# Doona car seat & stroller

> What diameter is the Doona car seat & stroller handlebar?

- Category: Everyday mounts › Strollers & car seats
- Kind: Modern device
- Basis: Published overall sizes only: Doona (official)
- Page: https://xemstudio.com/objects/doona-car-seat-stroller/ · JSON: https://xemstudio.com/api/geometry?object=doona-car-seat-stroller · Plain text: https://xemstudio.com/objects/doona-car-seat-stroller/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 820 | 440 | 990 |

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

## Notes

- The handlebar and frame tube diameters (what a cup holder, phone mount or hook clamps to) are not published; they come with the scan.
- The Doona is an infant car seat with fold-out wheels; the same handle is the carry handle and the stroller handlebar.
- A measured Xem scan is planned; until then this page carries only the published numbers and no geometry.
- Safety: a child car seat's harness, buckle, tongues and chest clip are crash-tested as part of the seat. NHTSA advises that aftermarket products are not recommended for use with car seats unless made or allowed by the car seat's maker, and Transport Canada reports that child-restraint makers advise that no third-party aftermarket products be used with their seats. Geometry here is for reference and for accessories that do not touch the restraint system. It is not for replacement or modified buckles, harness or chest-clip parts, and nothing should attach to or change the harness or buckle.

## Sizes

| feature | published value | from |
|---|---|---|
| unfolded (W × L × H) | 44 × 82 × 99 cm | Doona |
| folded (W × L × H) | 44 × 66 × 57 cm | Doona |
| weight | 7.8 kg | Doona |
| handlebar height | adjustable; not published | Doona |
| handlebar Ø, frame tube Ø | not published | — |

## Where the files are

- Doona (official): [Doona car seat & stroller: unfolded 44 × 82 × 99 cm, folded 44 × 66 × 57 cm, 7.8 kg](https://www.doona.com/car-seat-stroller/collections/doona-deep-blue) — web — manufacturer spec (verify at link)
- NHTSA: [Car seat glossary: aftermarket products are not recommended for use with car seats unless made or allowed by the car seat manufacturer](https://www.nhtsa.gov/car-seats-and-booster-seats/car-seat-glossary) — web — US government work (verify at link)
- Transport Canada: [Third-party aftermarket products for children's restraint systems](https://tc.canada.ca/en/road-transportation/defects-recalls-vehicles-tires-child-car-seats/third-party-aftermarket-products-children-s-restraint-systems) — web — Government of Canada (verify at link)

## Xem scan

Planned. Mesh $8, STEP $19, target ±0.15 mm.

## How it fits

### Connects to
- [Handlebar clamp rings: split rings for 22.2 to 35.0 mm bars, M4 / M5](https://xemstudio.com/objects/handlebar-clamp-rings/): a clamp ring at the handlebar Ø once it is scanned

## Questions

**What diameter is the Doona car seat & stroller handlebar?**

The maker does not publish it. A measured scan is planned; until then measure the bar where your part will sit.

**What are the Doona car seat & stroller dimensions?**

unfolded (W × L × H): 44 × 82 × 99 cm; folded (W × L × H): 44 × 66 × 57 cm; weight: 7.8 kg.

**Can I make a replacement buckle, chest clip or harness part from this?**

No. The harness, buckle and chest clip are tested with the seat; NHTSA advises against aftermarket products on car seats, and Transport Canada reports that seat makers do too. Replacement restraint parts come only from the seat's maker. This page is reference geometry for things that do not touch the restraint system.

## Fits with

- [Handlebar clamp rings: split rings for 22.2 to 35.0 mm bars, M4 / M5](https://xemstudio.com/objects/handlebar-clamp-rings/)
- [17 mm ball joint for phone mounts (ball stud)](https://xemstudio.com/objects/phone-mount-ball-17mm/)
- [Car cup holder sizes: published ranges](https://xemstudio.com/objects/car-cup-holder-sizes/)
- [Child car seat harness buckle (reference only)](https://xemstudio.com/objects/child-car-seat-harness-buckle/)