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Diono Radian 3RXT Review (2021): A Luxurious Model with High-End Safety & Features

January 6, 2021 by Sam Webster Leave a Comment

Diono 2019  Radian 3RXT All-in-One Convertible Car Seat, Black

Please click image for more info

In our Diono Radian 3RXT review, we look at another model made by the high-end car seat manufacturer Diono.

If we could sum up the Radian 3RXT in four words, it would be “luxury”, “safety”, “features”, and “narrow” (narrow in a good way). In short, the 3RXT is among the highest-end of convertible car seats, and it shows in the quality of the seat (and its high-end price).

Here’s a quick rundown of this model’s features:

  • The Diono Radian 3RXT is an excellent convertible car seat offering safety, comfort and luxury
  • The Radian 3RXT is one of only a few convertible, high-quality car seats providing parents with the ability to install three car seats in the rear of the majority of mid-sized vehicles. The car seat is an excellent option designed to last for a long period of time.
  • The rear-facing mode is ideal for newborns from five pounds to children up to 45 pounds. The forward-facing mode is suitable for a child a maximum of 65 pounds, and includes a five-point harness.
  • A booster seat conversion is included for older children between 50 and 120 pounds. The maximum height limit for all three modes is 44 inches. The three modes ensure the car seat is capable of growing with the child.
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Quick Navigation
Diono Radian 3RXT Overview
Diono Radian 3RXT Video Overview
Diono Radian 3RXT Specs
Diono Radian 3RXT Features
Who is the Diono Radian 3RXT Most Suitable For?
What is Included with the Diono Radian 3RXT?
Pros and Cons of the Diono Radian 3RXT
Diono Radian 3RXT Installation
Diono Radian 3RXT Manufacturer's Manual
Diono Radian 3RXT vs Diono Radian 3QXT
Xo Livi's Diono Radian 3RXT Review 
The Bottom Line

Diono Radian 3RXT Overview

Diono 2019  Radian 3RXT All-in-One Convertible Car Seat, Black

The Radian 3RXT is an extremely stylish and luxurious convertible car seat. The design includes forward and rear-facing modes in addition to a booster seat to help ensure this is the only car seat parents will need to purchase for their child. Diono has a well-deserved reputation for manufacturing narrow car seats. This enables parents to install three separate car seats to accommodate multiple children.

The design of the car seat takes modern cars into consideration. This ensures the car seat will fit well into smaller vehicles. Parents need to be aware the Diono Radian 3RXT is at the high-end. If the parents are on a tight budget, this car seat is most likely not an option. The Radian 3RXT is an expensive purchase including exceptional safety features, comfort and luxury.


Diono Radian 3RXT Video Overview


Diono Radian 3RXT Specs

  • Rear-facing mode for children between five and 45 pounds
  • Maximum height for the rear-facing mode is 44 inches
  • Weight range for the forward-facing mode is 20 to 65 pounds
  • Maximum height for the forward-facing mode is 57 inches
  • Weight range for the booster mode is 50 to 120 pounds
  • The child's shoulders must be above the fourth harness slot for the booster mode
  • The child should be a minimum of five prior to using the booster mode
  • Without the insert, eight inches is the lowest harness height
  • Top height for the harness is 17 inches
  • The buckle positions for the crotch are two and one-half, five and seven inches
  • Depth of the seat pan is 12.5 inches
  • Width of the seat pan at the child's hips is 12 inches
  • Height of the shell is 24.5 inches
  • Weight of the seat is 24 pounds
  • Top belt guide position for the should belt in booster mode is 17 inches
  • Limit for lower anchor weight is 40 pounds for forward-facing, 35 for rear-facing
  • Area width for internal seating from the shoulders is 12 inches
  • Widest width is near the shoulders at 16.5 inches
  • Expires 10 years from manufacture date

