Diono radian rXT Convertible car seat Review

Review of: Diono Radian rXT

Use: Keeping Kids Safe while you Drive

We Like

  • Fully adjustable to grow with your child, preventing the need for another seat
  • Narrow width makes it fit into any seating situation
  • Sturdy build ensures your child is safe in the event of an accident
  • Allows for tethering in rear-facing mode, adding additional safety and support
  • Very comfortable and well padded

We Don't Like

  • It is very heavy, weighing over 26 pounds, making it difficult to carry
  • Installation is tricky and can be challenging in some vehicles
  • Can take up a large amount of front to back space in rear-facing mode


The Diono Radian rXT is an excellent all in one car seat with many advantages. It has some great rear-facing safety features and is fully convertible so it can grow with your child. Once installed, it takes up less width space than many of its competitors and easily fit into any seating situation. Its sturdy, high-quality construction makes it an excellent choice and a solid investment in your child’s safety.

Product Description

A car seat is one of the most important purchases you make as a parent. Your child will spend countless hours in the car with you, and their safety is of the utmost importance. The Diono Radian RXT is a compact car seat with excellent safety features. This adjustable model can grow with your child from the earliest days of a newborn infant through the toddler years and right up until elementary school.

The Diono Radian RXT is an all in one car seat with convertible options. The benefit of a convertible car seat is that it can be used as a rear-facing seat, front-facing seat, and booster seat. This is what makes the Diono car seat such a smart buy for parents. It grows with your child, continuing to provide them with the safety and security you want when they’re in the car.

In addition to its superior convertible features, this all in one car seat has some great safety features, is easily adjustable, and offers numerous convenience features too. The seat has a narrow profile that makes it a perfect fit for just about any seating situation. It will work on a plane just as well as in the car, making it the ideal pick for travel too.

RELATED: Our complete review of Britax car seats

Safety Features

FULL STEEL FRAMEWhen considering a car seat purchase, safety features should be at the top of your list. The Diono Radian RXT doesn’t disappoint when it comes to safety. Some of the key safety features of the Radian include:

Full Steel Frame

Made with a steel alloy frame, the Diono Radian RXT has a strong, sturdy build that will withstand the force of a collision. Not only will it protect your child in the event of an accident, but this framing ensures the car seat will stand up to daily use for years and years.

Unique SuperLATCH

Radian RXT is constructed with a SuperLATCH feature that enhances safety and makes installation easier. The latch feature is made of heavy-duty, collision resistant materials and can hold a rear-facing weight of up to 35 pounds or a front-facing weight of up to 40 pounds. This connection feature lets you easily install the seat, but once your child reaches the weight guidelines the car’s seat belt should be used.UNIQUE SUPERLATCH

Safe Stop

Built to work with the SuperLATCH, the Safe Stop feature helps limit the load when the Diono car seat is being installed. It is designed to add additional protection for children under the 40 pound limit of the SuperLATCH. The Safe Stop simply attaches to the splitter plate and helps tether the car seat for stability and security in the event of a crash.

NCAP Crash Tested

The Diono Radian RXT is fully crash tested for safety in the United States and Europe. These tests ensure Radian RXT can withstand even a severe crash while protecting the child strapped inside. Only a seat that passes the NCAP’s rigorous testing is deemed safe for children. The Radian has been tested even beyond the requirements in the U.S. and has been shown to withstand an impact force higher than most seats available on the market.

Airplane Certification

Radian RXT is certified by the FAA for use on airplanes. Its excellent safety and security measures make it ideal for use on a plane and will ensure your child is seated safely on any flight. Its full steel frame and secure harness make this Diono car seat an excellent choice for travel.

Easy Adjustments

When purchasing a convertible car seat, you want one that can easily be adjusted as your child grows. With its easy adjustment options, the Diono Radian RXT meets that requirement. Some of its standard adjustment features include:

5 HARNESS5 Harness Height Positions

With more slot positions than many of its competitors, Radian RXT provides the height adjustments necessary to truly grow with your child through infancy and into the booster seat years. With five separate height positions, the seat can easily be adjusted to fit most children.

Recline Adjustments

The Radian model has two adjustable reclining positions for use in a front-facing installation. This gives you the ability to adjust the seat for your child’s comfort. When installed in a rear-facing mode, a separate foot holds the seat in place and prevents reclining to ensure your infant or younger child is properly positioned.

Rear-Facing Tether

The tether can be used when the seat is installed in a rear-facing mode, adding security and increasing your child’s safety. The tether is adjustable and can be connected to the metal rings most modern cars have in place for car seat tethering.


In addition to offering excellent safety features and adjustability that lets you customize for your child’s comfort and proper installation, the Diono Radian RXT offers top of the line convenience features. This makes it easy to use and eliminates some of the normal car seat woes you hear from parents. Some of Radian RXT’s best features include:

Fits 3 Across

FITS 3 ACROSSThis is a lifesaver if you have multiple children or a small backseat. The Radian has a narrow width making it fit easily into any seat and allowing enough space to seat two more people or children beside it. You can even install three Diono car seats in the same back row because of its clever design. This narrow profile also makes it ideal for traveling because it will easily fit into any airline seat.

Memory Foam Padding

memory-foam-paddingThe added comfort of memory foam padding means your child is both safe and comfortable when in the car or airplane. This is especially important on long trips and can greatly reduce the amount of complaints. The padding holds up well over time too, so you can count on it to continue to support your child for years.

Infant Support Cushions

Radian RXT comes with infant support cushions that ensure your baby is properly positioned and can be removed as your child grows. The head cushion helps keep them angled properly, and the body cushion offers comfortable side padding to cradle them in the seat.CUP HOLDERS

Cup Holders

This seat comes with a convenient cup holder that is sized appropriately to hold cups or snack containers. There are additional slots available to add another cup holder if desired.

Installation Instructions

As with any car seat, installation can be a bit tricky. The SuperLATCH system helps overcome some of the installation problems but has a weight limit. Once your child reaches that limit, seat belt installation is required. In a rear-facing installation, you may need to twist your vehicle’s buckle stalk to shorten it so you can properly maneuver the seat into position. Rear-facing installation can be used until your child reaches the 45-pound weight limit.

In a front-facing installation, it may be easiest to open the slits in the seats cover to aid in maneuvering the car’s seatbelt through the proper path on the Radian’s back side. Once the belt is in place, you can secure the seat’s cover and the seat is ready to go. The front-facing installation can be used with children weighing between 20 and 80 pounds.

Installation as a booster seat is the easiest mode, but is only appropriate for children who are over 50 pounds and taller than 57 inches. For this mode you just need to set the booster in the seat and use the car’s seat belt to properly strap them in as you would yourself. And last you can download Radian rXT User Manual here.

What's New?