CheckFitment
Bolt patterns and wheel specs by vehicle, wheel and tire fitment, spacer and gear ratio maths.
我該用這個嗎
品質與安全性
A
根據工具定義與協定合規性的自動化分析。
上下文成本
~3,742Token（工具定義）
~5.4 KB典型回應大小
顯著的注意力影響（128k 上下文的 2.92%）
這是每次將伺服器的工具載入模型上下文時所消耗的約略 token 數量。數量越高，可用於其他工作的注意力就越少。
安裝
一鍵安裝
將以下內容加入你的 `claude_desktop_config.json` 檔案：
{
"mcpServers": {
"checkfitment": {
"url": "https://checkfitment.com/mcp?src=mcp"
}
}
}遠端端點
https://checkfitment.com/mcp?src=mcpstreamable-http它能做什麼
工具清單
工具（6）
🟢 唯讀🟡 寫入🔴 刪除⚪ 未知
🟢bolt_pattern_lookup(make, model, year, wheel_center_bore_mm)
Use for "what is the bolt pattern on a 2019 Ford F-150", lug torque, center bore, thread size, OEM wheel size, offset or tire size of a vehicle, or "will these wheels fit my car" when the vehicle is named. Looks the vehicle up in the CheckFitment dataset (a fixed set of vehicles, each spec cited to manufacturer documents and marked verified or unverified). If the vehicle or year is not in the dataset the tool says so (not_in_database / year_covered false) and gives no figures; never fill them in from memory. Optional wheel_center_bore_mm runs the hub-centric check.
輸入結構描述
{
"type": "object",
"properties": {
"make": {
"type": "string",
"description": "e.g. Ford, Toyota, Jeep"
},
"model": {
"type": "string",
"description": "e.g. F-150, Tacoma, Wrangler"
},
"year": {
"type": "integer",
"minimum": 1950,
"maximum": 2030
},
"wheel_center_bore_mm": {
"type": "number",
"description": "Optional: center bore of a wheel you want to check against the hub."
}
},
"required": [
"make",
"model"
],
"additionalProperties": false
}輸出結構描述
{
"type": "object",
"properties": {
"not_in_database": {
"type": "boolean"
},
"ambiguous": {
"type": "boolean"
},
"candidates": {
"type": "array",
"items": {
"type": "string"
}
},
"make": {
"type": [
"string",
"null"
]
},
"model": {
"type": "string"
},
"year": {
"type": [
"number",
"null"
]
},
"year_covered": {
"type": "boolean"
},
"years_in_dataset": {
"type": "string"
},
"models_for_make": {
"type": "array",
"items": {
"type": "string"
}
},
"makes_in_database": {
"type": "array",
"items": {
"type": "string"
}
},
"generations": {
"type": "array",
"items": {
"type": "object",
"properties": {
"years": {
"type": "string"
},
"generation": {
"type": [
"string",
"null"
]
},
"trim": {
"type": [
"string",
"null"
]
},
"bolt_pattern_mm": {
"type": "string"
},
"bolt_pattern_in": {
"type": "string"
},
"center_bore_mm": {
"type": [
"number",
"null"
]
},
"thread": {
"type": [
"string",
"null"
]
},
"fastener": {
"type": "string"
},
"fastener_note": {
"type": [
"string",
"null"
]
},
"lug_torque_lbft": {
"type": [
"number",
"null"
]
},
"lug_torque_nm": {
"type": [
"number",
"null"
]
},
"lug_torque_steel_lbft": {
"type": [
"number",
"null"
]
},
"lug_torque_text": {
"type": [
"string",
"null"
]
},
"lug_torque_note": {
"type": [
"string",
"null"
]
},
"oem_wheels": {
"type": "array",
"items": {
"type": "string"
}
},
"oem_offset": {
