# Rear toe-in

> Why do RC cars run rear toe-in?

- Category: Car design › Suspension geometry
- Kind: Standard part
- Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
- Page: https://xemstudio.com/objects/toe-rear/ · JSON: https://xemstudio.com/api/geometry?object=toe-rear · Plain text: https://xemstudio.com/objects/toe-rear/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files Xem Studio Design License (free to use and sell from, not to redistribute as files: https://xemstudio.com/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

- Rear toe-in adds stability on power and under braking at a small cost in top speed (Tekno), and improves cornering stability on full-size cars (Wikipedia).
- EuroRC gives 1-4 deg rear toe-in for RC cars and says never to run rear toe-out because it causes snap oversteer.
- The file is a reference example built by Xem Studio from the numbers above (Reference 1/10 off-road: track 250 mm and 90 mm wheel+tyre (EFRA maxima); wheelbase illustrative.). Sizes the sources do not fix are illustrative; scale the example to your own vehicle.

## Sizes

| parameter | value or range | source |
|---|---|---|
| RC rear toe-in | 1-4 deg | EuroRC set-up guide |
| Rear toe-out | avoid (snap oversteer) | EuroRC set-up guide |
| Effect | more on-power and braking stability, less top speed | Tekno setup guide |

## Where the files are

- EuroRC: [Short set-up guide](https://www.eurorc.com/page/135/short-set-up-guide) — web — Publisher's page; dimensions are facts
- Tekno RC: [Tekno RC Setup Guide](https://teknoforums.com/misc/Tekno-RC-Setup-Guide.pdf) — web — Publisher's page; dimensions are facts
- Wikipedia: [Toe (automotive)](https://en.wikipedia.org/wiki/Toe_(automotive)) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, Xem Studio Design License, Xem Studio)

Index: https://xemstudio.com/files/hardware/toe-rear/index.json · license: https://xemstudio.com/files/hardware/toe-rear/LICENSE.md

- toe-rear-geometry: [STEP](https://xemstudio.com/files/hardware/toe-rear/toe-rear-geometry.step) · [STL](https://xemstudio.com/files/hardware/toe-rear/toe-rear-geometry.stl) — Toe demo: front wheels toed 2.5° (illustrative layout)

## Questions

**Is rear toe-out ever used?**

EuroRC advises never, because of snap oversteer.

## Fits with

- [Camber angle](https://xemstudio.com/objects/camber/)
- [Caster angle](https://xemstudio.com/objects/caster/)
- [Front kick-up (RC)](https://xemstudio.com/objects/kick-up/)
- [Front toe (toe-in / toe-out)](https://xemstudio.com/objects/toe-front/)
- [Ackermann steering geometry](https://xemstudio.com/objects/ackermann/)
- [Reverse (anti-) Ackermann](https://xemstudio.com/objects/anti-ackermann/)