Meet Radian 5

For wherever life takes you

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Diono's Multi-stage Car Seat

Don’t sacrifice safety for fit
At just 45cm wide, radian 5 provides enhanced side impact protection with aluminum reinforced side walls and reinforced, adjustable head support while saving back seat space vs. some leading competitors. A few centimeters here or there might not sound like a lot, but it could make the difference between a secure 3 across installation or failure to fit all the seats your precious cargo needs.

Family friendly, award-winning combination seat.
Multi-award winning since it entered the market in 2016, Radian 5 is rated among the top narrow car seats & recommended multi-stage seats for parents looking for extended rear facing. Slim profile combination car seats help parents maximize usage by transitioning from rear to forward facing with ease and stretching a single investment over a 10 year product lifespan.

Diono doodle artwork

Safety Innovation Wrapped in Comfort
Radian 5 allows for harness usage to 25kg. Plus the unique steel frame and best EPP foam combine to provide the ultimate in side impact protection. Our patented Safe Stop® harness component is a load-limiting device that absorbs energy in a crash. The unique design offers an additional layer of protection by reducing impact to a smaller, forward-facing child.

Diono seat belt doodle

Side Impact Protection
We’ve got your child’s safety covered. Radian 5 seats feature deep, aluminum reinforced sidewalls that extend straight forward and are lined with thick, energy absorbing foam. We performed rigorous side impact testing to achieve the proper size, shape and strength that best protects children from side impact forces.

Radian 5

Extended rear facing to 25kg

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Parents Love Diono

Over my years as a mum, I've tried out quite a few different car seats and this is definitely my favorite so far.

Molly, BabyCentre vlogger

So, all in all this Diono Radian 5 car seat is 10 out of 10, 5 stars, two thumbs up. Can't knock it at all. It's the best car seat we've ever had. Brilliant.

Luke, Blended Parent Network

A Combination Car Seat Like No Other

Join the #RadianRevolution

Radian 5 provides ultimate protection with extended rear facing capacity and longer 5 point harness use when forward facing.

Your child will be cocooned in comfort. EPP foam padding, expanding sides and extendable head support mean Radian 5 is customized to fit your child at every stage.

Easy care fabrics make daily use a breeze – even when life gets messy.

Group: 0, 0+, 1, 2

Universal: Birth – 18kg

Semi-Universal: 15 – 25kg

Width top – 45cm
Width bottom – 41cm
Height – 74cm
Depth (unfolded) – 39cm

Vehicle Fit Guide

Fit Guide PDF Fit Guide RTF

Parent Reviews

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Lifetime Warranty

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Approved for Airline Use

TUV Certificate

Installation Guide

Radian 5

What You Should Know About Extended Rear Facing

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Popular Rear Facing Car Seat Bundle

Radian Angle Adjuster


Easy View Plus Baby Mirror

Easy View Plus™


Perfect for rear facing

Total Bundle Price

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