Although the Diono Radian RXT has already been discontinued, I will retain this review to demonstrate its comparison with the model that succeeded it, the Diono Radian 3RXT.

Original Review:

Here's a side-by-side comparison of the Diono Radian RXT Vs 3RXT - and older model (RXT) against its newer version (3RXT). Read on.

The Diono Radian RXT Vs 3RXT

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Diono Radian 3RXT is the revamped version of Diono Radian RXT. They share the same core features as shown in the tables below, but the newer version has some interesting changes.

They differ from one another in terms of their names, but let us look at the other factors that differentiate one from the other. These differences might make you decide which one is better.

ideal use

Diono Radian RXT
Diono Radian 3RXT
Rear-Facing Weight:
5 to 45 pounds
Rear-Facing Height:
Less than 44 inches and top of the head is at least 1.5 inches below the top of the headrest
Up to 44 inches
Forward-Facing Weight:
20-65 pounds**
Forward-Facing Height Limit:
Less than 57 inches
Up to 57 inches
High Back Booster Weight:
50-120 pounds
High Back Booster Height Limit:
Less than 57 inches
The child’s shoulders must be at or above the 4th set of harness slots.

**For the Radian RXT manufactured before September 2017, they have higher maximum forward-facing weight limits (80 pounds), but the RXTs made after September 2017 have a 65-pound weight limit.

One main reason to get these seats is that they will allow you to have your baby seated rear-facing for as long as possible. The longer a child is rear-faced, the safer they are.

They are two of the few car seats that can have your child seated rear-facing the longest.

Although it states that it is for children as young as five pounds, I feel they can be too upright for newborns. The lack of reclining function would mean that your child’s head can fall forward especially for those who don’t have proper head and neck control yet.

will it fit in my car?

Diono Radian RXT
Diono Radian 3RXT
17 inches
28.5 inches
Depth / Length
16 inches

While reclining it more will achieve a “safe” degree of recline for young babies, note that doing so will mean more vehicle space length-wise. Its height is 28.5 inches by default. Add the amount of recline you need to do and you will have the front seat across it moved all the way to the front.

If you have a large vehicle, that might not be a problem. However, take note of it if you have a small vehicle. It may be narrow, yes.

But installing it with the proper recline rear-facing mode will need all the space it can eat if you are using it for younger babies.

For older children who can sit more upright, a seat angle adjuster* can help raise the seat so it doesn’t eat up too much space in the rear-facing mode.

Forward-facing, this is probably where you will come to appreciate how much of a space-saver it is.

Size-wise, both Radian RXT and 3RXT are just the same.

Diono Radian 3RXT, 4-in-1 Convertible Extended Rear and Forward Facing Convertible Car Seat, Steel Core, 10 Years 1 Car Seat, Ultimate Safety and Protection, Slim Design - Fits 3 Across, Blue Sky
Price: --
(As of: 2023/09/18 12:52 am - Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on at the time of purchase will apply to the purchase of this product.
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(* = affiliate link / image source: Amazon partner program)

Diono Radian RXT
Diono Radian 3RXT
Do I need to use a pool noodle/rolled towel?
Easy to install Rear-Facing?
Easy to install Forward-Facing?
Easy to Uninstall?
Recline Position:
Lower anchor weight limit:

35 pounds rear-facing

40 pounds forward-facing

Both the new and the old products are installed in the same way. Yet, the changes in the revamped version are worth mentioning.

Colour Coordinated Dots On Rear-Facing Base:

You must align the detachable base with coloured dots to the 3RXT’s coloured dots under the seat. This base must be installed in the rear-facing mode. When you do this, you must make sure that the colour of the dots on the base coincides with the colours of the dots on the attachment.

You can secure the detachable base with a metal lock. It has a curved foot that will slide in between the seat cushion and the backrest.

New Coloured Cut-Out Holes To Show Rear-Facing And Forward-Facing Belt Paths:

In the RXT, belt paths are word-labeled while the 3RXT also incorporated colours to differentiate between the two belt paths. These colours, blue for rear-facing and red for forward-facing, are on the cut-outs of the cover since this cover conceals every component of the seat.

The rear-facing belt path is on the lower portion, while the forward-facing belt path is on the middle side portion of the car seat.

Colour-Coordinated User Manual:

It is good to know that this colour coding is also present in the user manual of 3RXT. Whenever you see blue lining on the manual, the word contents and details are about rear-facing while the red lining shows all the contents are about forward-facing. The yellow lining is for the booster mode.

The manual for RXT may also have coloured linings, but it does not coordinate the colours with the three modes of installation.

New Cover Of 3RXT (Back Part especially):

The new and the old models come with lower anchors, Safe Stop, and top tether all placed in their storage spots at the back of the seat. All these components which were out in the open at the RXT seat’s back are now covered in the Radian 3RXT.

While the cover provides a sleeker look for the car seat, it can be an additional hurdle for some if they ever need to access these components hidden under it. However, the new cover’s design can be easily handled.

If you need to install the car seat with the lower anchors, you must first pull down the flap at the back of the seat cover to access the lower anchor connectors. Release connectors by pressing the red buttons. Unzip the cover at the side and reach at the bottom of the cover to find your needed lower anchor connectors.

