ITEM# 50615

Diono Radian 3R All-in-One Convertible Car Seat 2019 Grey Dark

This item is discontinued.
Your child’s security is Diono's top priority. The Radian 3R was engineered 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.

Some say three’s a crowd. We say, the more the merrier! The radian® 3R car seats fit 3-across in most mid-size vehicles.

Extended rear-facing

The radian® 3R keeps children comfortably rear-facing from 5-40 pounds for the safest possible position.

Room to grow

Accommodates forward-facing children up to 65 pounds in a 5-point harness and converts to booster mode for kids 50-100 pounds. The aluminum reinforced, adjustable head support and sidewalls provide additional side impact protection.

Worth the Weight

Diono's 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 40 lbs, traveling safely. As they grow to 100 lbs (10 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 r 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 r 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 r has bright soft fabric covers and a memory foam seat bottom. Lined with energy absorbing foam, comfort and safety go hand in hand.
  • 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
Product Reviews
out of 5.0
128 Reviews
Ratings Snapshot
of Reviewers
cHULA VISTA, California
Verified Buyer
Heavy and sturdy.
January 5, 2024
This is a very very sturdy product; however, it's so heavy and harden to clean and install than most other car seats I have owned. Lugging this through the airport was a nightmare.
  • Durable and folds.
  • Super heavy! Harder to clean and install.
Verified Buyer
Not “slim” for rear facing
June 2, 2023
Good, solid, slim car seat. We needed a convertible car seat for my husband’s truck now that our 9 month old has outgrown his infant seat. Since this is marketed as a slim compact seat, it seemed like the best one to go with. While it is slim side to side, it’s definitely not compact front to back. To fit in the truck, rear facing, the passenger front seat had to be pushed all the way to the front and leaned slightly forward. This bothered me so much at first, I considered selling it rather than try to ship it back. After reading some other reviews online, there is a foam cushion you can purchase to angle the car seat upright (for an extra $25). We purchased the cushion and it did help the problem some. Overall, for front facing this is a great narrow car seat. For rear facing, if you have a compact car or truck, I’d look for something else. For $200 you think they could throw in a $25 cushion which probably cost a few bucks to make…
I do like the seat, design, and feel; I’m sure I’ll like it more when we can turn it forward.. I just really hated that I bought it specifically because it was marketed as a “slim” seat, but only if you’re forward facing.
Brewer, Maine
Verified Buyer
Perfect for traveling!
June 2, 2023
Love how easy this is to pack up. Ideal for traveling families!
Verified Buyer
Great seat
May 4, 2023
Great seat. You can fit 3 across on a row. I needed a seat that converts into a booster and this is great.
  • Fits 3 across
  • converts to booster
  • very sturdy
  • Heavy
  • No extra frills
Sarasota, Florida
Verified Buyer
Easy to assemble
April 16, 2023
Very nice . Very heavy . Solid steel. Easy to clean and easy to install .
  • Narrow. Easy to assemble. Not constructive .
  • No head cushion . When child falls asleep head is falling.
Parrottsville, Tennessee
Verified Buyer
Not for us
August 19, 2022
Not a love. My son was very uncomfortable in this seat and overall hated it.
Verified Buyer
Solid, easy to clean, lasts for a long time
April 7, 2022
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.
Grand Rapids, Michigan
Verified Buyer
Worth the Purchase!
March 14, 2022
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.
burton, Michigan
Verified Buyer
Nice car seat
February 22, 2022
My 4 year old and 2 year old love these. The harness is easy and smooth to tighten.
Verified Buyer
Great for tight space
February 4, 2022
Great for tight spaces, a little tricky to install with all diono's rules. Large front to back.
Verified Buyer
Great for tight space
February 4, 2022
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
Verified Buyer
Best 3 across
October 7, 2021
Best seats for 3 across in a back seat. Fits great and is comfy.
Verified Buyer
Easy to install
September 17, 2021
Our daughter loves this seat. Comfortable and easy to install. Only con- we couldn’t figure out how to attach the cup holder.
Shreveport, LA
Verified Buyer
Compact, solid, simple
September 12, 2021
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
North Carolina
Verified Buyer
Very good site and product
August 6, 2021
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.
Portland, Oregon
Verified Buyer
Will be reselling
July 17, 2021
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.
Long Island, NY
Verified Buyer
Great seat, not so easy install.
July 8, 2021
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.

