Winter Suspension Service Checklist: 6 Jobs That Save Your Fork and Shock

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Fall is when suspension quietly gets worse. Dust works into seals. Oil breaks down. Air springs lose their smooth feel a little at a time, so you adapt without noticing. Then spring arrives, the trails dry out, and your fork feels harsh on the first fast descent.

The off season is the cheapest time to fix that. Shops are less booked, you are not missing prime riding days, and most jobs that protect a fork and shock are simple if you do them before wear turns into damage.

1. Start With a Honest Feel Check

Before you order parts, write down what the bike feels like right now. Push down on the fork in the driveway. Does it move smoothly from the first millimeter, or does it stick and then break free. That initial stick is called stiction, and it is the most common sign that lowers service is overdue.

Do the same at the rear. Sit on the bike and bounce gently. Listen for squelching, knocking, or a gritty feel. Check sag while you are there. If you need a refresher on what healthy suspension should feel like, our guide to coil vs air shocks and what trail riders should actually know explains the differences in plain terms. Note your current air pressure, rebound clicks, and compression settings before you change anything. A phone photo of your settings saves guesswork in spring.

What to record

• Fork and shock air pressure, plus your riding weight
• Rebound and compression clicks, counted from fully closed
• Any noises, leaks, or visible oil on stanchions
• Sag percentage front and rear, if you have a helper

2. Do the Fork Lowers Service

A lowers service is the best value job in mountain biking. You drop the lower legs, clean everything, replace foam rings and crush washers, and refill with fresh oil at the correct volume. Most manufacturers call for this every 30 to 50 hours of riding. Many riders go a full season or longer, and that is where stanchion wear starts.

If you have done a lowers service before, plan on about an hour. You need the correct oil weight and volume for your fork model, new foam rings, and a seal kit if the wipers look cracked. If you have never opened a fork, this is still a good first suspension job, but follow the manufacturer service manual step by step and work on a clean towel so small parts do not disappear.

Our earlier September suspension check for signs your fork needs service covers the warning signs in detail. Winter is when you act on them, not just notice them.

3. Inspect Seals, Stanchions, and Bushings

While the lowers are off, look closely. Run a fingernail lightly up each stanchion. It should feel glass smooth. Any nick, scratch, or dull patch will chew through new seals quickly and needs attention from a shop.

Check the wiper seals for cracks and for dirt packed underneath. Check bushing play by reinstalling the lowers without seals and rocking the legs gently. A small amount of movement is normal. A clear knock is not. Bushing work is shop work, and catching it in winter gives a shop time to size and replace them before spring demand spikes.

Replace without debate

• Foam rings that are dark, torn, or dry
• Crush washers every time the lowers come off
• Wiper seals that are cracked or loose on the stanchion
• Oil that comes out black or smells burnt

4. Service the Air Spring and Check the Shock

Air springs collect grease and debris over a season. Cleaning the air can and re-greasing the piston with the manufacturer approved grease restores small bump sensitivity more than most riders expect. Add or remove volume spacers only one at a time, and only if your notes from step one say you were bottoming out or never using full travel.

For the rear shock, a basic air can service follows a similar pattern. Clean, inspect seals, replace the seal kit, and refill to your recorded pressure. Full damper service, where the internal damper oil and nitrogen charge are replaced, is different. Most shocks need it every 100 to 200 hours or once a year, and it requires specialist tools. Book that in winter. Shops turn these jobs around faster now than in April.

Do this while the bike is already in the stand for the broader jobs in our winter bike prep checklist.

5. Torque, Cycle, and Re-Check Sag

Reassembly mistakes cause more winter service problems than worn parts do. Use a torque wrench on axle, brake caliper, and stem bolts. Cycle the fork and shock slowly through full travel before you ride, so fresh oil coats the seals. Then set sag again with riding gear on.

Aim for the manufacturer range for your bike, often around 25 to 30 percent at the rear and 15 to 20 percent at the front for trail bikes. Treat those numbers as a starting point, not a rule. If your notes said the bike dove under braking, add a small amount of pressure or one click of compression and test. Change one thing at a time and write it down.

6. Store It Ready, Not Forgotten

How you store the bike matters. Store it at riding pressure, not fully deflated, so seals keep their shape. Keep it indoors if you can, away from direct heat. Once a month, gently cycle the suspension a few times to move oil across the seals. It takes thirty seconds.

Finally, put a note in your calendar for a spring check. Seals that were borderline in November will not heal by March. A short note with what was done and your pressures will save a full setup session in spring.

The Short Version

You do not need to do everything at once. If time is short, do the lowers service and the feel check. Those two jobs catch most wear and cost the least. Book the damper service if hours are high or the shock makes noise. Riders who use winter this way start spring on a bike that feels new. Riders who skip it spend spring chasing a harsh fork that was telling them the truth all fall.

FAQ

How often should I service my mountain bike fork lowers?

Most manufacturers recommend a lowers service every 30 to 50 hours of riding. If you ride weekly, that means at least twice a season. Winter is an ideal time because you are not losing riding days.

Can I do a full damper service at home?

Most riders should leave full damper service to a shop. It needs specialist tools, correct damper oil, and often a nitrogen charge. Lowers service and air can service are the home friendly jobs.

Should I store my bike with suspension pressure lowered?

No. Store the bike at your normal riding pressure so seals keep their shape. Cycle the fork and shock gently once a month to keep seals lubricated.

BikeTrekker Team

Our team at BikeTrekker.com consists of passionate cyclists, experienced trail riders, and dedicated outdoor enthusiasts committed to providing you with the most accurate and inspiring content. Read full bio