How to Set Up Dirt Bike Suspension: Sag, Clickers & Springs (2026)

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Suspension is the part of a dirt bike that most riders never touch and that makes the biggest difference to how the bike handles, how fast it is, and how tired you get. A bike set up for someone else's weight and speed will fight you all day - it will deflect off square edges, kick on braking bumps, dive in corners, or feel vague and wallowy. The good news is that the most important adjustments cost nothing but a few minutes and a tape measure, and the rest are dials that are already on your bike. This guide covers the order to do it in: sag first, then check your spring rate, then the clickers, then fork height.

Start with sag - it is free and it matters most

Sag is how much the suspension compresses under weight, and setting it is the single most valuable thing you can do. There are two measurements and you need a helper and a tape measure (a dedicated sag scale makes it faster but a tape works fine).

• Race sag (rider sag) is measured with you on the bike in full gear, feet on the pegs, balanced upright. It is the difference between the suspension fully extended (rear wheel off the ground) and the bike with you on it, measured from the rear axle straight up to a fixed point on the rear fender. For a full-size motocross bike the usual target is about 100mm (most riders land in the 95-105mm range; the bike's manual gives the exact figure).
• Static sag (free sag) is the same measurement with the bike's own weight only - no rider. The usual target is roughly 30-40mm.

Set race sag first by adjusting the rear shock spring preload (loosen the lock ring and turn the adjuster collar) until you hit the number. A long-handled spanner wrench or punch makes turning the lock rings far easier than a hammer and screwdriver.

Now check your spring rate - sag can't fix the wrong spring

Here is the part most people miss. Once race sag is correct, check static sag. The relationship between the two tells you whether your springs actually match your weight:

• Static sag is too little (well under 30mm) after setting race sag: your spring is too soft, and you have cranked in a lot of preload to compensate. A heavier rider on stock springs usually sees this.
• Static sag is too much (well over 40mm): your spring is too stiff for you, and you needed almost no preload. A lighter rider or a kid on an adult bike often sees this.

Preload changes ride height, not spring rate - so if the spring is wrong, no amount of sag adjustment makes the bike work, and you will chase clickers forever trying to fix a spring problem. Stock springs are valved for a rider around 160-175 lb; if you are well outside that, the highest-value upgrade on the whole bike is a correct-rate fork and shock spring set for your weight. Match both ends - a soft fork with a stiff shock (or the reverse) makes the bike pitch and deflect.

The clickers: compression and rebound

Your forks and shock have small screws (usually turned with a flat blade or a dedicated clicker tool) that meter oil flow. Set every clicker to the manufacturer's baseline first: turn it gently all the way in (clockwise) counting the clicks, then back out the number of clicks the manual specifies. Write those baseline numbers down. Then change one clicker, one or two clicks, in one direction at a time and ride - if you turn five dials at once you learn nothing.

• Compression controls how the suspension resists compressing. Too stiff and the bike feels harsh and deflects off square-edged bumps and braking chop; too soft and it dives and bottoms hard on landings and hard hits.
• Rebound controls how fast the suspension returns after compressing. Too slow ("packing") and the suspension does not recover between hits, so it rides lower and lower through chop and feels harsh; too fast and the bike kicks, feels springy, and can headshake.

A simple field test for rebound: push down hard on the seat or bars and let go - it should return to position promptly without launching back up past static. Make small changes, note them, and only chase one symptom at a time.

Fork height: the free handling adjustment

How far the fork tubes stick up through the top triple clamp changes the bike's balance. Sliding the forks up in the clamps (more tube showing) quickens the steering and helps the front bite in corners, but too much invites headshake. Dropping the forks down (less tube showing) makes the bike more stable and planted at speed but lazier to turn. Move in small steps - 2 to 4mm - and keep the front and rear balanced. If you set sag and the bike still pushes in corners or shakes on straights, fork height is often the fix, and it costs nothing but a few minutes with a T-handle wrench set on the clamp bolts.

A quick travel check with a zip tie

Slide a zip tie around a fork tube and push it down against the seal. After a session it shows how much fork travel you actually used. If it never gets within an inch or two of full travel, you are too stiff or too high on oil for the track; if it bottoms hard every lap, you are too soft or need more oil height. It is the cheapest data you can get on what your suspension is doing.

When it is time for a service, not a click

Clickers and sag only work on oil and seals that are in good shape. Suspension fluid breaks down and seals wear, and a tired fork feels harsh and vague no matter how you set the dials - if the bike used to feel good at these settings and now does not, it is due. Fork oil height (the air gap) tunes how the fork behaves deep in the stroke and is changed during a service with fresh fork oil; rear shocks are nitrogen-charged and re-valved by a suspension shop, not adjusted with a hand pump. A basic fork seal and oil change is a reasonable home job with fork seal tools; full revalving is shop work. For the rest of the keep-it-running schedule, see our dirt bike maintenance guide.

Common mistakes

• Chasing clickers to fix a spring problem. If static and race sag can't both be in range, your spring rate is wrong - fix that first.
• Changing several things at once. One clicker, one or two clicks, one direction, then ride. Otherwise you never know what did what.
• Ignoring rider weight. Stock springs suit a mid-weight adult; a heavy rider or a light kid needs different springs, not just more or less preload.
• Setting the front and rear independently. A balanced bike turns and tracks; a stiff end and a soft end makes it pitch and deflect.
• Never writing baselines down. Record your clicker counts and sag numbers so you can always return to a known-good starting point.

The short kit

To do all of this you need very little: a tape measure (or a sag scale), a spanner wrench for the shock lock rings, a clicker tool, a T-handle set for the clamps, and a zip tie for the travel check. Springs and a proper service come later if your weight or a tired fork calls for them. Sag and clickers alone, set patiently, transform how almost any bike rides.

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