Does this make the chair taller?

Yes, it makes the chair Taller. The original Herman Miller cylinder sit about 2 inches past the wheel base. The heavy duty cylinder sold here sits taller as it doesn’t go past the base. Hope this helps!

does this come with the bearing already installed

Yes, the bearing installed already, Inside outer tube, thank you!

How can you tell how old the chair is (if it is between 1996 and 2012)?

Check the serial number and or Part numbers on the chair. Call the manufacturer my chair was a Herman Miller chair and they were able to tell me when it was sold to me and that I had a 10-year warranty... S0 the numbers on the chair sometimes indicate MFG year. Good Luck

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🚀 Elevate your workspace with precision power and lasting comfort!

BUILT TO ENDURE - Class 4 gas lift engineered to support up to 350 pounds with unmatched durability.
RISK FREE UPGRADE - Backed by a 5-year replacement warranty for long-term peace of mind.
UNIVERSAL AERON FIT - Compatible with Herman Miller Aeron chairs Size A, B, and C (1996-2012 models).
PRECISION HEIGHT CONTROL - Enjoy seamless 4.5-inch seat adjustment for perfect ergonomic positioning.
CERTIFIED QUALITY ASSURANCE - Exceeds ANSI/BIFMA5.1-2011 standards for trusted safety and performance.

The MingYi.office Class 4 pneumatic gas cylinder is a premium replacement part designed specifically for Herman Miller Aeron chairs made between 1996 and 2012. Featuring a 4.5-inch smooth seat height adjustment stroke, it supports up to 350 pounds and surpasses ANSI/BIFMA5.1-2011 safety standards. With a robust 5-year warranty and compatibility across Aeron sizes A, B, and C, this cylinder ensures reliable, ergonomic performance for your office setup.

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