Radian 3RXT SafePlus

Why We Like It

The Diono Radian 3RXT is the go-to solution for families who need to fit three car seats across a single row. Its 17-inch footprint and reinforced steel frame are unmatched in the category, and the fold-flat design is a genuine travel convenience. Installation takes more effort to master, but once you dial it in the seat is rock solid.

Pros & Cons

Pros

• 17-inch width is the narrowest steel-frame convertible available, ideal for three-across installs
• Aircraft-grade aluminum reinforced frame and 3 layers of side-impact protection
• Folds flat for storage and travel, a rare feature in convertible seats

Cons

• Installation is more involved than competitors — tether and LATCH anchoring requires patience
• Narrower seat width can feel snug for broader-shouldered toddlers

Score Breakdown

Convertible car seats were evaluated on crash-test safety ratings, ease of correct installation, child comfort, longevity across rear- and forward-facing use, and overall value.