When working on vehicle seat belts or lower anchors, be sure they are in through the actual belt path and not just through the colour-coded cut-outs of the seat cover. Make sure you are working on the right colour: blue for rear-facing and red for forward-facing.

Because of the new cover of the 3RXT, the old Diono Radian RXT will be “easier” to install than the new model Radian 3RXT.

New Top Tether:

According to the manufacturer’s response to inquiries at Amazon, one change in 3RXT vs RXT is the new top tether. In some early models of 3RXT, they attached the top tether straps backward. The instruction manual has a section on how you can turn it around.

Tethering is mandatory in the forward-facing. It is not a requirement in the rear-facing, but if the vehicle allows it, you may do so.

The installation method (seatbelt or lower anchors) for the 3RXT or RXT in your vehicle (or if you could even install either in the car) will depend on the car make and model.

According to reviewers, these two seats are difficult to install rear-facing in Honda cars, Dodge Journey or Nissan Titan; but fits well in a Toyota Highlander, 2007 Jetta, and 2014 Ford Fiesta SE hatchback.

If you are like most parents who want to install a car seat in the center seat, but this location has no lower anchors of its own, you may measure the distance between the inner lower anchor connectors of the two outer seats (left and right) of the vehicle.

If the distance is 11 to 14 inches and if your vehicle manual allows it, you could use latch borrowing for installation.

New Glide Adjuster:

The old RXT has a click-ratchet adjustment system while the new 3RXT involves one smooth pull to adjust the harness.

Old users of Diono Radian RXT seats will come to appreciate the new way to tighten the harness straps of the 3RXT which is — just to pull it away, LOL.

Do the crotch/center buckle first and then pull the glide adjuster to achieve the right position of the harness and then secure the chest clip.


Diono Radian RXT
Diono Radian 3RXT
Country of Origin:
Steel Frame:
Five-Point Harness?
Side Impact Tested:
Approved For Airplane Use:
Easy to Buckle and Unbuckle?

This is may not be something new with 3RXT or RXT, but I feel it is worth mentioning the Safe Stop feature of these Radian car seats. Using this “patented, energy-absorbing harness load limiting device” will help parents optimize the safety feature of these products.

In an accident, the Safe Stop can help reduce the impact that might affect the head, neck, and chest of the little passenger.

On the web page of Diono, you’ll read that it is for younger children less than 40 pounds as their neck strength might still be under-developed to support their heavier heads.

Most often than not, many parents who purchase these car seats easily disregard this component or just skip the part about this device when they read the manual.

Not paying attention to this Safe Stop device is understandable, because it is basically a strap that is not installed on the car seat when you unbox. It since is designed specifically for forward-facing.

They even hide it under the new cover of the 3RXT so parents might not really see it and would not be curious enough to explore what this extra strap is for.

Good Convertible Car Seats Of 2023

Consider narrowing down your options by focusing on those made with EPP or EPS foam for impact management. Both materials meet government safety regulations, but EPP foam is more elastic and less brittle than EPS foam, making it better at withstanding multiple impacts and regaining its shape.

Keep in mind that any seat involved in an accident should be replaced, regardless of the foam type.

Good Convertible Car Seats With EPP Foam:

Good Convertible Car Seats With EPS Foam:

the seat

Radian RXT
Radian 3RXT
Is The Material Breathable?
Seat Weight:
28.1 pounds
Machine Washable Cover?
No-Rethread Harness?
Comes with an infant body support?
Yes, Head and Body Support
Easy to Remove Cover?
10 years
Comes with A Cup Holder?
Shoulder Harness Has Pads?
Crotch Pads
Headrest (# Of Positions):
Crotch Strap Positions:
Harness Slot Heights:

Full Wrap Cover:

As mentioned above, the revamped 3RXT has a new cover that fully wraps the child restraint not only at the front (like in the older RXT) but also at the back.

With this new cover, all the components stored at the back, such as straps and accessories, are neatly tucked away, making the backside sleek and tidy-looking.

This new cover features heat-transferred labels because the plastic shell will be completely hidden from view.

Again, there are access panels or cut-outs for forward-facing and rear-facing belt paths. If you order a Radian 3RXT and its cover came wrinkled, you may use a steamer to get rid of the wrinkle.

Some might think the full wrap cover could just be something to make Diono Radian 3RXT unique and more acceptable to the eyes, especially after some of the Diono Radian RXT products were recalled, but this is far more than that.

With the back part fully covered, the vehicle seat would now be protected against damages. The back part that can be visibly seen if the child restraint is installed rear-facing is now pleasing to the eyes because there are no messy parts to be seen.

There are now fewer chances for the straps or accessories stored at the back to get caught on to something.

This full wrap cover has a specific pocket for the user manual. This pocket is found inside the lower left part of the back cover. You can see an indicator on the back cover that says that the manual storage is underneath the cover.

Take time reading the manual, as this will be your handy source of information about the car seat. If you want some visual demos instead, just scan the QR code you might find on the box of Diono 3RXT.


