Home   /   Radian 3 RX Convertible + Booster Car Seats
ITEM# 54010

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

Share Diono Radian 3RX All-in-One Convertible Car Seat 2019 Black

$269.99Save 26%
In Stock

Coordinating Items
Include the Diono Radian 3RX All-in-One Convertible Car Seat 2019 Black


Your child’s security is Diono's top priority. We engineered our radian® 3rX with premium, innovative features like a steel alloy frame, aluminum reinforced sidewalls, energy absorbing EPS foam and a reinforced adjustable head support to keep your little one protected and comfortable.

Extended rear-facing

The radian® 3rX keeps children comfortably rear-facing from 5-45 pounds for the safest possible position. Premium, plush head and body support cushions are included for newborns and infants.

Room to grow

Accommodates forward-facing children up to 65 pounds in a 5-point harness and converts to booster mode for kids 50-120 pounds. The aluminum reinforced, adjustable head support and sidewalls provide additional side impact protection.

Worth the Weight

Our convertible car seats are made from steel for safety you can feel. The fully integrated steel frame is wrapped in thick engineered plastic to withstand severe crash forces. Deep, aluminum reinforced sidewalls provide excellent side impact protection, while energy absorbing EPS foam surrounds your child for ultimate safety. Diono car seats are definitely worth the weight.
  • Joy of the journey: From birth, keep your little one rear facing longer to 45 lbs, traveling safely. As they grow to 120 lbs (12 years approx.) our long-range lifespan protects your child facing forwards. Peace of mind for you, we’ve thought of everything so you don’t have to.
  • Lovingly engineered: The radian® 3 rX is fabricated using super strong automotive high strength steel, engineered into a dual spine. This unique core manages and dissipates energy and provides an unyielding structure to protect your baby. Our audible click SuperLatch system makes installation easy and quick.
  • Three's not a crowd: For safety that fits 3 across the radian® 3 rX packs all our innovative safety features into a sleek and slim design that allows you to fit three across (in most mid-size vehicles). Now the whole family can travel, together.
  • Business Class comfort: Inspired by the best European fashions, our radian® 3 rX has bright soft fabric covers and a memory foam seat bottom. Lined with energy absorbing foam, comfort and safety go hand in hand. A tailored infant support cushion and a cup holder are included.
  • Made of Seattle: We are from Seattle, a city where being different is the norm and so is the radian® 3 rX. It folds flat, so you can travel the world and is FAA approved for use on an aircraft. You don’t need to change your plans just because baby is in tow.
  • Dimensions (in): 16 L x 17 W x 28.5 H

out of 5.0
122 Reviews
Ratings Snapshot
5 Star
80% (97)
4 Star
17% (21)
3 Star
2% (3)
2 Star
1% (1)
1 Star
0% (0)
of Reviewers
Solid, easy to clean, lasts for a long time
By Sam
from Virginia
on April 7, 2022
Verified Buyer
This is our main seat for our 4 year old. Rear-facing install can be a pain, but is usually do-able. Definitely get the angle adjuster! Forward-facing install is pretty simple and easy. We've had to wash the cover quite a bit and it's held up well overall. It's also a narrow seat, so good when you need to fit several kids.
Worth the Purchase!
By Kelsey
from Grand Rapids, Michigan
on March 14, 2022
Verified Buyer
I love this car seat! We originally had a Graco 4ever seat for our oldest, and switched to this after the birth of our twins. This makes it possible to have 3 kids in the back of our Honda Cr-V, and no one is cramped or uncomfortable. We recently used this car seat on an airplane, and navigating the plane with a toddler and this seat was as easy as that could be haha! Would buy again, and would recommend this to all parents.
Nice car seat
By Jessica
from burton, Michigan
on February 22, 2022
Verified Buyer
My 4 year old and 2 year old love these. The harness is easy and smooth to tighten.
Great for tight space
By Erica
from ND
on February 4, 2022
Verified Buyer
Great for tight spaces, a little tricky to install with all diono's rules. Large front to back.
Great for tight space
By Erica
from ND
on February 4, 2022
Verified Buyer
This carseat was great for tight spaces! It is quite large front to back, so it didn't allow for my husband to move his seat back to much! But I would still recommend
Best 3 across
By Robby
from WA
on October 7, 2021
Verified Buyer
Best seats for 3 across in a back seat. Fits great and is comfy.
Easy to install
By Tasha
from Iowa
on September 17, 2021
Verified Buyer
Our daughter loves this seat. Comfortable and easy to install. Only con- we couldn€™t figure out how to attach the cup holder.
Compact, solid, simple
By Denise
from Shreveport, LA
on September 12, 2021
Verified Buyer
This car seat is nice and compact to fit in a smaller vehicle, or if you need to get multiple across a row of seats. Feels safe, sturdy, and easy to clean.
  • Slim, easy to install, comfortable fit
Best Uses
  • Small vehicles, if you need 2-3 across one row of seats
  • Instructions were not there for installation or putting together, very heavy
Very good site and product
By Arturo
from North Carolina
on August 6, 2021
Verified Buyer
I buy a couple of this car seats last year.
At the beginning I was hesitant because I didn't know this site before, but the process to buy and the delivery time was great. The car seats arrive without any issue.
This are perfect for 3 in a row. now I have only 2 of this and one Chicco, I'm planning to upgrade the chicco to one of this soon.
  • This in particular don't have any support for the head, I may try other version with head support later.
Will be reselling
from Portland, Oregon
on July 17, 2021
Verified Buyer
I hate this car seat. Based on the product description it seemed like it would be easy to install, but it was the opposite. When it€™s in rear-facing mode it€™s so long that I can€™t put my front seat back very far. It also just doesn€™t seem super safe for younger kids without any sort of padding/protection on each side.
Great seat, not so easy install.
By LC3124
from Long Island, NY
on July 8, 2021
Verified Buyer
It's a great seat, easy to manage getting the baby in and out. However, the initial installation of the seat took forever. My usually handy husband installed other car seats in less than five minutes, this took over an hour. It's just a bit tricky and can be frustrating initially.

