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      "inseam_cm": 84,
      "torso_cm": 61,
      "arm_length_cm": 64,
      "shoulder_width_cm": 41,
      "sit_bone_width_mm": 121,
      "flexibility": "medium"
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      "sex": "unspecified",
      "resting_hr_bpm": 58,
      "max_hr_bpm": 184,
      "ftp_w": 205
    },
    "intent": {
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      "primary_disciplines": ["gravel", "touring"]
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    "derivation": {
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      "window_days": 180,
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      "longest_ride_distance_km": 118.0,
      "weekly_distance_km": 95.0,
      "rides_per_week": 2.4
    },
    "pace": {
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      "typical_duration_min": 118
    },
    "terrain": {
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    },
    "surface_mix": {
      "paved_pct": 55,
      "gravel_pct": 40,
      "offroad_pct": 5
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      "year": 2025,
      "size": "56",
      "color": "moss green",
      "mpn": "EC-WAL-56-MG",
      "gtin": "4012345678901"
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    "instance": {
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    "category": "gravel",
    "motor_assistance": "none",
    "geometry": {
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      "reach_mm": 384,
      "seat_tube_length_mm": 560,
      "seat_tube_angle_deg": 73.5,
      "top_tube_length_mm": 565,
      "head_tube_length_mm": 165,
      "head_tube_angle_deg": 71.5,
      "stem_length_mm": 90,
      "handlebar_width_mm": 440,
      "wheelbase_mm": 1036,
      "standover_mm": 792,
      "chainstay_length_mm": 425,
      "fork_rake_mm": 50,
      "bottom_bracket_drop_mm": 76,
      "crank_length_mm": 172.5
    },
    "wheels_tires": {
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      "tire_width_mm": 40,
      "max_tire_width_mm": 45,
      "recommended_pressure_bar": 2.4
    },
    "drivetrain": {
      "type": "derailleur",
      "chainring_count": 1,
      "cassette_speed_count": 11,
      "chainring_teeth": [40],
      "cassette_teeth": [11, 13, 15, 17, 19, 21, 24, 28, 32, 36, 42]
    },
    "weight_kg": 9.8
  },
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    "engine": {
      "name": "example-match-engine",
      "version": "0.1.0",
      "url": "https://example.invalid/engine"
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    "computed_at": "2026-08-17T12:05:00Z",
    "rider_ref": "c3a1f7e2-5b8d-4a06-9e21-7d54c2a90b11",
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    "score": 91,
    "confidence": 0.82,
    "breakdown": [
      {
        "dimension": "size_fit",
        "score": 94,
        "note": "Stack 591 / reach 384 (STR 1.54) sits in the balanced-endurance window for 178 cm with 84 cm inseam."
      },
      {
        "dimension": "use_case_fit",
        "score": 92,
        "note": "Measured 40% gravel share matches category; 45 mm clearance covers the measured surface mix."
      },
      {
        "dimension": "position_fit",
        "score": 86,
        "note": "Balanced position preference met; stem could go 10 mm shorter given torso length."
      }
    ]
  }
}