The Office Master YS78 is a high-back mesh task chair built around a synchronous recline. The seat and back move together, while a seat slider and tension adjustment provide useful ways to refine the fit and feel.
It is worth comparing when you want a taller mesh back and coordinated movement without a headrest. The standard YS78 does not use the same independent-angle mechanism as the YS72 or the full multi-function control of the YS88.
Current YS78 specifications
| Item | Standard specification in OM Seating's 2026 pricebook |
|---|---|
| Back | Approximately 20 inches wide by 24 inches high; mesh |
| Seat | Approximately 20.5 inches wide |
| Seat depth | Approximately 18–20 inches |
| Seat height | Approximately 17.5–22.5 inches |
| Overall width | Approximately 27 inches |
| Mechanism | Management Synchro (-1), with three-stage locking tilt |
| Standard listed capacity | 300 lb in the 2026 pricebook |
Dimensions are approximate and describe the standard configuration. Alternate cylinders, arms, and casters can change the final chair. The current model-specific pricebook is a better reference than an older general family description; confirm any load or usage requirement against the selected components.
How synchronous recline feels
The synchronous mechanism coordinates the seat and back as you lean. The two surfaces do not travel through identical angles. This offers a different experience from choosing and locking their angles independently.
For someone who likes one linked recline motion, that can be an appealing arrangement. Someone who wants to set the seat and back separately may prefer a different mechanism.
The recline does not guarantee that every user's feet remain flat throughout its travel. Seat height, leg length, foot support, and the task still affect the working position.
Three locking stages and adjustable resistance
The three-stage tilt lock offers defined positions within the recline range. Free movement and a locked position serve different purposes: one allows changes in position, while the other holds the available angle.
Tension adjustment changes how readily the mechanism yields when you lean back. A useful setting feels manageable in both directions. The control's operating sequence should come from the instructions for the mechanism actually fitted to the chair.
A lock does not make one reclined position ideal for every task. Typing, reading, and a phone call may feel better with different support.
The seat slider and height range
The seat's approximate 18–20-inch depth range lets you change its relationship with the backrest. That can help balance thigh support with clearance behind the knees.
The shortest setting is still a meaningful measurement. A smaller user who cannot sit against the back without pressure behind the knees may need a shorter-depth model. A taller user who wants considerably more seat depth may need a different seat platform.
The standard seat-height range in the current pricebook is about 17.5–22.5 inches. Other cylinder choices should be compared by their actual resulting seat-height range, rather than assuming an older low-cylinder figure applies to every YS78.
A high mesh back without a standard headrest
The taller mesh back offers contact behind more of the torso than a mid-back design. Mesh also allows air movement through the back surface, although room conditions and individual preferences affect how cool a chair feels.
The YS79 is the related synchronous model with a headrest. The YS88 offers a high mesh back with a full multi-function mechanism, and the YS89 combines that mechanism style with a headrest.
Those differences make the Yes range more useful than a simple ladder of increasingly expensive chairs. The preferred movement style and the need for head support can lead to different choices.
Arms, upholstery, and assembly
The selected arms need to match both the user and the desk. Their height, spacing, and pad position matter more than how elaborate they look. A product photograph may show arms that are separate options on the configured listing.
Available seat fabrics change appearance, feel, cleaning requirements, and price. Any alternate mesh or upholstery choice should be confirmed on the current listing.
For assembly, use the manufacturer's Yes-series assembly instructions supplied for the configuration. Generic advice about leaving all fasteners loose until the end does not replace the specified sequence. The chair should be fully assembled and secure before use.
Who should compare the YS78?
The YS78 belongs on a shortlist when its seat range fits, you prefer a tall mesh back, and a synchronous recline suits your work. It may be less suitable if you need a much shorter seat, an oversized deeper platform, or independent seat-angle positioning.
The current YS78 product page shows available configurations and pricing. Warranty coverage is limited and component-specific; the manufacturer's current terms determine what is covered.