"type": "string"
},
"oem_tires": {
"type": "array",
"items": {
"type": "string"
}
},
"verified": {
"type": "boolean"
},
"confidence": {
"type": [
"string",
"null"
]
},
"sources": {
"type": "array",
"items": {
"type": "object",
"properties": {
"type": {
"type": "string"
},
"ref": {
"type": "string"
},
"url": {
"type": [
"string",
"null"
]
}
},
"required": [
"type",
"ref"
]
}
},
"notes": {
"type": [
"string",
"null"
]
}
},
"required": [
"years",
"bolt_pattern_mm",
"bolt_pattern_in",
"verified",
"sources"
]
}
},
"specs_differ_between_candidates": {
"type": "boolean"
},
"patterns": {
"type": "array",
"items": {
"type": "string"
}
},
"lookalike_patterns": {
"type": "array",
"items": {
"type": "object",
"properties": {
"pattern": {
"type": "string"
},
"lookalike": {
"type": "string"
},
"gap_mm": {
"type": "number"
},
"tier": {
"type": "string"
}
}
}
},
"lug_sequence": {
"type": [
"array",
"null"
],
"items": {
"type": "integer"
}
},
"center_bore_check": {
"type": [
"object",
"null"
],
"properties": {
"hub_mm": {
"type": "number"
},
"wheel_bore_mm": {
"type": "number"
},
"status": {
"type": "string"
},
"gap_mm": {
"type": "number"
},
"ring": {
"type": [
"string",
"null"
]
}
}
},
"link": {
"type": "string"
},
"disclaimer": {
"type": "string"
}
},
"required": [
"not_in_database",
"generations",
"link",
"disclaimer"
]
}🟢wheel_fitment_check(current_wheel_width_in, current_offset_mm, current_tire, new_wheel_width_in, new_offset_mm, ...)
Use to compare a current wheel (and tire) with a new one: how far the outer edge pokes toward the fender and the inner edge toward the suspension, the diameter and ride-height change, speedometer effect, backspacing, and whether the new tire width suits the new rim width. With measured clearances (outer: tire edge to fender lip; inner: to the nearest suspension part, both on the current setup) it returns fits / tight / rub. Leave the tire fields out for a wheel-only offset comparison.
輸入結構描述
{
"type": "object",
"properties": {
"current_wheel_width_in": {
"type": "number",
"minimum": 4,
"maximum": 16
},
"current_offset_mm": {
"type": "number",
"minimum": -100,
"maximum": 100
},
"current_tire": {
"type": "string",
"description": "Current tire size. Metric like 265/70R17 (P or LT prefix allowed) or flotation like 33x12.50R17; no load index or speed rating."
},
"new_wheel_width_in": {
"type": "number",
"minimum": 4,
"maximum": 16
},
"new_offset_mm": {
"type": "number",
"minimum": -100,
"maximum": 100
},
"new_tire": {
"type": "string",
"description": "New tire size. Metric like 265/70R17 (P or LT prefix allowed) or flotation like 33x12.50R17; no load index or speed rating."
},
"outer_clearance_mm": {
"type": "number",
"minimum": 0,
"description": "Measured on the current setup: tire sidewall to fender lip."
},
"inner_clearance_mm": {
"type": "number",
"minimum": 0,
"description": "Measured on the current setup: inner sidewall to the nearest suspension or body part."
