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Home / Family & Kids / Car Seats / Diono Radian 3RXT
8.1 Tested Aug 19, 2026 by Team RankingRight

Diono Radian 3RXT (All-in-one) review 2026

A steel-core seat that folds flat for travel and fits three across, rear-facing to 50 lb and boostering to 120 lb

PriceFrom $299.99 · checked Sep 11, 2026
Install time6 min
Rear-facing to50 lb

Is the Diono Radian 3RXT Worth It?

Best folding all-in-one. The Radian is the seat for families who fly with it or need three across without paying Clek money. Installation rear-facing took patience in our test, which CPSTs will tell you is the Radian's reputation.

Diono Radian 3RXT Pros & Cons

Pros
  • Folds flat and carries like a backpack for flights
  • 17" wide steel-core frame — three across
  • Rear-facing to 50 lb; booster to 120
  • Ten-year expiry
Cons
  • Rear-facing install needed the angle adjuster in two of three cars
  • Low seat sits the child close to the floor
  • Harness adjustment is fiddly

Diono Radian 3RXT at a Glance

8.1 Editor Score
Protection & fitSide-impact structure, energy-absorbing foam, steel frame, harness range, and how well a newborn, a 1-year-old and a 3-year-old fitted; all seats pass FMVSS 213.
29/35
Ease of installationMinutes to a tight, level install in three cars with LATCH and with the belt; NHTSA ease-of-use stars.
15/20
Comfort & longevityPadding, recline positions, height range, years of use before expiry.
15/15
Cleaning & buildMachine-washable cover, no-rethread harness, cup holders, weight.
8/10
ValuePrice divided by usable years, against the field.
14/20
Reader ratingNo reader ratings yet — not part of the score
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Own one? Rate it:

Rubric v1: Protection & fit 35 · Ease of installation 20 · Comfort & longevity 15 · Cleaning & build 10 · Value 20. Score = Σ ÷ 10, locked Sep 11, 2026. How we rank.

Where to buy — prices checked Sep 11, 2026

Amazon — $299.99

Best priceSee Price

Diono — $299.99

Also sold atSee Price

Diono Radian 3RXT specifications

TypeAll-in-one
Rear-facing to50 lb
Forward-facing to65 lb
Booster to120 lb
Expires after10 years
Seat weight28 lb
NHTSA ease-of-use3 /5
RotatingNo
No added flame retardantsNo

Why it scored 8.1

The Radian is the seat for families who fly with it or need three across without paying Clek money. Installation rear-facing took patience in our test, which CPSTs will tell you is the Radian's reputation.

Where it loses

Installation.

Still the right pick for

Travelling families and three-across on a budget.

Diono Radian 3RXT8.1 · $299.99
See Price