Diono

Radian 3RX

Diono Radian 3RX

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Overall

#151 in

Travel Car Seats

according to Reddit Icon Reddit

Sentiment score60% positive
3
1
1
Last updated: Jun 26, 2026

Reddit Reviews

Reddit IconDry_Elk_8578
10 months ago

I have the Diono brand

10 months ago

Wife has all graycos in her SUV. I liked the diono better so went with that for my truck. Now she likes those better and also wants them for her car… sure let’s spend another $600 on car seats

10 months ago

Currently have a Silverado 2500 and there’s some room still, but the gladiator cab is obviously a bit smaller

10 months ago

I three Diono R3s. That’s about as slim as they come. Currently have a Silverado 2500 which has plenty of room. But if I downsized it would be between a Gladiator and maybe a Colorado.

Reddit Iconmileyisadog
5 months ago

We have a travel car seat - the diono r3 - and you can buy straps for it that effectively make it into a backpack. We've used it domestically and internationally and it fits on coach seats (front facing) and then you can use it rear facing for the car once you get where you're going. Every time we travel with it, we have parents stopping us and asking about it. Super light weight and easy to use!

Reddit IconReady_Player_
10 months ago

I just went through this for my kids. I looked up gladiator boards and they recommended the Radian 3R. I bought them and I couldn’t get them tight enough for my comfort, so I returned them. I did find the answer though, with the Britax Poplar convertible seats. More expensive, but better rated, and their click tight feature made it really secure. That’s my rec. I currently have them on both ends with an infant car seat in the middle. Works like a charm.

Reddit Iconaccountability_bot
10 months ago

I’ll second this! I had three Diono seats in the back row of a Subaru outback for a few years. It worked rather well!

Reddit IconaRandom_redditor
10 months ago

I have 3 of these across the back of my 2015 Outback. They are a little tight to go in but sit perfectly once in place.

Reddit IconArrev
10 months ago

We had 3 Diono Radian car seats fitting in the backseat of a Subaru crosstrek. What’s tricky is when you need some to be rear facing because they lean back far. For that situation they sell a piece of foam that slides under the seat to safely adjust the angle.

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