Office Chair Mechanisms Explained

If you’re looking for a new office chair the many different mechanisms and features can be sometimes confusing…

Check out our list of common office chair features below to help choose the mechanism that is best for you!

Synchro mechanism – this is where the seat and back are synchronised to move together, so the angle between the seat and the back is always the same, this can be left to ‘free-float’ or locked at a specific angle.

Back rake mechanism – here the seat is fixed but the back angle can be adjusted and locked in the required position.

Independent mechanism – this mechanism has a permanent contact back with independent seat angle adjustment and is also lockable in various positions.

Pelvic support principle mechanism – an advanced ergonomic concept: research suggests that an ergonomic chair with effective pelvic support generally prevents back problems.

Knee tilt mechanism – where the front of the seat tilts forward to reduce pressure on the back of the knees.

Seat slide – a seat slide is often available as an extra option, this adjusts the depth of the seat to accommodate different sized users.

Inflatable lumbar support – also available as an extra on most chairs, this adjusts the lower back support and can be used to help back problems.

Tension or body-weight adjustment – where a chair is used in ‘free-float’ mode the tension can be adjusted to suit your body weight to prevent the user unintentionally tilting too far back or forwards.

Ratchet back – the back moves up or down on a  ratchet to adjust the back support to suit the height of the user.

Still not sure?  Speak to our helpful sales team at our Middlesbrough office for help! 0800 342 3179

To discuss your boardroom with our team today, give us a call on 0800 342 3179 and email us at