Find Out Which Is The Best Diono Car Seat

Best Diono Car Seats

“We went on a spin ride!”… Little did he know that they were in a severe T-Bone Accident…

Now not all accidents have a happy ending.

The scariest part of a crash is that you are not in control. The protection features take over. You can’t predict accidents. You can only be prepared for them.


As parents, we must keep our little ones safe. I know how hard it is to find the perfect car seat. This is why I’ve created the best Diono car seat article. For an average parent finding the best car seat takes around a few weeks to a month.

There’s such a clutter on the market. You have done most of the work by eliminating other brands and shortlisting Diono. Diono is a Canadian car seat maker who is known for their quality products.

I’ve selected the very best that they offer to help you make the decision as fast as possible. At the moment, Diono caters towards the older children that are why I only have two categories.

By reading this article, you will find out which the best of the best is and which the best convertible car seat from Diono is.

Also, if you stick with me for a bit, I will share with you what happened in the accident mentioned above. Plus, you will know which car seat was tested and how did it perform.

Let’s get this best article started.

#1 Diono Radian 3RXT All-in-One Convertible Car Seat – Best Diono Car Seat

Diono Radian 3RXT - Best Diono Car SeatThis incident happened with some friends of ours.

The father was going on a routine shopping trip with his son. The little boy was sitting quietly in the back.

Everything was the same old, same old until another driver smashed into them from the side.

The van got hit from the driver’s side. The same side where the little boy was sitting. The accident was so powerful that it smashed the side window. The front part of the van was destroyed. The airbags deployed and saved the father’s life.

The little boy wasn’t hurt. The Radian did its job, and he got out unhurt.

Diono Radian 3RXT All-in-One Convertible Car Seat won the  Best Diono Car Seat award.

As you have seen in the story about the accident, this car seat delivers. The steel frame kept the little one safe. The engineering team went above and beyond the minimum requirements. It has every safety feature you will ever need.

They have built a cushioned tank. Better yet, it’s bombproof. With all this safety, you are sacrificing weight. This is easy for anyone who wants their child to be protected to the maximum.

Wait for it… there’s more. You would assume that this car seat is meant to be installed in the car and not moved for the years to come. Well, it’s FAA approved, and it’s foldable. So it’s a good travel companion.

The Radian 3RXT is an all in one solution. It can be used from birth until your child reaches 120 pounds. It’s the perfect car seat to take your little one home from the hospital.

In recent years parents demanded extended rear-facing. The Radian heard the request and answered it. You will be able to do extended rear-facing up to 45 pounds.

Besides rear-facing mode, it has harness and booster mode. This will be the only car seat that you will ever need. It’s a lifer. The Diono Radian 3RXT All-in-One Convertible Car Seat earned the award.


Finally, a car seat where the baby isn’t slouching or sliding down

It’s lightweight and easy to move around

It’s soft and padded plus it comes with side impact protection


The gray fabric is not that stain friendly

You can’t remove the fabric the only solution is spot cleaning

#2 Diono Rainier 2AX Convertible Car Seat – Best Diono Convertible Car Seat

Diono Rainier 2AX Convertible Car SeatOur friends were on their daily commute. Their son was riding in the back.

When they crossed the intersection, they got rammed by another car. The impact was deafening. There was so much energy during the crash that their car did a 180. The door got banged up and twisted. The side window shattered into a million pieces.

The little boy was scared and cried a bit. Other than that, he didn’t get injured. His mother wasn’t so lucky she had a shoulder injury that needed medical attention.

Diono Rainier 2AX All-in-One Convertible Car Seat won the Best Diono Convertible Car Seat award.

Diono is known as the Cadillac’s car seats. If you want a car seat that stands out from the rest, you have found the perfect one. Take a look at the color combinations. Say goodbye to those gray and boring black seats. There are so many vibrant colors to choose from.

Besides the looks, it’s one of the safest car seats you can get. It has a steel frame, and it has the best side impact protection I’ve ever seen.

Brace yourself this car seat is huge. It’s not meant for compact cars. The front row will suffer otherwise. Guess what? It has a narrow profile. So it’s possible to do 3 across.

Related: Which car seats can fit 3 across?

The main reason why parents choose this car seat is the extra mileage that it offers. If you’re among parents who value extended rear-facing, you have found the perfect car seat. The Rainier’s upper limit is set to 50 pounds.

Now it’s recommended to keep your little one in rear-facing mode until they reach their second birthday. In other countries in Europe, the minimum is four years. It’s a common fact that this mode provides the best protection for kids.

Did I mention it’s cool?

The Diono Rainier 2AX All-in-One Convertible Car Seat deserves the Best Diono Convertible Car Seat,


It’s the most protective car seat from all the Diono car seats

It supports extended rear-facing, and it has a lot of legroom for long-legged kids

The car seat gives you a lot of mileage from 5 to 120 pounds


In rear-facing mode, it takes up a lot of room in smaller cars

It’s tricky to install if you haven’t watched the videos

Also read: Top car seats for 4 year olds article

Buyer’s Guide:

At the moment, Diono only makes a handful of car seats. For example, they don’t have an infant carrier in their roaster, so I had to skip that category. This was the short best article. Let me make it up with a quick buyer’s guide.

