Diono radian® 3R Convertible Car Seat

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$429.00 $406.99 including GST
($353.90 excluding GST & international orders)
Or 10 interest free payments from $40.70 with What's this?

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Unmatched safety, all-in-one simplicity!

Your child’s security is the top priority. Diono engineered the radian® 3R with premium, innovative features like a steel alloy frame, aluminum reinforced sidewalls, energy absorbing EPS foam and a reinforced adjustable head support to keep your little one protected and comfortable.

Some say three’s a crowd. We say, the more the merrier! The radian® 3R car seat fits three across in most mid-size vehicles.


  • Joy of the journey: From birth, keep your little one rear facing longer to 18 kg, traveling safely. As they grow to 45 kg (8 years approx.) Diono's long-range lifespan protects your child facing forwards. Peace of mind for you, Diono thought of everything so you don’t have to.
  • Lovingly engineered: The radian® 3R is fabricated using super strong automotive high strength steel, engineered into a dual spine. This unique core manages and dissipates energy and provides an unyielding structure to protect your baby. Diono's audible click SuperLatch system makes installation easy and quick.
  • Three’s not a crowd: For safety that fits 3 across the radian® 3R packs all Diono innovative safety features into a sleek and slim design that allows you to fit three across (in most mid-size vehicles). Now the whole family can travel, together.
  • Business Class comfort: Inspired by the best European fashions, the radian® 3R has bright soft fabric covers and a memory foam seat bottom. Lined with energy absorbing foam, comfort and safety go hand in hand.
  • Extended rear-facing: The radian® 3R keeps children comfortably rear-facing from 2 - 18 kg for the safest possible position.
  • Room to grow: Accommodates forward-facing children up to 29 kg in a 5-point harness and converts to booster mode for kids 22 - 45 kg. The aluminum reinforced, adjustable head support and sidewalls provide additional side impact protection.
  • Worth the Weight: Diono's convertible car seats are made from steel for safety you can feel. The fully integrated steel frame is wrapped in thick engineered plastic to withstand severe crash forces. Deep, aluminum reinforced sidewalls provide excellent side impact protection, while energy absorbing EPS foam surrounds your child for ultimate safety. Diono car seats are definitely worth the weight.
  • Safe Stop®: The 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.
  • Rear Facing Tether: As safety experts, Diono think of every precaution. Rear facing tether capability helps reduce seat rotation during an impact. This unique feature is not found on every car seat. Diono built it in here for an extra layer of protection when your child is rear-facing.
  • SuperLATCH™ Installation: Diono's unique SuperLATCH™ system makes installation easy and secure. An audible click and visual indicator let you know when the connectors are locked.
  • Side Impact Protection: Diono have your child’s safety covered. radian® 3R seats feature deep, aluminum reinforced sidewalls that extend straight forward and are lined with thick, energy absorbing foam. Diono performed rigorous side impact testing to achieve the proper size, shape and strength that best protects children from side impact forces.


  • Interior Shoulder Width 33 cm
  • Exterior Shoulder 43 cm
  • Car Seat Height 72 cm
  • Internal Seat Width 38 cm
  • Harness Strap Positions: 20 cm, 24 cm, 29 cm, 36 cm, 43 cm
  • Crotch Buckle Positions: 10 cm, 15 cm, 19 cm
  • Seat Depth Pan 33 cm
  • Total Seat Depth 40 cm
  • Hip Width 31 cm
  • Total Seat Width 43.2 cm
  • Folded Depth 18 cm
  • * Measurements taken without cover on frame.

Customer Reviews

Based on 13 reviews
Diono Radian 3R

Love how easy it is to use. And I love how quick and prompt Winkalotts is. It arrived the very next day which suited my family very well as we are not near any place to buy car seats. Thanks very much!


Ideal carseat for my 3yo, she has even said she loves it too! amazing service, carseat arrived very quick, thank you again!

Love everything!

I love this car seat! I got the pink for my little girl, awesome colour, great fabric, easy to install and easy to adjust straps. I found the strap padding is too bulky for my 8m old but will be great when she is older. I definitely would buy another one of these! Super fast delivery, thanks heaps Winkalotts!


Great carseat and service!

Great value carseat

easy to install and my son loves it.

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