Diono Radian 3RXT Features

Safety Features

  • Diono went to great lengths to make certain the child receives adequate protection in case of a side impact. Parents will also be reassured by the EPS foam installed throughout the entire car seat for shock absorption. This is one of the safest car seats available.
  • The car seat is heavy because it is solid. The Diono Radian 3RXT will keep the child safe in the event of a crash. Installing the car seat requires some practice due to a combination of the weight and the SuperLatch system. The car seat is actually safer because of the extra weight. If the parents intend to use a car seat in more than one vehicle, purchasing a second car seat should be considered due to the weight.
  • The car seat has received FAA approval for airline use provided the five-point harness is in place. Since shoulder belts are not available on aircraft, the car seat is unable to be used in booster mode on airplanes.
  • The Radian 3RXT is constructed with an alloy frame made of steel. This is the reason the car seat is both solid and heavy. The frame makes certain the car seat is also secure and strong. The car seat includes EPS foam for energy absorption, and sidewalls reinforced with aluminum for added safety. Extra protection and comfort are ensured with an adjustable head support. The child is supported with a five-point harness in both the forward and rear-facing modes. The final layer of security is provided by the rear-facing tether.
  • The car seat includes both body and head support for newborn babies. The Radian 3RXT is suitable for five-pound babies.

Convertible Car Seat Features

  • The weight range for the rear-facing mode is between five and 45 pounds. The weight range for the forward-facing mode including the five-point harness is a maximum of 65 pounds. The booster mode can be used for children between 50 and 120 pounds. The maximum height for all modes is 44 inches.

Design Features

  • Two of the best advantages of the car seat are the longevity, and the ability to install three car seats side by side in the back of the vehicle. The Diono 3RXT is ideal for families with three children encompassing a variety of ages. Most vehicles are large enough to install three car seats in any combination of the forward and rear-facing or booster modes due to the narrowness of the Radian 3RXT.
  • The fabric covers are high-quality, comfortable and stylish. A memory foam base is included in the seat to ensure the comfort of the children. The fabric is available in five different colors to allow for personalization for multiple children.
  • The cover of the car seat is removable. Parents can place the cover in a washing machine with mild detergent on the gentle cycle using cold water. The cover needs to dry while laying flat and is not suitable for the dryer.
  • The fabric cover for the car seat back is new. This provides the Radian 3RXT with a sleeker and cleaner appearance.
  • The premium knit fabric is a plush interlock for comfort. The fabric is available in black mist, black scarlet, black cobalt, black plum and Essex colors.

Installation Features

  • Not only is the car seat narrow, but it is one of the narrowest car seats currently available. At just 17.5 inches in width, the car seat is an excellent option for narrow spaces, or parents requiring multiple car seats.
  • The Diono Radian 3RXT provides storage for the manufacturer's manual in the back cover inside of a pocket. The back cover of the car seat indicates where the manual is located.

Usage Features:

  • The car seat offers an exceptional expiration of 10 years past the manufacture date. This date is located on a label placed on the back of the seat, on the right side near the top, and beneath the cover.
  • The car seat is adjustable for every child. An infant insert is included for newborns to ensure the baby has the additional padding required. If the baby is a minimum of five pounds, the insert, and the harness can be adjusted easily to make certain the fit is secure and snug. Once the child reaches preschool age, parents can remove the insert, and adjust the harness for growth. 

The adjustment available for the top harness is 17.5 inches. When the car seat is in the front-facing mode, the weight limit is higher. In this mode, the car seat is appropriate for a child a maximum of 80 pounds. This is ideal for a child between the age of five and six. The booster mode accommodates the child from age six to seven. At this point, the vehicle seat belt is used to add additional traveling safety.

  • The Diono Radian 3RXT folds flat, to provide the parents with simple and easy compact storage.

Who is the Diono Radian 3RXT Most Suitable For?

Diono 2019  Radian 3RXT All-in-One Convertible Car Seat, Black

The car seat is suitable for different heights and weights depending on the mode selected. The rear-facing mode can be used for new babies only five pounds until the child is 45 pounds. The forward-facing mode includes a five-point harness for children a maximum of 65 pounds. The booster seat is designed for a child from 50 to 120 pounds. The height limit for all three modes is 44 inches.


What is Included with the Diono Radian 3RXT?

The car seat includes a removable cup holder, and an infant insert with two sections. Additional accessories are available separately.


