Chicco NextFit Max vs Diono Radian 3RXT

Both are convertible car seats — here are their published manufacturer specs side by side.

This compares published manufacturer specs — not safety or fit advice. The seat's manual, your vehicle's manual, NHTSA's tools and a certified CPST are the fit-and-safety authority; always check them before installing.

Spec	Chicco NextFit Max	Diono Radian 3RXT
Stage	Convertible	Convertible
Narrow (3-across)	–	✓
Extended rear-facing	✓	✓
FAA-approved	✓	✓
Lightweight / travel	–	–

How they differ

• the Diono Radian 3RXT is listed narrow (roughly ≤17″) for fitting three across a back seat; the Chicco NextFit Max isn't listed narrow

Where to buy

Check the Chicco NextFit Max price on Amazon →

Check the Diono Radian 3RXT price on Amazon →

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FAQ

What's the difference between the Chicco NextFit Max and the Diono Radian 3RXT?
The Chicco NextFit Max is extended rear-facing, FAA-approved for aircraft; the Diono Radian 3RXT is narrow for 3-across, extended rear-facing, FAA-approved for aircraft. Both are convertible car seats.

Which fits three across, the Chicco NextFit Max or the Diono Radian 3RXT?
The Diono Radian 3RXT is listed narrow (~≤17″) for 3-across; the Chicco NextFit Max isn't. Three-across fit still depends on your exact vehicle — confirm before buying.

Which is right for my car and child, the Chicco NextFit Max or the Diono Radian 3RXT?
That depends on your specific vehicle and child — this page compares published manufacturer specs only, not fit or safety. Check the seat manual, your vehicle manual, NHTSA's car-seat finder and ideally a certified CPST before deciding.

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