike on the floor.
    F3 and R3 The bike with me on top.

    FORK :

    F1 : 248 mm
    F2 : 197 mm the preload position 1 passenger
    F3 : 176 mm the preload position 1 passenger

    SHOCK ABSORBER :

    R1 : 560 mm
    R2 : 541 mm the preload position 1 passenger
    R3 : 509 mm the preload position 1 passenger

    What is your opinion ?
    With these measures, what is the static SAG and what is the dynamic SAG ?
    Are the SAG´s OK or not?

    Regards.
    #23
  4. plumer1kt

    plumer1kt Adventurer

    Joined:
    Feb 11, 2015
    Oddometer:
    1,354
    Location:
    Hellas
    before any adjustment to your suspension make sure that
    1)wheel bearings, wheel balance and tire pressures are ok
    2)steering bearings are ok
    3)internal friction of the forks is minimal (check by taking 2 static sag measurements , after pushing the forks and after pulling the forks) and service them if need to
    4)good rear linkage/swingarm/shock operation replace/clean/grease everything if need to
    after that set the rear sag with you and your gear.
    that"s the first thing you must do.set it with preload and replace spring if need with other
    then try to balance rear and front suspension by setting your front sag
    both sides of the bike must move together up and down


    that is not for street bikes only
    next adjust rear dumping to your riding skills/habits/terrain ,fast or slow damping
    and adjust the front damping to balance the bike (watch the video)
    adjusting front sag alters front height of the bike if you increase it the front dives and can make you turn easier
    but can bottom out in heavy braking or big bumps
    if you decrease it the front rises ,the bike understeer but can pass big bumps or can be stable in heavy braking
    so what is your sag?when you adjust your bike to your needs you can measure it and find out in the end.
    rule of thumb---going from rear to front and adjust first spring rate then preload,compression damping and last rebound damping.
    step by step and write down every adjustment you do
    balance the bike
    if you ride a balanced bike you feel like it"s part of your body
    if you succeed you will be amazed
    #24
  5. Dao1

    Dao1 Long timer

    Joined:
    Mar 17, 2014
    Oddometer:
    1,984
    Location:
    Austin TX
    jrc58:

    Your dynamic sag (F/R1-F/R3 divided by total sups travel) is typically 25%-33% of total susp travel, depending on comfort vs. performance preferences and handling characteristics.
    Thus, your rr dynamic sag = 25%
    Fr dynamic sag is @ 36% of total susp travel, so this is on the soft side, but not by much.

    static sag....this is typically 25mm-35mm for offroad.
    your rr static sag is in the ballpark @ 32mm. (541mm-509mm)
    your fr static sag is @ 21mm, which suggests your spring is on the soft side, again not by much, imho.
    #25
  6. jrc58

    jrc58 Been here awhile

    Joined:
    Jun 21, 2015
    Oddometer:
    367
    Location:
    Spain
    DE ACUERDO
    Gracias
    #26