# Traxxas Titan 21T 550 reverse-rotation brushed motor (TRX-4)

> What are the dimensions of the Traxxas Titan 21T 550 reverse-rotation brushed motor?

- Category: RC cars › Motors
- Kind: Modern device
- 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)
- Page: https://xemstudio.com/objects/traxxas-titan-21t-550-motor/ · JSON: https://xemstudio.com/api/geometry?object=traxxas-titan-21t-550-motor · Plain text: https://xemstudio.com/objects/traxxas-titan-21t-550-motor/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/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 39 | 39 | 78 |

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

## 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.

## Sizes

| dimension | value |
|---|---|
| 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 |

## Where the files are

- Big Boys With Cool Toys (retailer, Traxxas spec copy): [TRX-4 2021 Bronco 92076-4](https://www.bigboyswithcooltoys.ca/products/tra92076-4-traxxas-trx4-scale-trail-2021-ford-bronco-1-10-crawler-red) — web — Publisher's page; dimensions are facts
- RC Car Action: [Traxxas TRX-4 2021 Ford Bronco](https://www.rccaraction.com/?p=342113) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/traxxas-titan-21t-550-motor/index.json

- traxxas-titan-21t-550-motor-envelope: [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) — Envelope Ø39 × 57 mm (Motor including shaft (overall length); the file models the 57 mm can)

## Questions

**How big is the TRX-4 Titan 21T motor?**

39 mm diameter, 57 mm can, 78 mm overall, 3 mm shaft.

## Fits with

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