Adjusting an office chair’s back tilt comes down to a tension knob and, on many models, a lock lever that sets the recline angle.
Most office chairs let you control the backrest recline with two separate controls: a tilt tension knob that changes how much effort it takes to lean back, and a tilt lock or limiter lever that sets how far the chair will recline. Getting both set correctly takes about a minute and turns a stiff or wobbly chair into one that supports you properly.
Where The Tilt Controls Live On Your Chair
The tension knob is usually a round dial under the front of the seat or on the lower right side. The limiter lever is typically a paddle or bar under the seat or on the lower left side.
On the Herman Miller Aeron Classic, the tilt tension knob sits under the seat, and the limiter lever is on the left side. The Mirra places the tension knob on the lower right side and the limiter on the left. The Embody uses a back angle control on the left and a tilt handle underneath. Steelcase models like the Reply put the tension handle under the seat with the lock lever nearby. Check your specific model’s controls before turning anything.
How To Change The Recline Resistance
The tension knob controls how much force the backrest resists.
Here’s the correct sequence for adjusting tension:
- Sit in the chair and take most of your weight off the backrest. The manuals explicitly caution against adjusting tension while leaning heavily on the back.
- Reach under the seat to find the tension knob. On Aeron Classic and Mirra, it’s on the lower right side.
- Turn the knob clockwise to increase resistance, or counterclockwise to decrease it. Make small quarter-turn adjustments.
- Test the recline by leaning back gradually. The backrest should move smoothly with controlled resistance, neither snapping back nor requiring a hard push to move.
- Readjust until the motion feels balanced. A good starting point is where you can recline comfortably without feeling pushed forward.
Setting The Recline Limit With The Tilt Lock
The limiter or lock lever controls how far the chair reclines, which is separate from resistance. Tension changes the effort; the limiter sets the stopping point.
Common Tilt Adjustment Mistakes To Avoid
The first mistake is adjusting tension while leaning heavily on the backrest, which the manuals warn against and which makes the knob hard to turn accurately. The second is confusing tension with the limiter: if the chair won’t recline past a point, check the limiter, not the tension knob.
If your chair is already comfortable but you’re looking to upgrade, our roundup of chairs for lower back support covers tested models worth considering. For the chair you have now, though, a minute of adjustment is usually all it takes.
References & Sources
- Herman Miller. “Classic Aeron Chairs Adjustment Guide.” Details tension knob direction and limiter lever positions for the Aeron Classic.
- Herman Miller. “Chair Adjustments.” Herman Miller’s official hub for model-specific adjustment instructions across its chair lineup.
FAQs
Why does my office chair lean back too easily?
Your tilt tension is set too low. Sit with your weight off the backrest, then turn the tension knob clockwise or forward to increase resistance. Make small quarter-turn adjustments and test until it feels controlled and supportive.
How do I stop my chair from reclining too far?
Use the tilt limiter or lock lever, not the tension knob. Recline to the position you want as your maximum, then move the lever up or into the lock position to set the limit. The chair will stop at that angle instead of going all the way back.
What’s the difference between tilt tension and tilt lock?
Tilt tension controls how much effort it takes to recline, like resistance on an exercise machine. The tilt lock or limiter controls how far the chair will recline before stopping. You adjust one for feel and the other for range.