The Diono Radian 3RXT’s “major” changes are the:

  • new wrap cover
  • new color-coordinated dots under the base and on the rear-facing base attachment
  • new colored cut-outs for rear-facing and forward-facing belt paths
  • new color-coordinated linings in the user manual
  • new top tether
  • new easy glide adjuster

It is also now being made in the USA.

The above “changes” may be good at some point, but the major change I feel is a deal-breaker is the full-wrap cover.

Many parents find the old Diono RXT’s ease of installation to be already challenging. The presence of the new wrap cover behind the seat adds challenge to the already tricky installation.

I can say that I’d be just fine dealing with the old RXT despite the lack of “improvements” however, it’s difficult to find it in online stores nowadays, at least as of writing this review.

It is best to use these Diono Radians seats only after your child gains proper head and neck control. It will not need too much recline by then so you can raise the seat with an angle adjuster* so that the space inside the vehicle won’t be a problem even if your vehicle is small.

The lack of reclining function is something unique for this seat, especially that most convertible seats come with 2, 3, 7, or 9 recline positions and even have indicators telling you that your angle is correct for certain weights.

With these seats, they leave you to gauge the proper recline and adjust it accordingly. That makes the tightening of the straps to the vehicle tricky. It can be a tough job sometimes, but with patience, it can be done.

The best use of the Diono Radian RXT and 3RXT is for transitioning your child from an infant car seat to these seats to have them seated rear-facing longer.

These seats' main goal is to have your child seated rear-facing for as long as possible, and you can definitely do that in these seats.

That is something that is not easily found in other convertible car seats.

I highly suggest that you check out the feedbacks of parents who got these seats to help you decide further.

Read The Diono Radian 3RXT Reviews From Amazon*

What do you think?



the diono radian rxt vs 3rxt

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I'd love to know your thoughts in the comments section below!

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  1. Hi! I am looking into purchasing three of these seats for my toddler and twin babies (15 months old) I need to know what the depth of this seat would be from front to back when in rear facing position, and reclined for younger toddlers. I have looked everywhere for this information! If someone here can help I would greatly appreciate it!

    1. Hi Alina,

      The seat pan depth is about 12.5 inches. The seat height is 28 inches.

      Depending on your car, if it has sloped vehicle seats, the tendency of the angle will be more upright.

      In the rear-facing mode, a seat angle adjuster from Diono can help raise the seat so it doesn’t take up that much space.

      I hope this helps.

      Kind Regards,

  2. hi Pitin, we use these Diono Radians for Kidmoto and they are the best seats, hands down. I do not know the details of the Diono voluntary recall but let me throw in some of my 2 cents.

    Latches and tethers are a touchy subject, different vehicle manufacturers place weight limits on both lower anchor latch points and tether points, usually around 65 pounds, which includes the seat and the child. That’s right, you guessed it – you cannot haul your boat by attaching a rope to the baby seat tether point in your trunk, it will pop out. It is not strong enough. This is a good reason why Diono probably made that recall.

    Pitin, it’s just my 2 cents, I could be wrong. Plus everyone has an attorney, especially when they try to tow a boat on tether points.

    1. Hi Nelson!

      I really appreciate you sharing your views and thoughts. 🙂 An open discussion is always welcome in my blog. I am sure if my readers have any objection, they’ll surely leave their thoughts about your 2 cents. 🙂

      Have a nice day!


  3. I am looking at purchasing a Raden TXT model of Diono manufactured in October 2016, is this safe to buy?
    Lot # 16J3


    1. Hi Catherine,

      I hope you mean the Diono Radian RXT. 🙂

      If yes, it’s safe to buy models manufactured after October 2017 and not 2016.

      If it was manufactured before November 25, 2013, then it is not affected by the recall.

      To learn more about the voluntary recall, you can read here from Diono’s official statement.

      I hope this helps. 🙂


  4. My 3rd child is 10 months old and is tall for her age. She has almost outgrown her current rear facing car seat. The law in our state is that children must sit rear facing until age 2. I need something she can grow with and I won’t have to replace again. Your review gave a lot of good information for me to think about. Thanks

    1. Hi Shelly,

      I think the Diono Radian RXT is something that you can use for your toddler until she doesn’t need a car seat anymore. Its generous rear-facing height limit will surely have her seated way past 2 years old. I don’t think you will need another seat after this because of its very high weight and height limits.



  5. Thanks for your comprehensive review and all the related videos! Its so helpful!

    I’ve found it quite overwhelming when looking for a carseat, there are just so many brands and models to choose from when you go into a shop.

    This looks like a goodie as I would like to keep my little one rear facing for as long as I can!

    1. Hi SJ,

      You’re welcome. 🙂 The Diono Radian RXT is one of the best options when looking for a seat that can have your child rear-facing the longest. You can also check the Radian R120 as well as the Radian R100.

      I have also compared the three of them in this link.



    1. Hi Michelle,

      Thanks for sharing. And I appreciate you dropping by my site 🙂

      Not only will you save money in the long run, but you can also have your child seated rear-facing until 44 inches – this is something that sets this seat apart from its competition.



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