Steelcase Series 1 vs SIHOO M18

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

Steelcase

Steelcase Series 1

$549 – $750

SIHOO

SIHOO M18

$289.99 – $299.99

$259.01

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

Differences at a glance

Steelcase Series 1SIHOO M18

Price: $549 – $750$289.99 – $299.99
Seat height: 16.5–21.5 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)44–54 cm
Seat depth: 15.5"D to 17.75"D (functional seat depth)17.91 in (≈ 45.5 cm)
Load capacity: 400 lb (181.4 kg); 300 lb (136.1 kg)330 lb (≈ 150 kg)
Recline: Weight-activated synchro tilt; comfort dial with upright back lock, boost setting and weight-activated full reclineMaximum 126° recline angle
Arms: 4D arms (standard), height-adjustable arms or armlessAdjustable armrests (Up and down)
Headrest: Optional headrest; adjusts 3.25" verticallyHeadrest moves 3.9" up and down and pivots 45°
Lumbar support: Adjustable lumbar is standard; fixed lumbar is available (3D Microknit Back only)Lumbar support adjusts vertically and horizontally
Warranty: Limited Lifetime Warranty; 12-year, multi-shift, 24/7 parts and labor3 years

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

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

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

Which has a headrest?

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

What do owners mention most?

Adjustability for the Steelcase Series 1, and price and value for the SIHOO M18, based on review summaries.