Very Wide Front to Back
By Sherry
from Virginia
on June 20, 2021
Verified Buyer
I got this for my husbands jeep and I have a hard time getting comfortable even with the extra lift we bought. Its notoriously heavy and my son doesnt seem to like it as much as our Nuna Rava. I will probably end up getting another Rava.
  • narrow side to side, child can hang legs over the side
Best Uses
  • if you need more the one car seat in a row
  • Wide front to back, heavy, my son doesnt seem as comfortable as in my other car seat
Good for short trips around town
By Sarah
from Bozeman, Mt
on June 20, 2021
Verified Buyer
Love this seat for everyday running around town. We don€™t use it for road trips because my three year old needs the headrest when he falls asleep. We bought the 3xrt model and are very happy with that for longer rides.
  • Slim design. Sleek look.
Best Uses
  • Everyday use
  • No headrest.
Love this carseat!
By Rachael W.
from CA
on June 15, 2021
Verified Buyer
Great carseat. Fits nicely and gives room for someone to squeeze by for the third row seat. Our daughter loves facing front and having her own cupholder.
Works great
By Mike
from Brooklyn, NY
on June 11, 2021
Verified Buyer
Easy to mount and a good size of you have a compact car.
Great price
By Nana
from AL
on June 9, 2021
Verified Buyer
I needed another Diono car seat in order to put 3 grandchildren in the back seat. Albeebaby had the best price. Order arrived on time, exactly as described.
Comfortable & Narrow
By Josh
from New York
on June 2, 2021
Verified Buyer
The Diono seat is very comfortable for our toddler and also allows 3 to sit across (2 car seats and 1 adult)
  • Narrow
Great quality and easy install
By Eddie
from Miami, FL
on June 2, 2021
Verified Buyer
Doesn't get better than Diono!
Great for families with lots of toddlers!
By Diana
from Pasco, WA
on June 1, 2021
Verified Buyer
I have 4 kiddos under 6 years and needed slim car seats for my van. I was excited to find this carseat plus all the extra goodies that came with it! the seat protector is a must!!
Very Sturdy!
By Katelynn
from Brownsville, Texas
on May 22, 2021
Verified Buyer
We love this Diono seat. It is so sturdy and so easy to install.
  • Steel frame
  • Easy to install
  • Easy to adjust
  • Comfortable
Best Uses
  • Best used from birth on
  • Heavy
My favorite carseat
By Kelli
from Montgomery, Al
on May 19, 2021
Verified Buyer
I love these. We have 4 now and they are the best fitting seats! They are so sleek and simple to buckle! I had 3 across easily in my Subaru Outback and now they make getting around them so easy in my Yukon XL. My kids are so much happier in these than the more bulky seats we€™ve had.
Great product and deal
By Chase C.
from Ohio
on May 7, 2021
Verified Buyer
The seat is great. It fits nicely in my truck.
Amazing deal
By Kayla
from Hemet, CA
on April 28, 2021
Verified Buyer
Purchased three of these. We drive a Kia Sportage and needed something that fit 3 across. These are perfect. LOVE that they had this bundle. Saved so much money and it€™s good quality.
Slim and versatile
By Em
from Arlington, Virginia
on April 22, 2021
Verified Buyer
These are great. They have a slim profile and can be folded and worn as a backpack (with straps sold separately). This will make it easy to fly, use on the plane, and use in the car when we get to our destination.
Awesome Package and much cheaper than stores!
By Julian
from THORNTON, Colorado
on April 9, 2021
Verified Buyer
Great package for the car. We already had a few of these items but getting them together for the price is amazing. Kiddo loves his big boy seat and tells everyone about it. Thinking of getting a second one already for the other car.
Love 💕
By Kristy H.
from Rochester, WA
on April 2, 2021
Verified Buyer
Love love love car seats. I wish I would have found these when I first started taking in kiddo Ÿ I love that I don't have but another car seat it grows with. Plus I can put three in my back seat Ÿ˜
By Kerri
from NC
on March 26, 2021
Verified Buyer
Daughter loves the seat. Very slim for easy in/out.
Safe & User Friendly
By Sarah
from Chippewa Falls, Wi
on March 22, 2021
Verified Buyer
We love our Diono carseat! My husband & son were in an accident driving 70 mph. My 3 year old was in Diono on the side that the window was shattered and door was smashed in. My son walked out of the vehicle completely untouched. This is our third seat purchase (2 for 2 vehicles and 1 for replacement from accident). We won't purchase another brand! The material is very easy to remove for cleaning and replace when finished.
Sleek, safe, stylish.
By Annissa M.
from Oregon
on March 20, 2021
Verified Buyer
We love these seats. We purchased two to fit in the back of a BMW and there€™s room for an almost 13 year old too. These seats are easy to install, once you find the hidden book. It€™s inside the fabric shell in a pocket on the backside.
No complaints and I love the high weight/height limits! We will gladly use these for years to come! Shipping was fast and prices were great!
Great deal for this car seat and bonus pack
By Lindsay R.
from Buffalo, New York
on March 12, 2021
Verified Buyer
Extremely fast shipping. Received in less than 48 hours. We already had this car seat and knew we wanted another. I was happy to find this bundle deal. It's a great car seat for our 3 1/2 year old.
Love these for 3 kids!
By Audreanna O.
from Warrensburg, Missouri
on March 11, 2021
Verified Buyer
