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KTM Shock Sag Adjustment and Setup - Cycle News
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- Опубликовано: 29 авг 2017
- KTM Shock Sag Adjustment and Settings
KTM Shock Sag Adjustment is a crucial step for proper bike setup. Each KTM is engineered to work best at a certain suspension balance. The spring in the shock is adjustable to ensure the bike can be set properly for your weight.
To start, make a mark with a marker on the rear fender. Newer KTM’s have SAG written on the fender marking a good spot for measurements. It’s important to always measure in the same location.
You can use a purpose-built motorcycle sag scale or a tape measure-anything to get accurate measurements. We prefer a sag scale because it’s easy to set to “zero” when the bike is elevated on a center stand-the first measurement in the sag-setting procedure.
Make sure the bike is fully off the ground on a center stand and zero out your sag scale or, if you’re using a tape measure, write down this first measurement so you can do some math later.
Next, remove the bike from the stand and have the rider, in full riding gear, sit on the bike in a neutral position. The rider can bounce a few times to settle the shock, or another person can push down on the rear of the bike a couple times to settle it into a position. Having someone balance the bike while the rider sits still for measurement is helpful.
Typical rider sag settings (the amount the rider squats the rear shock) are generally between 100mm and 110mm. Check what KTM recommends for your specific year and model and use that as where you should start.
Adjusting the sag
If the sag is out of the recommended spec, place the bike back on a center stand. Take a marker and make a mark on the adjustment ring on the shock so you can tell when you’ve made a full turn of adjustment. KTM uses a lock ring with a 4mm allen to hold the adjustment ring. Loosen this before trying to make adjustments.
If you need more sag, loosen the adjustment ring so the spring has less tension. If you need to reduce the amount of sag, tighten the spring tension by tightening the lock ring down. Sometimes, you can turn the spring and adjuster by hand. If it’s too difficult to move by hand, use a lever. Place a rag between the lever and the frame or shock reservoir (depending on which way you’re turning the lock ring) and turn the lock ring one step at a time.
A full turn of the lock ring is approximately 3mm of sag adjustment in either direction. Measure the sag with the rider again to confirm you’re within spec. If you are, tighten the lock ring. If not, continue to adjust the spring tension until you are. Then, tighten the lock ring. Don’t forget to tighten the lock ring!
There’s a possibility the stock rear shock spring is not the proper spring rate for the rider’s weight.
Free Sag
A great way to determine if the spring rate on the bike is right for the rider is by checking Free Sag. Free sag is the amount of sag (or how much the shock is compressing) without the weight of the rider.
To see if the spring is right first set the proper rider sag as described above and then check Free Sag by simply measuring with the bike level on the ground without a rider. Proper free sag varies between years, makes and models, but for KTM it is typically between 30mm and 45mm.
If free sag is outside the manufacturer’s recommended range, a different spring of a different spring rate is typically needed. If free sag is less than 30mm after rider sag is set properly, you likely need a stiffer shock spring. If free sag is more than 45mm, you likely need a softer spring to get the bike in-range.
Once your KTM Shock Sag Adjustment is dialed in with proper sag settings and the correct spring rate for a rider’s weight, it will work optimally, just like it was designed to.
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Just a comment because i just did this... If you do not own a stand for your dirt bike.. you need to get the weight off back wheel before touching the spring because once the spring is under compression nothing will turn. I know this is obvious but it still helps to remind people.
Have less than 30 mm of sag than you need a softer Spring. If you have more than 45 mm of sag then you need a stiffer Spring.
Can these be fitted to any weigth like 50-60 kg
Damn!! That's a beautiful bike dude !!
So let's say you need to go up in spring rate because of a heavier rider. Then you put the rider on the bike and get your sag where it needs to be. The free sag will not be within the recommended range because with a stiffer spring the bike will sag less under it's own weight. So why even bother with free sag?
That would be true if the preload adjuster collar was in the exact same spot with the stiffer spring, but it won’t be. Put a stiffer spring on the bike and the same rider will wind the preload collar higher up (less preload) to get the right sag. Now when they get off the bike the free sag will hopefully be right.
What if you want a stiff rear end? So you have little sag
Yes, less sag will create a stiffer rear end.
@@cyclenews nice.
I am 78kg and sag on a 2019 KTM 500 I tried to sit on was maybe 2-3cm and I could bearly reach the ground with my toes and I am 1,74m tall... I asked KTM dealership salesman if it was not possible to adjust it so I could reach and he said that was a bad idea because it was supposed to be like that was his argumentation. Seems he had no idea how to adjust the proper sag on a KTM. A 2017 KTM 300 2 stroke I did test drive was set up the same way with almost no sag with full riding gear (83kg) and it was horrible to drive as it was very unstable and nervous on the steering unlike my Yamaha WR450 I had many years ago that had sag adjusted correctly for 75kg rider. I did buy the KTM 500 and will adjust the sag correctly myself (the 300 2 stroke was to week compared to my old WR450 so I did go for the big bore 4 stroke a, I am a power junky it seems lol :).
Softer Spring will compress more than stiffer one. Here's your theory is reverse. Please explain
After setting rider sag if the free sag is too little it means the spring is too soft and the rider had to crank up the preload too high. And vice versa. So too soft a spring will result in too little free sag after setting the rider sag correctly.
Yeah that is a good way of setting up your bike and a really great video well done 👍
incorrect. A different spring would be needed for inadequate sag with rider on, for sag just for the bike, you need to adjust the preload as in the first example.Because the question is what is the correct spring rate for YOU, and then you just proceed to measure the sag for just the bike, with no consideration for the rider weight. You guys mixed up the two.
and also the part at 1:54.
Turning the lock ring CLOCK WISE (like in your Video...was counter clockwise...) one full turn with the SHARPIE marked is that LESS SAG or rather is that STIFFENING the shock for less SAG? Im at 110-112mm's of Sag now on the bike. I would like to be 105mm's.
From my understanding you should go clockwise to get to 105 which is recomended...
Where did you get that T-handle wrench with the Torx on the ends?
I cant get to my lock ring on my 2020 kawasaki kx450. Is there a way to get to it??
Remove parts 🤣
If free sag is less than 30mm then you'll need a softer spring, not a stiffer one.
lisimahus No... if the spring is too soft the rider cranks down the preload more to get the back end up, resulting in too little static sag when he gets off bike. Too little static sag = spring too soft, need a stiffer one which will require less preload!
Sam Evans exactly so...
@lisimah incorrect. Sams Evans and the video are correct.
Hey guys! After adjusting my preload i noticed that the preload collar isn't against the spring anymore, so when the bike is on the stand, the spring can move up and down, left and right. When i take the bike off the stand, it goes back to normal, because ofcourse the bike's weight is now applying to the rear spring. I know i need a softer spring, i just don't have it right now. But could i run it like this?
No because when you catch air and land it could break something
if parts aren't sitting properly they won't work as intended
Hi I got a 2010 ktm 85cc big wheels I'm having trouble getting the back wheel of the bike the bar in wheel is stuck...can U please help me...
Guys, thanks for the video, it's very useful! But I wanted to deduce the determination for the word sag. is it possible to call a sag a range? Sag as a manufacturer's recommended suspension compression range? A static sag is from 30mm to 40 but its a range, it is a recommended range and for a rider sag also is a recommended range. So is the sag a range first of all?