Verified Buyer
Very Wide Front to Back
June 20, 2021
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
Bozeman, Mt
Verified Buyer
Good for short trips around town
June 20, 2021
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.
Rachael W.
Verified Buyer
Love this carseat!
June 15, 2021
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.
Brooklyn, NY
Verified Buyer
Works great
June 11, 2021
Easy to mount and a good size of you have a compact car.
Verified Buyer
Great price
June 9, 2021
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.
New York
Verified Buyer
Comfortable & Narrow
June 2, 2021
The Diono seat is very comfortable for our toddler and also allows 3 to sit across (2 car seats and 1 adult)
  • Narrow
Miami, FL
Verified Buyer
Great quality and easy install
June 2, 2021
Doesn't get better than Diono!
Pasco, WA
Verified Buyer
Great for families with lots of toddlers!
June 1, 2021
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!!
Brownsville, Texas
Verified Buyer
Very Sturdy!
May 22, 2021
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
Montgomery, Al
Verified Buyer
My favorite carseat
May 19, 2021
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.
Chase C.
Verified Buyer
Great product and deal
May 7, 2021
The seat is great. It fits nicely in my truck.
Hemet, CA
Verified Buyer
Amazing deal
April 28, 2021
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.
Arlington, Virginia
Verified Buyer
Slim and versatile
April 22, 2021
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.
THORNTON, Colorado
Verified Buyer
Awesome Package and much cheaper than stores!
April 9, 2021
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.
Kristy H.
Rochester, WA
Verified Buyer
Love 💕
April 2, 2021
Love love love car seats. I wish I would have found these when I first started taking in kiddo 🥰 I love that I don't have but another car seat it grows with. Plus I can put three in my back seat 😁
Verified Buyer
March 26, 2021
Daughter loves the seat. Very slim for easy in/out.
Chippewa Falls, Wi
Verified Buyer
Safe & User Friendly
March 22, 2021
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.
Annissa M.
Verified Buyer
Sleek, safe, stylish.
March 20, 2021
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!
Lindsay R.
Buffalo, New York
Verified Buyer
Great deal for this car seat and bonus pack
March 12, 2021
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.
Audreanna O.
Warrensburg, Missouri
Verified Buyer
Love these for 3 kids!
March 11, 2021
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.
Verified Buyer
Great sturdy car seat!
January 27, 2021
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
Verified Buyer
Overall a good carseat
January 16, 2021
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
San Marcos, ca
Verified Buyer
January 4, 2021
This product is true to the description and very sturdy. My 4 year old petite daughter loves this car seat
Verified Buyer
Great car seat!
December 25, 2020
This is a well made car seat! Very heavy!
Verified Buyer
Best carseat ever!
December 14, 2020
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!!
Verified Buyer
My 3rd one
November 22, 2020
I love these car seats , the 2020 version even has a cup holder add on
Ruth H.
Senoia Georgia
Verified Buyer
Solid narrow baby and child seat
November 21, 2020
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
Verified Buyer
Great product as ususal
November 12, 2020
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.
Palm coast, Florida
Verified Buyer
Comfortable and Sturdy
November 10, 2020
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.
Verified Buyer
Just what I needed
October 29, 2020
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
Rancho Cucamonga, Ca.
Verified Buyer
Great Car seat
October 15, 2020
This car seat has a great sleek look and very versatile when it comes to growing with your child.
hui C.
Verified Buyer
Hard to decide on the stars
August 28, 2020
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
Verified Buyer
great seat, strong, made well and comfortable...
August 22, 2020
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
Customer Q&A
1 Question & 0 Answers
from Seattle, WA asked:
December 21, 2019
What is the weight of the seat?