}
},
"required": [
"current_wheel_width_in",
"current_offset_mm",
"new_wheel_width_in",
"new_offset_mm"
],
"additionalProperties": false
}輸出結構描述
{
"type": "object",
"properties": {
"mode": {
"type": "string",
"enum": [
"wheel_only",
"wheel_and_tire"
]
},
"current": {
"type": "object"
},
"new": {
"type": "object"
},
"poke_out_mm": {
"type": "number"
},
"inner_in_mm": {
"type": "number"
},
"center_shift_mm": {
"type": "number"
},
"outer_edge_set_by": {
"type": "string"
},
"inner_edge_set_by": {
"type": "string"
},
"diameter_change_mm": {
"type": "number"
},
"diameter_change_in": {
"type": "number"
},
"ride_height_change_mm": {
"type": "number"
},
"speedometer_reads_low_pct": {
"type": "number"
},
"shown_at_true_60": {
"type": "number"
},
"backspacing_old_in": {
"type": "number"
},
"backspacing_new_in": {
"type": "number"
},
"outer_verdict": {
"type": [
"string",
"null"
]
},
"outer_clearance_left_mm": {
"type": [
"number",
"null"
]
},
"inner_verdict": {
"type": [
"string",
"null"
]
},
"inner_clearance_left_mm": {
"type": [
"number",
"null"
]
},
"verdict": {
"type": [
"string",
"null"
]
},
"tire_on_rim": {
"type": "object",
"properties": {
"status": {
"type": "string"
},
"note": {
"type": "string"
},
"ideal_rim_in": {
"type": "number"
},
"min_rim_in": {
"type": "number"
},
"max_rim_in": {
"type": "number"
},
"effective_tread_width_mm": {
"type": "number"
}
}
},
"link": {
"type": "string"
},
"disclaimer": {
"type": "string"
}
},
"required": [
"mode",
"poke_out_mm",
"inner_in_mm",
"backspacing_old_in",
"backspacing_new_in",
"link",
"disclaimer"
]
}🟢tire_size_compare(old_tire, new_tire, speed_shown)
Use for "what changes if I go from 265/70R17 to 285/75R17", "how far off is my speedometer with 33s", or odometer error after a tire change. Returns diameter, width, sidewall and ride-height change, the true speed when the speedometer shows a given value, the odometer error and how serious it is.
輸入結構描述
{
"type": "object",
"properties": {
"old_tire": {
"type": "string",
"description": "Factory or current tire. Metric like 265/70R17 (P or LT prefix allowed) or flotation like 33x12.50R17; no load index or speed rating."
},
"new_tire": {
"type": "string",
"description": "New tire. Metric like 265/70R17 (P or LT prefix allowed) or flotation like 33x12.50R17; no load index or speed rating."
},
"speed_shown": {
"type": "number",
"minimum": 1,
"maximum": 200,
"description": "Speedometer reading to convert (default 60)."
}
},
"required": [
"old_tire",
"new_tire"
],
"additionalProperties": false
}輸出結構描述
{
"type": "object",
"properties": {
"old_tire": {
"type": "object",
"properties": {
"size": {
"type": "string"
},
"diameter_in": {
"type": "number"
},
"diameter_mm": {
"type": "number"
},
"section_width_mm": {
"type": "number"
},
"sidewall_mm": {
"type": "number"
}
}
},
"new_tire": {
"type": "object",
"properties": {
"size": {
"type": "string"
},
"diameter_in": {
"type": "number"
},
"diameter_mm": {
"type": "number"
},
"section_width_mm": {
"type": "number"
},
"sidewall_mm": {
"type": "number"
}
}
},
"diameter_change_pct": {
"type": "number"
},
"diameter_change_in": {
"type": "number"
},
"ride_height_change_in": {
"type": "number"
},
"width_change_mm": {
"type": "number"
},
"speed_shown": {
"type": "number"
},
"true_speed_at_shown": {
"type": "number"
},
"odometer_error_pct": {
"type": "number"
},
"severity": {
"type": "string"
},
"severity_note": {
"type": "string"
},
"link": {
"type": "string"
},
"disclaimer": {
"type": "string"
}
},
"required": [
"old_tire",
"new_tire",
"diameter_change_pct",
"true_speed_at_shown",
"severity",
"link",
"disclaimer"
]
}🟢wheel_spacer_calculator(offset_mm, target_offset_mm, spacer_mm, stud, stud_protrusion_mm, ...)
Use for "do I need spacers", "what spacer gets +35 wheels to +20", "is a 10 mm slip-on spacer safe". A spacer lowers the effective offset by its thickness. Returns the spacer needed for a target offset (and the nearest common size), the effective offset, track change, whether it is slip-on or bolt-on territory, and, with stud, stud_protrusion_mm and wheel_pad_thickness_mm, the slip-on thread-engagement check (≥ 1 × stud diameter and ≥ 6.5 turns).
