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 power and precision!

BUILT TO LAST - Class 4 gas lift exceeding ANSI/BIFMA5.1-2011 standards ensures durability under heavy use.
HEAVYWEIGHT SUPPORT - Supports up to 350 pounds, empowering you to work comfortably without compromise.
WORRY FREE WARRANTY - Backed by a 5-year replacement warranty, guaranteeing long-term peace of mind.
UNIVERSAL FIT FOR AERON - Compatible with Size A, B, and C models from 1996-2012, making replacement seamless.
PRECISION HEIGHT CONTROL - Effortlessly adjust your Aeron chair with a 4.5" stroke for perfect ergonomic positioning.

The MingYi.office Heavy Duty Class 4 pneumatic gas cylinder is a premium replacement part designed specifically for Herman Miller Classic Aeron chairs (sizes A, B, and C) manufactured between 1996-2012. Featuring a 4.5" seat height adjustment stroke, a robust 350-pound load capacity, and compliance with ANSI/BIFMA5.1-2011 standards, this cylinder ensures smooth, reliable performance. Its durable construction and 5-year warranty make it the ultimate upgrade for professionals seeking ergonomic excellence and lasting quality.

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