{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "traxxas-titan-21t-550-motor",
 "name": "Traxxas Titan 21T 550 reverse-rotation brushed motor (TRX-4)",
 "kind": "modern",
 "category": "RC cars",
 "group": "Motors",
 "year": null,
 "question": "What are the dimensions of the Traxxas Titan 21T 550 reverse-rotation brushed motor?",
 "tags": [
  "rc car",
  "rc truck",
  "radio control",
  "hobby rc",
  "motors"
 ],
 "aliases": [
  "titan 21t dimensions",
  "titan 550 motor size",
  "trx-4 motor size",
  "traxxas 8676 motor",
  "titan 21t length",
  "550 motor diameter",
  "medidas motor titan 21t",
  "titan 21t maße",
  "traxxas titan 21t 550 reverse-rotation brushed motor specs"
 ],
 "overall_mm": {
  "length": 39,
  "width": 39,
  "height": 78
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/traxxas-titan-21t-550-motor/",
 "sheet_txt": "https://xemstudio.com/objects/traxxas-titan-21t-550-motor/sheet.txt",
 "sheet": {
  "basis": "Secondary source: Big Boys With Cool Toys (retailer, Traxxas spec copy), RC Car Action (copy of the maker's figures; the maker publishes none directly)",
  "overall_mm": {
   "length": 39,
   "width": 39,
   "height": 78
  },
  "notes": [
   "The Titan 21T is the high-torque 550 brushed motor in the TRX-4 and TRX-6 crawlers. The file is the Ø39 × 57 mm can.",
   "The two available copies of the spec sheet disagree on weight; both are listed. Mounting pattern is not published.",
   "True size, no printing tolerance added. Only published numbers are used; anything not published is said so.",
   "Secondary source: the numbers come from a retailer or magazine copy of the maker's specification."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "Diameter",
     "1.53 in (39 mm); RC Car Action reprint lists 38.9 mm"
    ],
    [
     "Can length",
     "2.25 in (57 mm)"
    ],
    [
     "Overall length",
     "3.07 in (78 mm)"
    ],
    [
     "Shaft",
     "3 mm"
    ],
    [
     "Weight",
     "8.47 oz (240 g) per retailer copy; 390 g (13.76 oz) per RC Car Action reprint"
    ],
    [
     "Voltage",
     "16.8 V"
    ]
   ]
  }
 },
 "sheet_text": "Traxxas Titan 21T 550 reverse-rotation brushed motor (TRX-4) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/traxxas-titan-21t-550-motor/  (sheet CC BY 4.0)\nBasis: Secondary source: Big Boys With Cool Toys (retailer, Traxxas spec copy), RC Car Action (copy of the maker's figures; the maker publishes none directly)\nCatalog version: 2026-10-20\n\nOverall (mm): length 39, width 39, height 78\n- The Titan 21T is the high-torque 550 brushed motor in the TRX-4 and TRX-6 crawlers. The file is the Ø39 × 57 mm can.\n- The two available copies of the spec sheet disagree on weight; both are listed. Mounting pattern is not published.\n- True size, no printing tolerance added. Only published numbers are used; anything not published is said so.\n- Secondary source: the numbers come from a retailer or magazine copy of the maker's specification.\n\ndimension  value\nDiameter  1.53 in (39 mm); RC Car Action reprint lists 38.9 mm\nCan length  2.25 in (57 mm)\nOverall length  3.07 in (78 mm)\nShaft  3 mm\nWeight  8.47 oz (240 g) per retailer copy; 390 g (13.76 oz) per RC Car Action reprint\nVoltage  16.8 V\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Big Boys With Cool Toys (retailer, Traxxas spec copy): TRX-4 2021 Bronco 92076-4 — web — Publisher's page; dimensions are facts — https://www.bigboyswithcooltoys.ca/products/tra92076-4-traxxas-trx4-scale-trail-2021-ford-bronco-1-10-crawler-red\n- RC Car Action: Traxxas TRX-4 2021 Ford Bronco — web — Publisher's page; dimensions are facts — https://www.rccaraction.com/?p=342113\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/traxxas-titan-21t-550-motor/index.json\nAPI: https://xemstudio.com/api/geometry?object=traxxas-titan-21t-550-motor\n",
 "sources": [
  {
   "publisher": "Big Boys With Cool Toys (retailer, Traxxas spec copy)",
   "title": "TRX-4 2021 Bronco 92076-4",
   "url": "https://www.bigboyswithcooltoys.ca/products/tra92076-4-traxxas-trx4-scale-trail-2021-ford-bronco-1-10-crawler-red",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "RC Car Action",
   "title": "Traxxas TRX-4 2021 Ford Bronco",
   "url": "https://www.rccaraction.com/?p=342113",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "dc-motor-550-555-size",
  "rc-plane-and-car-motors",
  "traxxas-velineon-3500-motor",
  "traxxas-velineon-540xl-motor",
  "traxxas-bl-2s-3300-motor"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.",
 "mating": [],
 "faq": [
  {
   "q": "How big is the TRX-4 Titan 21T motor?",
   "a": "39 mm diameter, 57 mm can, 78 mm overall, 3 mm shaft."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "traxxas-titan-21t-550-motor-envelope",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/traxxas-titan-21t-550-motor/traxxas-titan-21t-550-motor-envelope.step",
   "stl": "https://xemstudio.com/files/hardware/traxxas-titan-21t-550-motor/traxxas-titan-21t-550-motor-envelope.stl",
   "note": "Envelope Ø39 × 57 mm (Motor including shaft (overall length); the file models the 57 mm can)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/traxxas-titan-21t-550-motor/index.md"
}