SIHOO M18 vs Steelcase Series 1

Side by side from official specifications, sourced prices and User Insights. No written comparison exists for this pair yet.

SIHOO

SIHOO M18

$289.99 – $299.99

Steelcase

Steelcase Series 1

$549 – $750

$259.01

lower starting price for SIHOO M18 than Steelcase Series 1 at the brand stores

Differences at a glance

SIHOO M18Steelcase Series 1

Price: $289.99 – $299.99$549 – $750
Seat height: 44–54 cm16.5–21.5 in (41.9-54.6 cm); 14.75–17.75 in (37.5-45.1 cm); 17.25–22 in (43.8-55.9 cm)
Seat depth: 17.91 in (≈ 45.5 cm)15.5"D to 17.75"D (functional seat depth)
Load capacity: 330 lb (≈ 150 kg)400 lb (181.4 kg); 300 lb (136.1 kg)
Recline: Maximum 126° recline angleWeight-activated synchro tilt; comfort dial with upright back lock, boost setting and weight-activated full recline
Arms: Adjustable armrests (Up and down)4D arms (standard), height-adjustable arms or armless
Headrest: Headrest moves 3.9" up and down and pivots 45°Optional headrest; adjusts 3.25" vertically
Lumbar support: Lumbar support adjusts vertically and horizontallyAdjustable lumbar is standard; fixed lumbar is available (3D Microknit Back only)
Warranty: 3 yearsLimited Lifetime Warranty; 12-year, multi-shift, 24/7 parts and labor

From 5 SIHOO M18 and 5 Steelcase Series 1 user reviews, most mentioned first. Green is liked, orange is a caution.

Which is cheaper, the SIHOO M18 or the Steelcase Series 1?

The SIHOO M18 is cheaper to start: $289.99 versus $549 for the Steelcase Series 1 at the brand stores (Oct 2026).

Which has a headrest?

Both: the SIHOO M18 as standard and the Steelcase Series 1 as an option.

What do owners mention most?

Price and value for the SIHOO M18, and adjustability for the Steelcase Series 1, based on review summaries.