Radian 3RX Convertible Car Seat

by Diono

Radian 3RX Convertible Car Seat

by Diono


SKU DI-55014

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The Diono Radian 3RX is the original slim fit 3 across all-in-one convertible car seat, designed to protect from birth to booster seat (5-120 lbs). Featuring 12 position adjustable head support, extended rear-facing up to 50 lb and steel reinforced frame, expect 10 years of safety from just one car seat.

The Radian® 3RX is designed and engineered to keep your child rear-facing for as long as possible up to 50 lb. The infant head and body support provides extra comfort in the early stages and can be easily removed as your infant transitions between rear and forward facing. As your child grows, the aluminum reinforced headrest can be adjusted to one of 12 positions for safety up to 57” tall.

Built with a mechanically engineered, reinforced steel frame, made from automotive grade high strength steel, the Radian® is always ready to shield and protect. And when your family grows, the slim-fit design will fit 3 across in most vehicles without compromising child safety or passenger comfort.

The SuperLATCH™ system makes installation easy and super secure. For added parent convenience, the Radian® 3RX features hard-wearing, easy remove covers. So, when the next journey gets messy, easily remove to machine wash. As travel car seat experts, Diono have naturally built in super portable features to the Radian® 3RX with original fold for easy transport and storage and a steel reinforced cup holder to store essential road trip drinks and snacks. The Radian® 3RX is also aircraft certified (FAA approved), so you can take safety with you wherever you go.


  • 12 Position Headrest: Creates a safe and comfortable fit for rear facing, forward facing and booster seat modes.
  • Infant Head Support Liner: Features padded support for added comfort. Simply remove as your infant transitions from rear-facing to forward facing booster seat.
  • 10 Years One Car Seat: From rear-facing to forward facing Radian 3RX adapts as your child grows from birth to booster. Suitable from 5 – 120 lbs
  • Slim Fit 3 Across: Ultimate passenger comfort with spacious design but only 17” wide to fit 3 across in most midsize vehicles.
  • Rear Facing For Longer: Designed and engineered to keep your child rear-facing for as long as possible up to 50 lbs
  • Steel Reinforced Frame: Mechanically engineered, reinforced steel core, made from automotive grade high strength steel to shield and protect.


  • Product Height: 28.5" 
  • Product Width: 17.0" 
  • Product Depth: 16.0"
  • Product Height - Folded: 28.5" 
  • Product Width - Folded: 17.0"
  • Product Depth - Folded : 7.1"
  • Seat Weight: 28.1 lbs
  • Minimum User Weight: 5 lbs 
  • Maximum User Weight: 120 lbs 
  • Minimum User Weight - Rear Facing: 5 lbs
  • Maximum User Weight - Rear Facing: 50 lbs
  • Minimum User Weight - Forward Facing: 22 lbs
  • Maximum User Weight - Forward Facing: 65 lbs
  • Minimum User Weight - Booster: 40 lbs
  • Maximum User Weight - Booster: 120 lbs
  • Minimum User Height: 18.1"
  • Maximum User Height: 57.1"
  • Recommended User Age: 0-120 Months

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