{
  "name": "Tall Chair Advisor — Office Chair Dimensions for Tall Users",
  "description": "Primary-sourced seat height, seat depth, back height and weight capacity for office chairs evaluated for users 6'0\" and above. Every figure carries the manufacturer document it was read from and the date it was verified.",
  "url": "https://tallchairadvisor.com/chair-specs/",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": "Tall Chair Advisor — https://tallchairadvisor.com",
  "version": "1.0.0",
  "lastVerified": "2026-08-06",
  "unitOfMeasure": "inches (dimensions), pounds (capacity)",
  "readme": {
    "coverage": "Four chairs. This is the set whose every figure has been read from a manufacturer specification document, not the set of chairs the site covers. A chair is absent because nobody has opened its spec PDF yet, never because it lacks dimensions.",
    "sourcing": "Manufacturer specification guides only. Retailer listings and review-site figures are not accepted as sources, because both are where the errors in this niche originate.",
    "guarded": "A guarded value is TRUE but MISLEADING ALONE: it requires an option selected at order time. Copying such a figure without its qualifier reproduces the error this registry was built to stop.",
    "hands_on": "Dimensional figures are documentary, not experiential. The only chair the author has used is the Steelcase Gesture; no figure here depends on having sat in anything."
  },
  "chairs": {
    "steelcase-leap-plus": {
      "product": "Steelcase Leap Plus",
      "seatHeight": {
        "default": {
          "min": 15.5,
          "max": 19.5,
          "unit": "in",
          "note": "Standard cylinder. This is what ships unless the 5\" cylinder is specified at order time."
        },
        "optional": {
          "min": 17.5,
          "max": 22.5,
          "unit": "in",
          "note": "Optional 5\" cylinder (~$63). The floor RISES to 17.5\" — this is not a superset of the default range."
        },
        "source": "Steelcase Seating Specification Guide — https://www.steelcase.com/content/uploads/2020/10/Seating-Leap-Seat.pdf",
        "sourceEditions": [
          "2020-10",
          "2017"
        ],
        "verified": "2026-08-06",
        "by": "Jackson",
        "sourceNote": "Both editions agree, and each states the figure in three places internally."
      },
      "seatDepth": {
        "min": 15.75,
        "max": 19.75,
        "unit": "in",
        "source": "Steelcase Seating Specification Guide",
        "verified": "2026-08-06"
      },
      "backHeight": {
        "value": 25.5,
        "unit": "in",
        "source": "Steelcase Seating Specification Guide",
        "verified": "2026-08-06"
      },
      "weightCapacity": {
        "value": 500,
        "unit": "lb",
        "source": "Steelcase product page",
        "verified": "2026-08-06"
      }
    },
    "steelcase-leap-v2": {
      "product": "Steelcase Leap V2 (standard Leap)",
      "seatHeight": {
        "default": {
          "min": 15.5,
          "max": 20.5,
          "unit": "in",
          "note": "5\" adjustment range. NOTE: the standard Leap's ceiling is HIGHER than the Leap Plus's default ceiling. The Plus trades seat-height range for width, back height, and capacity."
        },
        "source": "Steelcase Seating Specification Guide — https://www.steelcase.com/content/uploads/2020/10/Seating-Leap-Seat.pdf",
        "sourceEditions": [
          "2020-10",
          "2017"
        ],
        "verified": "2026-08-06",
        "by": "Jackson"
      },
      "_COMMON_ERROR": "This chair's 15.5\"-20.5\" range was cross-contaminated onto Leap Plus pages, including the v2's \"(5\" adjustment)\" parenthetical copied verbatim. Also frequently misquoted as a 20\" maximum; the spec guide says 20.5\"."
    },
    "steelcase-gesture": {
      "product": "Steelcase Gesture",
      "seatHeight": {
        "default": {
          "min": 16,
          "max": 21,
          "unit": "in"
        },
        "source": "Steelcase Seating Specification Guide",
        "verified": "2026-08-06",
        "by": "Jackson",
        "sourceNote": "Higher available with an optional cylinder; the default ceiling is 21\"."
      },
      "seatDepth": {
        "min": 15.75,
        "max": 18.75,
        "unit": "in",
        "source": "Steelcase Seating Specification Guide",
        "verified": "2026-08-06"
      }
    },
    "herman-miller-aeron-size-c": {
      "product": "Herman Miller Aeron Size C",
      "seatHeight": {
        "default": {
          "min": 16,
          "max": 20.5,
          "unit": "in",
          "note": "Hard limit — no optional cylinder raises this."
        },
        "source": "Herman Miller Aeron product specification sheet",
        "verified": "2026-08-06",
        "by": "Jackson"
      },
      "seatDepth": {
        "value": null,
        "unit": "in",
        "note": "Fixed by size; Size C is not depth-adjustable."
      }
    }
  },
  "guarded": [
    {
      "id": "leap-plus-22-5-seat-height",
      "value": "22.5",
      "appliesTo": "steelcase-leap-plus",
      "context": [
        "seat height",
        "seat-height",
        "seatHeight",
        "height ceiling",
        "maximum height",
        "max seat"
      ],
      "requires": [
        "leap plus"
      ],
      "excludeContext": [
        "seat width",
        "width",
        "back height",
        "backrest",
        "headrest",
        "at least",
        "≥"
      ],
      "qualifiers": [
        "optional",
        "5\" cylinder",
        "5-inch cylinder",
        "5in cylinder",
        "opt. cylinder",
        "optional cylinder",
        "upgraded cylinder",
        "cylinder upgrade",
        "specified at order",
        "order time",
        "not the default",
        "standard cylinder stops",
        "std;",
        "w/ optional"
      ],
      "message": "The Leap Plus reaches 22.5\" ONLY with the optional 5\" cylinder. The default chair stops at 19.5\". State the qualifier on the same line, or use 19.5\".",
      "since": "2026-08-09"
    },
    {
      "id": "leap-plus-fabricated-range",
      "value": "15.5–22.5",
      "appliesTo": "steelcase-leap-plus",
      "context": [],
      "qualifiers": [],
      "banned": true,
      "message": "15.5\"-22.5\" is not a real Steelcase configuration. It welds the standard cylinder's minimum (15.5\") to the optional cylinder's maximum (22.5\"). Use 15.5\"-19.5\" (standard) or 17.5\"-22.5\" (optional 5\" cylinder).",
      "since": "2026-08-09"
    }
  ]
}