We have three kids and their seats didn€™t fit the way I liked so we switched to these and it€™s great! I have a Dodge Journey and have two rear facing (ages 14 months and 2.5 yrs) and my FF (5 yrs) in a 5 point harness. I love everything about them!
Customer Images
  • Slim fit, design, color, stylish.
Great sturdy car seat!
By Madison
from Utah
on January 27, 2021
Verified Buyer
I really like this because it€™s not bulky and super easy to fit three along my back row in my car.
  • Compact, sturdy
  • Talk back in rear facing
Overall a good carseat
By Philip
from LA
on January 16, 2021
Verified Buyer
I like the car seat you buy it . We had trouble finding a car seat that would work with our Ford airbag seat belts. We looked everywhere to see what would work with our car. I finally called a local baby store and they said this brand would work with the car seat belts. It does take up a little too much room rear facing though but I would still purchase it again.
  • Rear facing up to 50lbs.
  • Easy install
  • Can use with newborn if you buy the xrt model
  • Big and bulky
  • Weighs a ton
By Jenny
from San Marcos, ca
on January 4, 2021
Verified Buyer
This product is true to the description and very sturdy. My 4 year old petite daughter loves this car seat
Great car seat!
By Anonymous
from Washington
on December 25, 2020
Verified Buyer
This is a well made car seat! Very heavy!
Best carseat ever!
By Renee
from Nebraska
on December 14, 2020
Verified Buyer
This car seat is amazing!! We own 4 (2 in each car) and we bought 4 for the grandmas! We€™ve tried tons of car seats and this is our all time favorite. It€™s easy to get in and out, easy to buckle and unbuckle. The straps don€™t get tangled, and it€™s heavy duty so it doesn€™t feel flimsy or wobble around. Highly recommend!!
My 3rd one
By Jeremy
from Texas
on November 22, 2020
Verified Buyer
I love these car seats , the 2020 version even has a cup holder add on
Solid narrow baby and child seat
By Ruth H.
from Senoia Georgia
on November 21, 2020
Verified Buyer
This seat is made with metal so it is very heavy. It is the most solid seat I have ever seen. Also because it is So much narrower than most seats you can fit three across easily in the back seat of my Nissan Pathfinder. It is very easy to take apart and clean completely, easy to adjust and in my opinion the most practical seat I have ever used. I will keep my kids in it and can until they are ready to be in the regular car seats.
  • Narrow, Easy to Clean, Easy to Adjust, you can easily fit three across in the back seat of a crossover vehicle
Best Uses
  • When you do not have to move it from car to car. When it can be placed and stay there.
  • Heavy
Great product as ususal
By OhioNanna
from Ohio
on November 12, 2020
Verified Buyer
This is our 3rd Diono and the first time for the Diono Radian 3R. We are using it with our 3 year old because she didn't need the infant support from the RX one. So far we are just as pleased with it as our other purchases. Thanks to albee baby for great prices and easy shopping as well. You feel like your children or grandchildren in our case will be very safe with these carseats. However, they are not ones you change or move around all the time. They are too heavy for that. We put them in our cars and just don't move them very often. We make sure to have at least one in each car.
Comfortable and Sturdy
from Palm coast, Florida
on November 10, 2020
Verified Buyer
Great carseat. Heavy and sturdy. My son seems to be more comfortable in this seat than in his other as he has more space to spread his legs since the sides do not come up as high. It was also easier to install than our other carseat. I plan to purchase another one for Grandma's car.
Just what I needed
By Grammy
from California
on October 29, 2020
Verified Buyer
With grand child #5 needed car seats for 3 older kids to fit in van. This was just what I needed. They are heavy so needed Son in law to get them set up.
  • Can fit 3 across
  • Too heavy to move between cars
Great Car seat
By Sarah
from Rancho Cucamonga, Ca.
on October 15, 2020
Verified Buyer
This car seat has a great sleek look and very versatile when it comes to growing with your child.
Hard to decide on the stars
By hui C.
from 95678
on August 28, 2020
Verified Buyer
Bought this car seat for my 4yo, he seems to like it very much but not so much for me. I have to reinstall the carseat to remove the cover for wash, or to adjust the harness. It's kind of heavy labor considering the heavy steel frame of the carseat.
  • Sleek design, perfect fit with our old pria85.
  • Storage block for all the parts and accessories
  • Top on safety rating
  • Excellent customer service
  • Difficult to adjust harness and remove cover
great seat, strong, made well and comfortable...
By cindi
from nj
on August 22, 2020
Verified Buyer
i bought this for my great grandson and we love it.... he loves it too... its very comfy for him and built strong.
right out of the box he was climbing in it to check it out... we got it at a great price as it was on sale... very happy with our 3RX ! great seat.... thank you!
Customer Images
Love this car seat
By Brittany
from West Jordan, Utah
on August 19, 2020
Verified Buyer
I wasn€™t sure at first because the pads on the straps are THICK. But after using it for a few months, I€™m definitely a fan.
So glad I got this!
By Luxur S.
from Philadelphia
on August 9, 2020
Verified Buyer
I am so glad I went with this car seat!

