Wilkhahn ON

Overview

The Wilkhahn ON launched in 2009 with a singular mission: to pioneer three-dimensionally supported sitting thanks to a new type of synchronously supporting 3-D kinematics called Trimension® . Rather than constrain movement to the familiar forward-and-back tilt, the ON allows the pelvis to flex, extend, shift sideways, and rotate—the full natural range your hip joints are built for. At the core of the concept lies Trimension®, two separately moveable swing plates that follow the natural movement of the pelvis, hips and knee joints . More than a decade after its debut, the ON remains a benchmark for dynamic seating in executive and 24-hour environments, a chair that challenged ergonomic orthodoxy and won.

At a glance

The brand & its philosophy

Wilkhahn (Wilkening + Hahne GmbH+Co.KG), based in Bad Münder, Lower Saxony, was founded in 1907 by Friedrich Hahne and Christian Wilkening; the portmanteau name "Wilkhahn" was adopted in 1954 . For more than a century the company has built an international reputation for ergonomic office seating and an early commitment to both design discipline and environmental responsibility. Wilkhahn became a pioneer of German industrial design, experimenting with new materials and evolving its own distinct design; this resulted in purist furniture, the form of which was developed in strict adherence to function .

In 1989, Wilkhahn's supervisory board made the ground-breaking resolution that, if in doubt, ecology and social responsibility were to be valued more highly than a quick profit . That commitment is more than rhetoric: all Wilkhahn sites comply with one environmental management system that has EMAS validation and ISO 14001 certification at the Bad Münder headquarters, and the main production site and all European sales sites have ISO 9001 certification . The ON embodies this philosophy—engineered for longevity, repairable construction, and materials chosen for durability and low environmental impact.

The designer and the design story

The ON was designed by wiege , a German design group with a track record in industrial and product design. Little public information about the individual designers is widely available, but the design brief was clear: create a chair that would translate decades of Wilkhahn's ergonomic research—particularly the Trimension® kinematic concept—into a high-quality, visually confident task chair suitable for executive and 24-hour use. Wilkhahn's earlier FS-Line, developed by Klaus Frank and Werner Sauer in 1980, marked the consistent implementation of the principle of dynamic sitting, with more than 2 million chairs sold . The ON takes that legacy into three dimensions.

Development was exhaustive: the goal was not simply to permit lateral tilt but to support pelvic rotation in any direction while maintaining the body's center of gravity. The result is a chair that feels intuitive to use yet represents a significant leap in biomechanical sophistication.

Design language & aesthetics

The design is first class: high quality, spacious and appealing, the ON immediately conveys a sense of ease, value and comfort . The visual language is clean and functional—no sculptural flourishes for their own sake—but the proportions are generous and the fit and finish unmistakably premium. Two backrest heights are offered: medium (W 69 × D 66 × H 97–109 cm, seat height 40–52 cm) and high (W 70 × D 66 × H 105–117 cm) ; the high-back version is available with an optional headrest.

The five-armed base is offered in black through-dyed plastic or die-cast aluminium, in black, silver silk matt, polished, or bright chrome-plated finishes . The upholstery palette ranges from technical Fiberflex mesh to wool-blend fabrics and full leather for the management-grade models, some with contrast double seams. The overall impression is executive-calibre: substantial, solid, and confident without ostentation.

Ergonomics & how it supports the body

In today's busy office environment we all spend long periods hunched at our desks; bizarrely, despite being bad for our bodies we choose to adopt a lazy posture, yet what the human body actually requires is frequent and varied movement. Wilkhahn understands this key principal of ergonomics, which is why the company developed Trimension® for the ON . Trimension® is patented technology for three-dimensional, synchro-adjusted dynamic seating that doesn't just encourage forwards, backwards and sideways movements, but pelvic rotation too—so important for the spine's stability .

Minimal changes in weight are converted into movement; the position of the key points and the way they work are exactly like the knee and hip joints, so that the body remains in perfect balance no matter what posture is adopted or how it moves . The three-dimensional movements activate the entire back without tiring the body . The result is a chair that supports every micro-shift in posture rather than constraining the sitter to a narrow range of approved positions.