輸入結構描述
{
"type": "object",
"properties": {
"offset_mm": {
"type": "number",
"minimum": -100,
"maximum": 100,
"description": "Offset (ET) of the wheel."
},
"target_offset_mm": {
"type": "number",
"minimum": -100,
"maximum": 100
},
"spacer_mm": {
"type": "number",
"minimum": 0,
"maximum": 100
},
"stud": {
"type": "string",
"enum": [
"M12x1.5",
"M12x1.25",
"M14x1.5",
"M14x2.0",
"1/2-20",
"9/16-18",
"7/16-20"
]
},
"stud_protrusion_mm": {
"type": "number",
"minimum": 0,
"description": "Stud length past the hub face."
},
"wheel_pad_thickness_mm": {
"type": "number",
"minimum": 0,
"description": "Thickness of the wheel mounting pad."
}
},
"required": [
"offset_mm"
],
"additionalProperties": false
}輸出結構描述
{
"type": "object",
"properties": {
"offset_mm": {
"type": "number"
},
"target_offset_mm": {
"type": [
"number",
"null"
]
},
"spacer_needed": {
"type": [
"object",
"null"
],
"properties": {
"exact_mm": {
"type": "number"
},
"possible": {
"type": "boolean"
},
"nearest_common_mm": {
"type": [
"number",
"null"
]
}
}
},
"spacer_mm": {
"type": [
"number",
"null"
]
},
"effective_offset_mm": {
"type": [
"number",
"null"
]
},
"moves_out_mm": {
"type": [
"number",
"null"
]
},
"track_change_mm": {
"type": [
"number",
"null"
]
},
"spacer_type": {
"type": [
"string",
"null"
]
},
"engagement": {
"type": [
"object",
"null"
],
"properties": {
"stud": {
"type": "string"
},
"engaged_before_mm": {
"type": "number"
},
"engaged_after_mm": {
"type": "number"
},
"turns_after": {
"type": "number"
},
"min_mm": {
"type": "number"
},
"min_turns": {
"type": "number"
},
"safe": {
"type": "boolean"
},
"extra_stud_length_needed_mm": {
"type": "number"
}
}
},
"link": {
"type": "string"
},
"disclaimer": {
"type": "string"
}
},
"required": [
"offset_mm",
"link",
"disclaimer"
]
}🟢gear_ratio_calculator(old_tire, new_tire, axle_ratio, speed_mph, transfer_case_low_ratio, ...)
Use for "what does my 3.73 axle behave like on 35s", "what ratio do I need to regear for 33s", RPM at highway speed after a tire change, or the crawl ratio (with transfer-case low ratio and first gear). Returns the effective ratio, RPM before and after in a 1:1 gear, the ratio that restores stock feel, the nearest gear set actually sold and how serious the change is.
輸入結構描述
{
"type": "object",
"properties": {
"old_tire": {
"type": "string",
"description": "Factory tire. Metric like 265/70R17 (P or LT prefix allowed) or flotation like 33x12.50R17; no load index or speed rating."
},
"new_tire": {
"type": "string",
"description": "New tire. Metric like 265/70R17 (P or LT prefix allowed) or flotation like 33x12.50R17; no load index or speed rating."
},
"axle_ratio": {
"type": "number",
"minimum": 1.5,
"maximum": 8,
"description": "Current axle (differential) ratio, e.g. 3.73."
},
"speed_mph": {
"type": "number",
"minimum": 1,
"maximum": 150,
"description": "Road speed for the RPM figures (default 65)."