I know that there are so many features that you can’t wrap your head around it. I’m reviewing a bunch of car seats, so I had to make my own system so I can keep everything consistent. Here’s my system, and if you like it, you can copy it and put it to good use.

Before we get to the actual guide, let me share with you two hot tips.

The first thing you have to decide is the place where you’ll mount it. The safest place is in the middle of the vehicle. Now that’s not doable for most, so here’s the second safest place.

This is located right behind the driver. My second hot tip is about the installation. If you can’t get it installed correctly, then it won’t be able to provide you with the best protection possible. According to a recent survey, 75% of car seats in the US are mounted badly.

If the seat is not tight enough, then it can’t provide the needed protection. Now with Diono, you have a bit of work cut out for you. Get some practice under your belt, and you will get it tight every time. Just to be on the safe side, you can always ask for a second opinion from a licensed professional.

Here’s my go-to checklist when it comes to a new car seat.


This is the most important thing you have to check out. Here’s the truth. All car seats are safe on the market because they have passed the government standards. Now there’s something that is kept from you. Not all brands are equal.

Some barely pass the test while others go beyond. Which car seat would you like to protect your child?

When I think of Diono, the first thing that pops in my mind is that they have over-engineered it for safety. It has everything you will ever need. Starting with the steel frame and having the best side impact protection around.

Just look at the seat; it looks like a tank with cushions.

Size Limits

This is the place where I tend to save money. Best of all, I don’t compromise on safety. The secret lies in longevity.

The more you can use a car seat, the more money you’re saving. Best of all, these two Diono car seats are lifers. Once you get either of them, they will stick with you until your child doesn’t need it.

One more important thing to consider over here is the ability to do extended seating. As you know, the safest mode is rear-facing for kids. This provides the most protection possible. After that, the harness mode provides the second-best protection for older kids.


This category is the one where many brands fail. Some are so darn hard to get tight.

Here’s a super tip that will save you a bunch of frustration. The one-inch wiggle room should be measured at the connection point. Either going with the seat belt or the latch system, you should measure the movement where it’s closed to the seat.

You won’t be able, and you shouldn’t try to make it so tight that the seat won’t move on the far side. It wasn’t designed like that.

Convertible car seats have two install options front and rear-facing. Check the guides to see which the right one for your child is.


This is the last important item on the list. Let’s face it. We’re talking about kids, so they will bound to make a mess or have an accident. So this is why it’s important to know ahead of time how easy it is to remove the cover and how you can wash.

No matter which Diono you pick, they are both easy to wash, and they are machine friendly.

This would be my buyer’s guide. There are many tiny things that I didn’t include, so I won’t bore you. If you like, it put it to good use.

 Related: Top car seat for 3 year old boy


We have reached the end of the best Diono car seat article. I hope it has helped you make your mind up. By now it should be clear which one is the best fit for you.

Now it’s your turn to take action. Last time I’ve checked, the stocks were low, so get them while you can.

If you have tips or ideas, you can share the below.

Frequently Asked Questions (FAQ):

Are Diono car seats good?

Yes, Diono car seats are good. They are one of the safest and they have narrow profiles so you will be able to do 3 across with ease. Plus they have an insane color combination.

What is the difference between the Diono car seats?

Diono have only a few car seats on the market. There’s only a small difference between the Radian and Rainier if you want to check it out read my full Radian vs Rainier comparison. These are all in one car seats. So the main difference would be the weight and height difference.

What is the safest car seat on the market?

The safest car seat on the market is the Britax Advocate with 3 layers of side impact protection.

What are the weight limits for these Diono convertible car seats?

For the Diono Radian 3RXT convertible seat, the weight limit is 120 pounds. The same goes for Diono Rainier 2AX it’s limited to 120 pounds. The rear facing weight limit is 40 pounds. The weight range for the Rainier is 5 to 120 pounds. The seat weight for the Diono Radian 3RXT is 30.6 pounds while the seat limit for the Rainier is 15.26 pounds.

What are the safety features of these Diono booster seats?

Since it’s a booster seat it means you get to keep your child safe for longer. They have the highest safety standards form them all.  The diono radian rxt comes with the superlatch system and has passed the crash test. The side walls are soft and deep at the same time. There’s great head support. Keep in mind to install it on the back seat for your child’s safety. Other safety features include side impact protection and energy absorption, top tether and latch connectors. Plus Diono is known for its ease of use. For comfort, there’s memory foam.

How do you install the Diono high back booster seat?

The high back booster seat can be installed forward-facing only. Also, you can use the latch connectors or the vehicle seat belt. The ease of use is evident. Make sure to consult the manual and your child is sufficient years old to ride in it. Keep in mind that the rear-facing position is up to 40 pounds.