It super easy to use, it took maybe 4 minutes? I have two under two and it was simple to install and no fuss when I load up the kids. They enjoy it and it fits great in our small city friendly compact car. Would buy again and have already recommended this brand and STORE to my friends
Customer Images
We didn't use it yet
from Georgia
on July 31, 2020
Verified Buyer
my daughter loves the colors. I had got this car seat for traveling. It's cool that it folds. I brought the straps to go with it but it's still heavy so I'll have to buy the traveling car seat bag with the wheels.
Perfect for smaller cars
from Sarasota, Florida
on July 27, 2020
Verified Buyer
Works like a dream to get 3 across. Would recommend getting the angle adjuster for optimal safe usage

  • Slim - their primary USP
Best Uses
  • Multi kid families
  • Less frills, but does the job
Great car seat
By Gemma M.
from New york
on July 25, 2020
Verified Buyer
Comfy and stylish and fits great in my car highly recommend
Great Carseat- some limitations though
By Kara
from Monterey, Tennessee
on July 16, 2020
Verified Buyer
We liked this. It met the purpose we had- being slimline. However in the forward facing position my children always were found with their heads tipped forward where their airways can't safely be kept open. This was very bothersome for them and for my mom heart! I wish it had a reclining option for forward facing seats. Some vehicles have natural recline in their seats and some don't. I see this being perfect in most cars.

1 Question & 0 Answers
Tanner Marling
from North Vernon, Indiana asked:
June 15, 2020
How wide is this car seat?

Albee Baby Rewards Program
Redeem $5 For<br />Every 500 Points

Redeem $5 For Every 500 Points

Redeem points for cash off orders.
Earn Up To 20 Points For Every $1 Spent

Earn Up to 20% On Purchases

Earn Up To 20 Points for Every $1 Spent.
+50 pts for each approved review.

Earn Points for
Product Reviews

+50 pts for each approved review.
Earn for Referring Your Friends

Earn for Referring
Your Friends

+500 points when friends order.
Login or Register for your Albee Rewards account!