},
"transfer_case_low_ratio": {
"type": "number",
"minimum": 1,
"maximum": 10
},
"first_gear_ratio": {
"type": "number",
"minimum": 1,
"maximum": 10
}
},
"required": [
"old_tire",
"new_tire",
"axle_ratio"
],
"additionalProperties": false
}輸出結構描述
{
"type": "object",
"properties": {
"old_tire": {
"type": "object",
"properties": {
"size": {
"type": "string"
},
"diameter_in": {
"type": "number"
},
"diameter_mm": {
"type": "number"
},
"section_width_mm": {
"type": "number"
},
"sidewall_mm": {
"type": "number"
}
}
},
"new_tire": {
"type": "object",
"properties": {
"size": {
"type": "string"
},
"diameter_in": {
"type": "number"
},
"diameter_mm": {
"type": "number"
},
"section_width_mm": {
"type": "number"
},
"sidewall_mm": {
"type": "number"
}
}
},
"diameter_change_pct": {
"type": "number"
},
"axle_ratio": {
"type": "number"
},
"effective_ratio": {
"type": "number"
},
"speed_mph": {
"type": "number"
},
"rpm_old_at_speed_direct_drive": {
"type": "number"
},
"rpm_new_at_speed_direct_drive": {
"type": "number"
},
"regear_ratio_to_restore": {
"type": "number"
},
"nearest_stock_ratio": {
"type": "number"
},
"nearest_stock_delta": {
"type": "number"
},
"severity": {
"type": "string"
},
"severity_note": {
"type": "string"
},
"crawl": {
"type": [
"object",
"null"
],
"properties": {
"with_current_axle": {
"type": "number"
},
"rating": {
"type": "string"
},
"rating_note": {
"type": "string"
},
"with_nearest_regear": {
"type": "number"
}
}
},
"link": {
"type": "string"
},
"disclaimer": {
"type": "string"
}
},
"required": [
"axle_ratio",
"effective_ratio",
"regear_ratio_to_restore",
"nearest_stock_ratio",
"link",
"disclaimer"
]
}🟢bolt_pattern_facts(pattern)
Use for "what is 5x114.3 in inches", "is 5x114.3 the same as 5x115", "will 6x135 wheels fit 6x139.7", or which vehicles use a pattern. Converts mm and inch notation, lists look-alike patterns that do not interchange, the vehicles in the dataset with that pattern, the lug tightening order and typical torque ranges by stud size (guidance only).
輸入結構描述
{
"type": "object",
"properties": {
"pattern": {
"type": "string",
"description": "5x114.3, 5x4.5, 6x139.7, 8x6.5 …"
}
},
"required": [
"pattern"
],
"additionalProperties": false
}輸出結構描述
{
"type": "object",
"properties": {
"pattern_mm": {
"type": "string"
},
"pattern_in": {
"type": "string"
},
"lugs": {
"type": "integer"
},
"pcd_mm": {
"type": "number"
},
"pcd_in": {
"type": "number"
},
"lookalikes": {
"type": "array",
"items": {
"type": "object",
"properties": {
"pattern": {
"type": "string"
},
"gap_mm": {
"type": "number"
},
"tier": {
"type": "string"
},
"interchangeable": {
"type": "boolean"
}
}
}
},
"vehicles_in_dataset": {
"type": "array",
"items": {
"type": "object",
"properties": {
"make": {
"type": "string"
},
"model": {
"type": "string"
},
"years": {
"type": "string"
},
"link": {
"type": "string"
}
}
}
},
"lug_sequence": {
"type": [
"array",
"null"
],
"items": {
"type": "integer"
}
},
"typical_torque_by_stud": {
"type": "array",
"items": {
"type": "object",
"properties": {
"stud": {
"type": "string"
},
"lbft_min": {
"type": "number"
},
"lbft_max": {
"type": "number"
},
"note": {
"type": "string"
}
}
}
},
"link": {
"type": "string"
},
"disclaimer": {
"type": "string"
}
},
"required": [
"pattern_mm",
"pattern_in",
"lugs",
"lookalikes",
"vehicles_in_dataset",
"link",
"disclaimer"
]
}社群
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