{
  "name": "TireFitLab wheel-width and offset compensation study",
  "version": "1.0.0",
  "generatedOn": "2026-07-22",
  "units": {
    "width": "in",
    "offset": "mm",
    "edgeChange": "mm"
  },
  "assumptions": [
    "Nominal wheel width is the marked bead-seat width.",
    "No spacer is included.",
    "The calculation preserves one nominal wheel edge at a time.",
    "The output does not establish vehicle, brake, suspension or arch clearance."
  ],
  "formula": {
    "preserveOuter": "targetET = currentET + (targetWidthMm - currentWidthMm) / 2",
    "preserveInner": "targetET = currentET - (targetWidthMm - currentWidthMm) / 2"
  },
  "rows": [
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 6,
      "preservedEdge": "outer",
      "targetOffsetMm": 9.600000000000001,
      "outerFaceChangeMm": -7.105427357601002e-15,
      "innerClearanceLossMm": -50.800000000000004
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 6,
      "preservedEdge": "inner",
      "targetOffsetMm": 60.4,
      "outerFaceChangeMm": -50.800000000000004,
      "innerClearanceLossMm": -7.105427357601002e-15
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 6.5,
      "preservedEdge": "outer",
      "targetOffsetMm": 15.950000000000003,
      "outerFaceChangeMm": 0,
      "innerClearanceLossMm": -38.099999999999994
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 6.5,
      "preservedEdge": "inner",
      "targetOffsetMm": 54.05,
      "outerFaceChangeMm": -38.099999999999994,
      "innerClearanceLossMm": 0
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 7,
      "preservedEdge": "outer",
      "targetOffsetMm": 22.3,
      "outerFaceChangeMm": -3.552713678800501e-15,
      "innerClearanceLossMm": -25.400000000000002
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 7,
      "preservedEdge": "inner",
      "targetOffsetMm": 47.7,
      "outerFaceChangeMm": -25.400000000000006,
      "innerClearanceLossMm": 0
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 7.5,
      "preservedEdge": "outer",
      "targetOffsetMm": 28.65,
      "outerFaceChangeMm": 7.105427357601002e-15,
      "innerClearanceLossMm": -12.699999999999996
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 7.5,
      "preservedEdge": "inner",
      "targetOffsetMm": 41.35,
      "outerFaceChangeMm": -12.699999999999996,
      "innerClearanceLossMm": 7.105427357601002e-15
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 8,
      "preservedEdge": "outer",
      "targetOffsetMm": 35,
      "outerFaceChangeMm": 0,
      "innerClearanceLossMm": 0
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 8,
      "preservedEdge": "inner",
      "targetOffsetMm": 35,
      "outerFaceChangeMm": 0,
      "innerClearanceLossMm": 0
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 8.5,
      "preservedEdge": "outer",
      "targetOffsetMm": 41.35,
      "outerFaceChangeMm": -7.105427357601002e-15,
      "innerClearanceLossMm": 12.699999999999996
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 8.5,
      "preservedEdge": "inner",
      "targetOffsetMm": 28.65,
      "outerFaceChangeMm": 12.699999999999996,
      "innerClearanceLossMm": -7.105427357601002e-15
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 9,
      "preservedEdge": "outer",
      "targetOffsetMm": 47.7,
      "outerFaceChangeMm": 0,
      "innerClearanceLossMm": 25.400000000000006
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 9,
      "preservedEdge": "inner",
      "targetOffsetMm": 22.3,
      "outerFaceChangeMm": 25.400000000000002,
      "innerClearanceLossMm": 3.552713678800501e-15
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 9.5,
      "preservedEdge": "outer",
      "targetOffsetMm": 54.05,
      "outerFaceChangeMm": 0,
      "innerClearanceLossMm": 38.099999999999994
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 9.5,
      "preservedEdge": "inner",
      "targetOffsetMm": 15.950000000000003,
      "outerFaceChangeMm": 38.099999999999994,
      "innerClearanceLossMm": 0
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 10,
      "preservedEdge": "outer",
      "targetOffsetMm": 60.4,
      "outerFaceChangeMm": 7.105427357601002e-15,
      "innerClearanceLossMm": 50.800000000000004
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 10,
      "preservedEdge": "inner",
      "targetOffsetMm": 9.600000000000001,
      "outerFaceChangeMm": 50.800000000000004,
      "innerClearanceLossMm": 7.105427357601002e-15
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 10.5,
      "preservedEdge": "outer",
      "targetOffsetMm": 66.75,
      "outerFaceChangeMm": 0,
      "innerClearanceLossMm": 63.5
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 10.5,
      "preservedEdge": "inner",
      "targetOffsetMm": 3.25,
      "outerFaceChangeMm": 63.5,
      "innerClearanceLossMm": 0
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 11,
      "preservedEdge": "outer",
      "targetOffsetMm": 73.1,
      "outerFaceChangeMm": 0,
      "innerClearanceLossMm": 76.19999999999999
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 11,
      "preservedEdge": "inner",
      "targetOffsetMm": -3.0999999999999943,
      "outerFaceChangeMm": 76.19999999999999,
      "innerClearanceLossMm": 0
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 11.5,
      "preservedEdge": "outer",
      "targetOffsetMm": 79.44999999999999,
      "outerFaceChangeMm": 0,
      "innerClearanceLossMm": 88.89999999999998
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 11.5,
      "preservedEdge": "inner",
      "targetOffsetMm": -9.449999999999996,
      "outerFaceChangeMm": 88.89999999999998,
      "innerClearanceLossMm": -7.105427357601002e-15
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 12,
      "preservedEdge": "outer",
      "targetOffsetMm": 85.8,
      "outerFaceChangeMm": -1.4210854715202004e-14,
      "innerClearanceLossMm": 101.59999999999998
    },
    {
      "referenceWidthIn": 8,
      "referenceOffsetMm": 35,
      "targetWidthIn": 12,
      "preservedEdge": "inner",
      "targetOffsetMm": -15.799999999999997,
      "outerFaceChangeMm": 101.59999999999998,
      "innerClearanceLossMm": -1.4210854715202004e-14
    }
  ]
}