Does this sound familiar? Your chair won't straighten, the backrest is stuck, you can't find the right adjustment lever – or the mechanism is so stiff you can't even lean back. This guide shows you quick and easy solutions – without any technical jargon – so you can be sitting comfortably in an ergonomic chair within minutes.
Release the locking mechanism, engage the correct lever, and slowly recline the backrest while seated. Then, adjust the spring tension using the large knob under the seat so that the backrest yields evenly. If the mechanism doesn't engage, the locking mechanism is usually engaged or the spring is too tight.
Quick guide (how-to)
Release the lock
Look for a lock symbol: open = unlocked. The locking lever is usually located on the right under the seat.
Finding the right lever
Tilting mechanism: a lever tilts the seat and backrest together.
Synchronous mechanism: lever plus rotary knob; the backrest moves further than the seat.
Test while seated
Sit upright and lean back slowly until the mechanism engages. Do not try this while standing.
Adjusting spring tension
Large rotary knob under the seat:
– too hard → counter-clockwise (softer)
– too soft → clockwise (harder)
Fix angle (optional)
For working, a backrest angle of 90–110° is recommended. If desired, close the locking mechanism again.
Ergonomics tip: Position the top of the monitor at approximately eye level, feet flat on the floor, and change position every 30-45 minutes.
Backrest angles: 110°, 120°, 130° – which angle is for what?
Summary: Focused work 100–110°, relaxed and productive 110–120°, short breaks 120–130°. Dynamic sitting is important instead of a single fixed position.
110° – active & back-friendly
Good for typing and video calls. Relieves pressure on the intervertebral discs compared to 90°, but keeps you alert.
Practical tip: Forearms fully on the armrests; if necessary, adjust the monitor slightly closer or higher.
120° – relaxed and productive
Ideal for reading, brainstorming, and longer meetings. Noticeable pressure relief in the back and hips.
Practical tip: Briefly move the mouse/keyboard to the side, relax your shoulders, and deepen your breathing.
130° – short regeneration
For breaks, phone calls without typing, eye relief. Reduces tension, promotes blood circulation.
Practical advice: Don't work like this permanently; otherwise, your gaze towards the monitor will become too shallow.
Example (three stages as in models like Sihoo Doro C300 ):
These chairs often offer three locking positions for the backrest. You unlock the lock, lean back to 110° (focus), 120° (reading/ideas), or 130° (micro-break), and then lock it again. This allows you to quickly switch between "active," "relaxed," and "break" positions throughout the day.
Everyday check:
Adjust the armrests so that your shoulders remain relaxed. At 120–130°, tilt the monitor slightly or pull it closer. If the armrest "catapults away" or "snaps back": fine-tune the spring tension until the movement is smooth and even.
Troubleshooting (Quick Fix)
The backrest doesn't move at all?
Release the locking mechanism and test while seated (some lower parts only unlock under load).
Too hard or too soft.
Adjust spring force in 1-2 turns, then test again.
One-sided tilting or cracking?
Tighten the screws on the lower part and check for visible damage. If the seat sags: check/replace the gas spring .
Can't find a lever?
Use a flashlight to look under the seat on the right and left sides; on gaming chairs, the locking lever is often located on the side.
Safety: Never let it "fall backwards" when empty. Test slowly; keep children away.
Types of mechanics explained briefly
- Tilt mechanism: Seat and backrest tilt together. Robust, simple, good for short changes of posture.
- Synchronous mechanism: The backrest moves relatively farther than the seat. Relieves pressure on the back and pelvis – recommended for prolonged sitting.
- Terms: Locking mechanism, gas spring (height adjustment), spring force (return stiffness).
FAQs
Why doesn't my office chair recline?
Most likely the locking mechanism is engaged or the spring is too tight. Unlock it, loosen the spring tension, and test it while seated.
How do I adjust the spring force correctly?
So that you can lean back without any effort and the backrest gently guides you back – neither "rushing through" nor rock hard.
Rocking or synchronous mechanism – which is better?
For long periods of screen work, a synchronous mechanism is usually preferred; a rocker mechanism is simpler, but offers less precise support.
What angle is ideal for working?
Typically 90–110°. Slightly more for reading/thinking; frequent changes are more important than the exact angle.
