Diono Radian 3R Convertible Car Seat

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$429.00 $399.99 including GST
($347.82 excluding GST & international orders)
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Unmatched safety. All-in-one simplicity.

Your child’s security is the top priority. Diono engineered the Radian® 3 R 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® 3 R car seats fit 3-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® 3 r 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® 3 r 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® 3 r 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® 3 R 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

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 38 cm

Folded Depth 18 cm

* Measurements taken without cover on frame.

Customer Reviews

Based on 1 review
Great Seat

Great carseat solid, comfy, easy to install, the 3 yr old is happy.

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