Key adjustments & mechanisms

Task chairs with Trimension® use synchronous, three-dimensional kinematics to encourage dynamic sitting; the perfect interaction of the synchro-adjustment mechanism, seat and backrest automatically adapts to any posture the user adopts . The supporting counter pressure is quickly and precisely adjustable in any direction (4.5 rotations maximum) for people weighing from 45 to 120 kg .

The backrest height is adjustable by up to 60 mm in six lockable positions . The backrest and seat can be locked in the front sitting position . The seating height is precision adjustable between 40 and 52 cm at the touch of a button with a DIN 4550-compliant gas lift . All models are optionally available with seat-depth extension from 40 to 45 cm . 3D armrests are made of glass-fibre-reinforced black polyamide, adjustable in height by 10 cm (eight grid positions), in depth by 4 cm, and swivelled inwards and outwards by 30 degrees each; armrest pads are available in polyamide or optional leather . The controls are intentionally simple: by pressing just two buttons to rapidly adjust the counter pressure, the ON is ready to go .

Materials & build quality

The seat shell is highly elastic and flexibly suspended, with a seat upholstery panel made of black, through-dyed polypropylene and polyurethane seat cushioning covered in the same material as the backrest cover—Fiberflex or fabric . The seat is replaceable , a testament to Wilkhahn's commitment to repairability and longevity. All models are optionally available with soft padding (extra cut foam and side facings); in models with management-grade upholstery, seat cushioning comes with extra padding and side facings, optionally covered in leather too .

The elastic backrest frame, height adjustable by 60 mm in six lockable positions, is made of through-dyed, fiberglass-reinforced polyamide covered with Fiberflex or fabric (with optional extra padding); for management-grade models, the backrest optionally includes back cushioning and concealed cut foam fleece sewn into the cover, optionally with leather . All 24-hour chairs have a die-cast aluminum star base with extra swivel arm supports and a modified synchro-adjustment mechanism, plus exceptionally hard-wearing covers from Wilkhahn's fabric and leather collection . The overall build is robust and unmistakably engineered for institutional use.

Sitting experience—what it actually feels like day to day

The chair is exquisitely made, very sturdy and very comfortable to sit on , according to one owner review. The defining characteristic is movement: settle into the ON and any shift in weight—leaning left to reach a file, rotating to speak to a colleague, rocking forward over the keyboard—is met with immediate, fluid support. What's distinctive about this chair is that it can rock sideways as well as back and forth, and you can adjust the level of ease of movement; you get a broader range of movement compared to nearly any other office chair .

For sitters accustomed to static chairs, the first few hours can feel unfamiliar—there is no single "locked" position of maximum support. Instead, the ON encourages continuous micro-movement. Over days and weeks that constant dynamic engagement becomes second nature. One owner who has had the chair for two years reports "it's great" . The ON does not fatigue; it energizes.

Who it's for (and who should skip it)

The Wilkhahn ON is designed for:

• Executives and senior staff who spend eight-plus hours a day at a desk and demand the highest level of ergonomic support and build quality.
• 24-hour environments—call centres, control rooms, shift work—where the 24-hour models are designed for people weighing up to 120 kg and comply with DIN EN 1335 standard requirements .
• Anyone recovering from or managing back pain who benefits from dynamic, three-dimensional pelvic movement rather than static "correct posture."
• Organizations with a sustainability mandate who value German engineering, long product life, and third-party environmental certifications.

Who should look elsewhere:

• Budget-conscious buyers: the ON commands a premium price well above mainstream ergonomic chairs.
• Those who prefer a locked, stable chair: if you dislike lateral tilt or find dynamic mechanisms distracting, the ON's core philosophy will frustrate rather than delight.
• Petite or very tall users at the extremes: the weight range is 45–120 kg , and the seat-height range of 40–52 cm may not suit all statures.

Comparisons with key rivals

Within the Wilkhahn family, the ON sits at the top: most refined finish, widest configuration options, strongest 24-hour credentials. The Wilkhahn brand has been synonymous with a superior level of quality, sitting tidily in its own elite niche in the task chair division, starting with the classic ON chair, and then the sporty IN .

Sizing, fit & configuration options

Two backrest heights are available: medium (W 69 × D 66 × H 97–109 cm, seat height 40–52 cm) and high (W 70 × D 66 × H 105–117 cm) ; a headrest is only available in the high back version and is made of the same material as the backrest cover . Seat-depth extension from 400 to 450 mm is optional on all types with upholstery .