What other features does the Diono booster seat have?

It has dual cup holders and the Rainier has double cup holders as well. Great head support and memory foam plus comfy side walls.

Which car seats would be good alternatives for Diono car seats?

There are many good child car seats on the market today. Here’s a shortlist to choose from: clek fllo convertible car seats, monterey xt booster seat (backless booster and high-back booster seat), radian 3r all-in-one convertible car seat. The beauty of clek fllo child car seat is that it’s an infant seat as well. Most Diono car seats can be used as infant seats however clek fllo is known for their ease of use as an infant car seat.

Can you fit three across these best Diono car seats?

Yes, these Diono car seats allow you to do 3 across since they have a narrow profile. Before you order make sure that you measure the car’s width interior. Also make sure you check the manual and the installation videos before you install. Finally asked for help from a child passenger safety technician if you’re stuck.

Are these best Diono car seats safe?

You can’t go wrong with these convertible car seats. These car seats come with all the safety that is needed to keep your child protected no matter how many years old. When it comes to the safety rating Diono is #1 among car seat manufacturers. These seats come equipped with EPS foam, memory foam and full steel alloy frame and aluminum reinforced sides. Plus the easy installation makes this car seat a no-brainer. The EPS foam means that it will absorb car accident energy. This means that in case of a crash your little one’s body won’t feel the forces thanks to the EPS foam. The rear-facing position is much easier for infants. This is why Diono car seats are used as infant car seats but as all in one car seats as well. The steel alloy frame will keep your child protected no matter what. The head wings aren’t for just show they provide head restraint and head control. Your child will be kept safe by the 5 point harness adjuster. Just to recap the memory foam is for comfort the EPS foam is for impact absorption and the steel alloy frame gives the best protection possible when it comes to child safety.

How easy is it to clean these best Diono car seats?

These Diono car seats are known for their ease of use. It means that the seat cover can be easily removed and cleaned with the washing machine. After the seat cover is dry it’s easy to install on the seat. If you want long-lasting seat cover used cold water and a gentle program. It has a rubber base so there’s no slipping. The no slip rubber base is worth every penny.

How comfortable are these Diono car seats?

These Diono car seats are super comfy no matter the age. They can be used as convertible car seats and highback booster seats. The headrest positions can be adjusted. The only issue is that the harness straps don’t auto adjust after adjusting the headrest positions. These convertible car seats come with recline angle options. Thanks to the angle adjuster your child will ride in comfort. There’s no additional leg rest but it’s easy to install.

Are these diono car seats easy to install?

Yes these convertible car seats are easy to install. You can use the seat belts or the latch system as well. Diono is known for the superlatch system. When you hear the click sound you know that these convertible car seats are tightly installed. In forward and rear facing you can both use the lower anchors and the lap belt.

What so special about the diono radian car seats?

The Diono radian slimfit convertible car seat is one of a kind. First of all it provides the ultimate protection during a car crash, there’s minimal or no head slump what so ever. The diono convertible car seats can be installed on the back seat both in rear facing and as a forward facing seat there’s a newborn travel high wedge included. The diono radian has multiple uses like: backless booster seat, rear face convertible seat, booster mode, and it was lovingly engineered by the diono family plus super convenient easy storage for growing families, folds flat by the push of a button, child snug position, comfortable newborn positioning. This is what you need to know about the diono radian line when it comes to safety features: it’s one of the most secure car seat you can buy for a midsize vehicle. The forward facing Diono radian has lived up to the nhtsa safety standards because it has: energy absorbing foam, memory foam seat, steel frame that forms a dual spine, two retractable cup holders, a steel core, aluminum side walls, adjustable headrest, easy installation, fabric cover washable, infant insert, latch anchors, unique superlatch system with audible click, slim fit design and more space. You can use the diono radian for a very long time especially in backless booster mode.

How good are diono convertible car seats?

The diono convertible car seats are top of the line. They have seriously improved from the previous model. They have a bucket seat design and in forward facing mode they ar not a crowd while having 3 in a row. It can accommodate children from a big age range. Plus it delivers occupancy space for your growing child. You will be able to travel safely with an older child in most vehicles (most cars). All the seats have been car crash tested.  All in all diono convertible car seats are one of the best seats to go with. Here are a few considerations before buying: energy absorbing foam, steel frame, adjustable headrest, front adjusters.

Last Updated on October 25, 2023 by Brian Beasley

Written by Linda Reid

Hey there, I'm Linda, a mom of three cool kids. I've tried so many car seats, you could call me a "Car Seat Detective." Searching for the perfect car seat can feel like finding a needle in a haystack, but don't worry! I've committed to researching and reviewing car seats that are super safe, cozy, and great for growing kids. Together, we'll find the perfect car seat that keeps your child safe and cozy, and makes you feel like a super-parent!