Pros and Cons of the Diono Radian 3RXT

Pros

  • Proven manufacturer safety record
  • Back cover available in a wide selection of colors
  • Steel frame
  • Harness tightening with just one pull
  • SuperLATCH connectors and installation
  • Safe Stop harness system
  • 10-year expiration
  • Folds flat
  • Low profile sides
  • Both belt and latch fittings
  • Narrow width enables installation of three car seats
  • Rear-facing tether is included
  • Includes EPS foam for energy absorption, comfort and safety

Cons

  • Adjustments are obscured by the seat back cover
  • Passenger legroom in the front of the vehicle is limited
  • To change the height, parents must rethread the harness straps
  • Only one recline angle in the rear-facing mode
  • Heavy
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Diono Radian 3RXT Installation

Tutorial installation videos are available at:


Diono Radian 3RXT Manufacturer's Manual

The manufacturer's manual is available at:

Click to download Diono Radian 3RXT manual here.


Diono Radian 3RXT vs Diono Radian 3QXT

Diono 2019  Radian 3RXT All-in-One Convertible Car Seat, Black

VS

Diono 2020 Radian 3QXT Latch, All-in-One Convertible Car Seat, Red Cherry

The Diono Radian 3RXT is part of a series of convertible car seats to make the life of the parents easier. The Radion series was designed so parents could install three car seats in the rear of the vehicle safely and comfortably. Infants can use either model from the time they are born until approximately the age of 10. This eliminates the need for parents to purchase more than one car seat per child.

Both models are similar with just a few differences including shape, and the type of infant insert. The biggest difference is the steel anti-rebound bar for the rear-facing mode is not included with the Radian 3RXT. The Radian 3QXT accommodates children from four to 50 pounds, while the weight range for the Radian 3RXT is between four and 50 pounds.

If there is a premature baby, the difference in weight is important. The Radian 3QXT includes a newborn wedge, extended sidewalls, and a steel core missing from the Radian 3RXT. The Radian 3QXT has received more aggressive testing for 2x impact force, rear impacts, and rollovers than the Radian 3RXT. Since both models are made by the same manufacturer, there are also a lot of similarities.

Both models allow three car seats to be placed side by side in an average-sized vehicle. Both also offer the quality of Diono. Both models are manufactured using dual spines to ensure comfort. The Radian 3RXT and 3QXT provide memory foam, a cup holder, 12 positions for the headrest, low seats, side impact protection and an anti-slip harness.

Although the child will be very comfortable in the Radian 3RXT, the car seat does not offer the latest technology available with the Radian 3QXT. Both offer comfort and a safe ride, but the Radian 3QXT provides a slight edge regarding safety. Parents will be pleased with the features, benefits, and safety provided by both models.


Xo Livi's Diono Radian 3RXT Review 


The Bottom Line

The Radian 3RXT offers parents an excellent safety record nearly impossible to beat and dependability. For parents with three children, the option to install car seats in the rear of the vehicle for all three is ideal. The car seat will grow with the child, effectively eliminating the need to spend more money on another car seat later on. This ensures the Radian 3RXT is a cost-effective purchase.

Parents can continue using the same car seat until the child reaches 120 pounds or surpasses the height limitations. The installation is fairly simple due to the UAS connectors. Keeping the seat cover clean is easy because it can be removed. Parents interested in quality, safety, comfort, and luxury should seriously consider purchasing the Diono Radian 3RXT.

Diono 2019  Radian 3RXT All-in-One Convertible Car Seat, Black

Radian 3RXT (click image for more info)

Click Here for Best Price

Sam Webster

With two kids of my own, I’m passionate about child safety! I’m a research nerd who’s on a mission to make the world a safer place for kids – starting with car seats!

To contact me directly please click here.

Filed Under: Diono

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Hey! I’m Sam, mom of Sadie and Xavier.

When I started searching for a convertible car seat I was overwhelmed by the choices out there.

But being a research nerd, I relished the challenge of finding the best seat for my needs. And in the process, I gathered a ton of info!

Read More About Me

SafeConvertibleCarSeats is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. As an Amazon Associate we earn from qualifying purchases.

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