Sihoo M18 Ergonomic Office Chair with Headrest, Black vs Steelcase Leap Office Chair, Onyx
These are side-by-side facts taken from each product guide: published specifications, strengths and caveats as their sources state them. This page is not a test, a ranking or a verdict about which model is better.
Sihoo M18 Ergonomic Office Chair with Headrest, Black
A padded seat with a mesh back at a 17 to 21 inch seat height
The M18 pairs a padded W-shaped seat with a mesh back, a sliding two-way lumbar support and a height-adjustable headrest. Sihoo rates it to 330 pounds. The armrests move up and down only, and the sheet in the box mentions a one-year warranty where the listing promises three.
Published specifications
- Maker page: 28 W x 27 D x 44-51 in high, 37.1 lb, 330 lb maximum load
- Listing chart: seat 51 cm (20 in) wide, seat height 44-54 cm (17-21 in)
- Maker page: seat depth 17.91 in, maximum hip width 20.08 in
- Armrests adjust up and down only; headrest moves 3.9 in and pivots 45 degrees
- Manual: six functions, eight assembly steps, hex wrench and spare screws included
- Warranty: manual mentions one year, listing and maker page say three years
Strengths
- Sihoo publishes an exact-model installation guide and a matching product page
- Lumbar support adjusts both up and down and in and out
- Six separate adjustments, assembled with one included hex wrench
Caveats
- The guide in the box mentions a one-year term while the listing promises three years
- Armrests have no width, depth or pivot movement at all
- Listing model number field names a different Sihoo product entirely
Read the full Sihoo M18 Ergonomic Office Chair with Headrest, Black guide
Steelcase Leap Office Chair, Onyx
People who want separate upper-back tension and lower-back firmness controls
Leap pairs a recline-tension knob with a separate lower-back firmness knob and a five-position recline paddle. Steelcase rates it to 400 pounds. The listing's size fields disagree with each other, and the retail warranty depends on buying from a seller Steelcase counts as authorised.
Published specifications
- Listing: model Leap, part number 46216179, five UPCs
- Hang tag: seat height, back-stop paddle, upper back force, lower back firmness
- Hang tag: arms, headrest, lumbar and seat depth marked optional
- Maker page: Natural Glide System; four recline stops plus upright lock
- Maker page and listing: chair rated to 400 lb
- Maker page: 12-year 24/7 multi-shift warranty; retail buyers fall under a consumer warranty
Strengths
- Separate knobs for recline tension and lower-back firmness
- Adjustment labels in English and Braille, per Steelcase's page
- Steelcase and the listing agree on a 400 lb rating
Caveats
- Listing gives three different overall sizes and no maker dimensions were confirmed
- Onyx colour and part number are not confirmed by any Steelcase document we read
- Warranty depends on buying from a seller Steelcase counts as authorised
How to choose between them
Choose the Sihoo M18 Ergonomic Office Chair with Headrest, Black if your situation matches: A padded seat with a mesh back at a 17 to 21 inch seat height. Its main caveat: The guide in the box mentions a one-year term while the listing promises three years.
Choose the Steelcase Leap Office Chair, Onyx if your situation matches: People who want separate upper-back tension and lower-back firmness controls. Its main caveat: Listing gives three different overall sizes and no maker dimensions were confirmed.
Both entries repeat what each guide records. Confirm the model, included parts and availability on the current listing before ordering.
Primary sources
- Sihoo product installation guide naming Model M18 (maker PDF supplied on the listing) Source for Sihoo M18 Ergonomic Office Chair with Headrest, Black
- Sihoo US store product page for the M18 ergonomic chair Source for Sihoo M18 Ergonomic Office Chair with Headrest, Black
- Steelcase Leap product page Source for Steelcase Leap Office Chair, Onyx
- Steelcase Leap hang tag with adjustment instructions, part 93-9546202 (maker PDF on the listing) Source for Steelcase Leap Office Chair, Onyx
- Steelcase Limited Lifetime Warranty for the Americas, updated June 2026 Source for Steelcase Leap Office Chair, Onyx
- Steelcase store FAQs, including the consumer warranty answer Source for Steelcase Leap Office Chair, Onyx
Primary sources checked .