Compare synchro-tilt, centre-tilt, knee-tilt, back-angle adjustment, forward tilt, tension controls, and lock positions.
The mechanism controls movement
The mechanism under the seat determines how the seat and backrest move together. It affects foot contact, pressure distribution, reach to the desk, and how natural posture changes feel.
Marketing labels are not standardized across every brand, so study the movement diagram and user manual.
Common mechanisms
Centre-tilt pivots near the centre of the seat. Knee-tilt moves the pivot forward, which can help keep the front of the seat from rising as much. Synchro-tilt changes the seat and back angles at different rates.
A multi-function mechanism may allow separate seat and back angles. Forward tilt can support some close visual tasks but requires careful adjustment.
Controls to compare
Look for an accessible tension control, intuitive locks, a safe recline range, and a mechanism that does not pinch fingers or catch clothing.
Shared chairs benefit from controls that are easy to identify without a manual.
Durability and service
Mechanisms carry repeated loads and moving parts can loosen. Check warranty coverage, replacement availability, and whether the chair has been tested to a recognized seating standard.
Questions to ask before deciding
- Does the published range fit the user and desk?
- Can the controls be reached and understood during normal work?
- Do armrests, base, and recline fit the room?
- What testing, warranty, parts, and return evidence is available?
- Can the chair be tried with realistic tasks?