{
 "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": "rc-front-bumper-nose",
 "name": "RC car front bumper and nose (kick-up)",
 "kind": "standard",
 "category": "Car design",
 "group": "Car aero",
 "year": null,
 "question": "Why is the front of an RC car shaped with a bumper and upswept nose?",
 "tags": [
  "vehicle design",
  "car aero",
  "rc design",
  "aerodynamics",
  "guide"
 ],
 "aliases": [
  "rc front bumper",
  "rc car nose",
  "rc bumper rules",
  "foam bumper rc",
  "rc chassis kick up",
  "front skid plate rc",
  "touring car foam bumper",
  "buggy front bumper",
  "why rc cars have bumpers",
  "rc bumper thickness"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": false,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/rc-front-bumper-nose/",
 "sheet_txt": "https://xemstudio.com/objects/rc-front-bumper-nose/sheet.txt",
 "sheet": {
  "basis": "Design rules and figures from the cited sources; example geometry by Xem Studio",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "The bumper protects the chassis and front suspension in collisions, and rules keep it non-hazardous and inside the body outline: no part may extend outside the body shell viewed from any direction (AARCMCC) and no hazardous protruding bumpers are allowed (ROAR).",
   "EFRA fixes materials: wire bumpers 2.5-4 mm wire, sheet bumpers 2.5-6.5 mm thick, closed-cell foam up to 2 cm; 1/12 bumpers may extend 13 mm ahead of the body.",
   "Off-road chassis sweep the front upward (kick-up) so the front rolls over obstacles; most buggies start around 25-30 deg (CompetitionX)."
  ],
  "table": {
   "columns": [
    "parameter",
    "value or range",
    "source"
   ],
   "rows": [
    [
     "Wire bumper diameter",
     "2.5-4 mm",
     "EFRA"
    ],
    [
     "Sheet bumper thickness",
     "2.5-6.5 mm",
     "EFRA"
    ],
    [
     "Foam bumper thickness",
     "up to 2 cm",
     "EFRA"
    ],
    [
     "1/12 bumper forward extension",
     "max 13 mm ahead of body; 6.5 mm beyond side",
     "EFRA"
    ],
    [
     "Touring/GTP bumper",
     "min 2.5 mm thick; nothing outside body shell",
     "AARCMCC"
    ],
    [
     "Off-road kick-up start point",
     "25-30 deg",
     "CompetitionX"
    ]
   ]
  }
 },
 "sheet_text": "RC car front bumper and nose (kick-up) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/rc-front-bumper-nose/  (sheet CC BY 4.0)\nBasis: Design rules and figures from the cited sources; example geometry by Xem Studio\nCatalog version: 2026-10-20\n\nSizes: see table below\n- The bumper protects the chassis and front suspension in collisions, and rules keep it non-hazardous and inside the body outline: no part may extend outside the body shell viewed from any direction (AARCMCC) and no hazardous protruding bumpers are allowed (ROAR).\n- EFRA fixes materials: wire bumpers 2.5-4 mm wire, sheet bumpers 2.5-6.5 mm thick, closed-cell foam up to 2 cm; 1/12 bumpers may extend 13 mm ahead of the body.\n- Off-road chassis sweep the front upward (kick-up) so the front rolls over obstacles; most buggies start around 25-30 deg (CompetitionX).\n\nparameter  value or range  source\nWire bumper diameter  2.5-4 mm  EFRA\nSheet bumper thickness  2.5-6.5 mm  EFRA\nFoam bumper thickness  up to 2 cm  EFRA\n1/12 bumper forward extension  max 13 mm ahead of body; 6.5 mm beyond side  EFRA\nTouring/GTP bumper  min 2.5 mm thick; nothing outside body shell  AARCMCC\nOff-road kick-up start point  25-30 deg  CompetitionX\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- EFRA: EFRA Handbook 2010, Appendix 3: Electric Cars — web — Publisher's page; dimensions are facts — https://www.efra.ws/wp-content/uploads/2010/03/Handb10App3.pdf\n- AARCMCC: Section 3: Electric On Road, Technical Rules (Oct 2006) — web — Publisher's page; dimensions are facts — https://www.rctech.net/forum/attachments/australian-racing/180184d1162811203-aarcmcc-online-tech-road-oct-06.pdf\n- ROAR: ROAR Rule Book 2013 (club copy) — web — Publisher's page; dimensions are facts — https://www.rctech.net/forum/attachments/northwest-racers/1468674d1552337051-seattle-rc-racers-north-seatac-racing-center-2013_roar_rule_book.pdf\n- CompetitionX: RC Kickup Explained — web — Publisher's page; dimensions are facts — https://www.competitionx.com/?p=363\n\nNo true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.\nAPI: https://xemstudio.com/api/geometry?object=rc-front-bumper-nose\n",
 "sources": [
  {
   "publisher": "EFRA",
   "title": "EFRA Handbook 2010, Appendix 3: Electric Cars",
   "url": "https://www.efra.ws/wp-content/uploads/2010/03/Handb10App3.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "AARCMCC",
   "title": "Section 3: Electric On Road, Technical Rules (Oct 2006)",
   "url": "https://www.rctech.net/forum/attachments/australian-racing/180184d1162811203-aarcmcc-online-tech-road-oct-06.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "ROAR",
   "title": "ROAR Rule Book 2013 (club copy)",
   "url": "https://www.rctech.net/forum/attachments/northwest-racers/1468674d1552337051-seattle-rc-racers-north-seatac-racing-center-2013_roar_rule_book.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "CompetitionX",
   "title": "RC Kickup Explained",
   "url": "https://www.competitionx.com/?p=363",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "rear-wing-single-element",
  "rear-wing-dual-element",
  "swan-neck-wing-mount",
  "gurney-flap-wickerbill",
  "wing-endplates",
  "front-splitter"
 ],
 "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": "Can a bumper stick out past the body?",
   "a": "Not on AARCMCC on-road cars; EFRA 1/12 allows 13 mm forward."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/rc-front-bumper-nose/index.md"
}