# RC car front bumper and nose (kick-up)

> Why is the front of an RC car shaped with a bumper and upswept nose?

- Category: Car design › Car aero
- Kind: Standard part
- Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
- Page: https://xemstudio.com/objects/rc-front-bumper-nose/ · JSON: https://xemstudio.com/api/geometry?object=rc-front-bumper-nose · Plain text: https://xemstudio.com/objects/rc-front-bumper-nose/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** True size, with no printing tolerance added.

## 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).

## Sizes

| parameter | value or range | source |
|---|---|---|
| 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 |

## Where the files are

- EFRA: [EFRA Handbook 2010, Appendix 3: Electric Cars](https://www.efra.ws/wp-content/uploads/2010/03/Handb10App3.pdf) — web — Publisher's page; dimensions are facts
- AARCMCC: [Section 3: Electric On Road, Technical Rules (Oct 2006)](https://www.rctech.net/forum/attachments/australian-racing/180184d1162811203-aarcmcc-online-tech-road-oct-06.pdf) — web — Publisher's page; dimensions are facts
- ROAR: [ROAR Rule Book 2013 (club copy)](https://www.rctech.net/forum/attachments/northwest-racers/1468674d1552337051-seattle-rc-racers-north-seatac-racing-center-2013_roar_rule_book.pdf) — web — Publisher's page; dimensions are facts
- CompetitionX: [RC Kickup Explained](https://www.competitionx.com/?p=363) — web — Publisher's page; dimensions are facts

## Questions

**Can a bumper stick out past the body?**

Not on AARCMCC on-road cars; EFRA 1/12 allows 13 mm forward.

## Fits with

- [Single-element rear wing (race car)](https://xemstudio.com/objects/rear-wing-single-element/)
- [Dual-element (two-element) rear wing](https://xemstudio.com/objects/rear-wing-dual-element/)
- [Swan-neck rear wing mount](https://xemstudio.com/objects/swan-neck-wing-mount/)
- [Gurney flap / wickerbill](https://xemstudio.com/objects/gurney-flap-wickerbill/)
- [Wing endplates / side dams](https://xemstudio.com/objects/wing-endplates/)
- [Front splitter](https://xemstudio.com/objects/front-splitter/)