The ON range includes numerous model numbers (170, 171, 174, 175 series) that denote upholstery grade, base material, and functional variants. Standard upholstery is Fiberflex (a technical knit) or a range of wool-blend fabrics; management-grade models (174/71, 175/71, 171/71) feature extra padding and optional leather covers on both seat and backrest . Castors are available for either hard floors or carpet . Comprehensive COM (customer's own material) programs are supported for contract specifications.

Sustainability & certifications

The ON task chairs comply with the type A or B DIN EN 1335 office-chair, ANSI/BIFMA X5.1, and IGR standards ; NPR 1813 models (the Dutch ergonomics standard) are available on request. All Wilkhahn sites comply with one environmental management system that has EMAS validation and ISO 14001 certification at the Bad Münder headquarters; the main production site and all European sales sites have ISO 9001 certification . FSC® product-chain certification since 2013 ensures transparency when sourcing wood from responsible forest management .

Wilkhahn has achieved fully climate-neutral electricity consumption since 2021 and reduced its carbon footprint from 4,000 to 1,000 metric tons annually . Materials are chosen for durability and low emissions: metals are exclusively made of recycled material , and the seat is replaceable , enabling long service life and component-level repair rather than whole-chair disposal. Wilkhahn's corporate ethos— "if in doubt, ecology and social responsibility were to be valued more highly than a quick profit" —is not marketing; it is embedded in production, procurement, and design.

Maintenance, durability & warranty

Wilkhahn warrants that the goods shall substantially conform to design specifications under normal use; any failure to conform substantially must be reported in writing within five (5) years after receipt (USA terms; Europe and other markets may differ). Wilkhahn, upon being satisfied of the existence of such non-conformity, shall correct the same, at its sole election, either by repairing the non-conforming goods or by delivering replacement goods within a reasonable period .

Maintenance is straightforward: fabric upholstery should be vacuumed regularly; one owner notes the bright colour "did show up grime from my hands but now that it's been steam cleaned it looks like new" . The mechanism requires no user servicing—counter-pressure adjustment is via a simple knob, and the Trimension® kinematics are sealed. Replacement parts (castors, armrest pads, gas lifts, upholstery panels) are readily available through Wilkhahn's global dealer network and the company's own service channels. Since its foundation in 1907, Wilkhahn has consistently ensured that office furniture is durable and can be repaired . Expect a 10–15 year service life in normal commercial use; 24-hour models are engineered for even longer.

Pricing, value & where it sits in the market

European retail pricing for the ON 175/73 model starts from €2,078.22 (inclusive of VAT) ; North American pricing for comparable configurations typically ranges from $2,200 to $3,000+ depending on upholstery, base finish, and options. A more basic model (mesh backing, plastic base) was noted in one 2014 review at $1,100 in Singapore , though current pricing has risen. One used listing estimated retail at $2,458 .

This places the ON squarely in premium territory—above mainstream ergonomic chairs (Herman Miller Aeron, Steelcase Leap) and in the same league as the Embody, RH Logic 400, and top-tier HÅG models. These chairs come with a high standard of design and functionality, as well as a price to match . Value proposition depends on use case: for an executive or 24-hour environment where the chair will see 40–80 hours of weekly use over a decade or more, the per-hour cost is competitive and the ergonomic and sustainability benefits justify the outlay. For occasional home-office use, the cost is harder to rationalize.

Verdict—the bottom line

The Wilkhahn ON is the chair that proved three-dimensional dynamic sitting could be more than theory. Every once in a while a chair comes along that challenges well-held principles and notions and changes the way people look at things; the Wilkhahn ON is such an example . The patented Trimension® mechanism delivers genuine pelvic freedom—not just tilt, but rotation and lateral shift—in a package that feels intuitive, looks executive-grade, and meets the stringent demands of 24-hour certification and deep sustainability credentials.

The ON doesn't ask you to sit correctly; it invites your body to move the way it was designed to move.

It is expensive, uncompromisingly engineered, and built to last decades. If you spend long hours seated, value German craft and environmental responsibility, and want a chair that actively supports rather than passively accommodates, the Wilkhahn ON remains one of the most sophisticated ergonomic task chairs ever made. For everyone else, Wilkhahn's own IN or AT offer much of the same kinematic magic at more accessible price points—but the ON is the original, the flagship, and still the benchmark.