Britax Boulevard ClickTight vs Diono Radian 3RXT

Both are convertible car seats — here are their published manufacturer specs side by side.

This compares published manufacturer specs — not safety or fit advice. The seat's manual, your vehicle's manual, NHTSA's tools and a certified CPST are the fit-and-safety authority; always check them before installing.

Spec	Britax Boulevard ClickTight	Diono Radian 3RXT
Stage	Convertible	Convertible
Narrow (3-across)	–	✓
Extended rear-facing	–	✓
FAA-approved	✓	✓
Lightweight / travel	–	–

Britax Boulevard ClickTight

5–65 lb

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Diono Radian 3RXT

5–120 lb

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As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Weight ranges are the manufacturer's published limits across all modes.

How they differ

the Diono Radian 3RXT is listed narrow (roughly ≤17″) for fitting three across a back seat; the Britax Boulevard ClickTight isn't listed narrow
the Diono Radian 3RXT lists extended rear-facing (a higher rear-facing weight limit, ~40-50 lb); the Britax Boulevard ClickTight doesn't

Published limits

Mode	Britax Boulevard ClickTight	Diono Radian 3RXT
Rear-facing	5–40 lb	5–50 lb · 18–44 in
Forward-facing harness	22–65 lb	22–65 lb · 30–57 in
Booster (with back)	—	40–120 lb · 40–57 in
Useful life	10 yrs from manufacture	10 yrs from purchase

Britax Boulevard ClickTight: Rear-facing: 5–40 lb and 49″ or less. Forward-facing: 22–65 lb and 49″ or less (printed limits, same height cap both modes).

Diono Radian 3RXT: All-in-one (rear-facing → forward-facing harness → high-back booster; no backless mode found in manual). Forward-facing also requires at least 1 year old + 22 lb minimum (printed manual requirement). No separate age requirement printed for booster mode. Expired over 10 years from date of PURCHASE (manual's own wording — most other brands print "manufacture").

Printed verbatim in the manufacturer's manual (Britax Advocate/Boulevard ClickTight User Guide (Canada, P03810600_A) · Diono Radian 3RXT Car Seat Instruction Manual); “—” = not published for that mode, “not yet sourced” = we haven't read that manual yet, not that the seat has no limit. How we source these →

Recall record

Britax — 22 on NHTSA's record · Diono — 2 on NHTSA's record.

That is the record of the brand — not a verdict on these models. A recall names specific models and manufacture-date ranges, and a seat missing from the record is not "recall-free": check nhtsa.gov/recalls with the model and date of manufacture on your seat's label. Source: NHTSA, retrieved 2026-09-05.

Where to buy

Britax Boulevard ClickTight

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Diono Radian 3RXT

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FAQ

What's the difference between the Britax Boulevard ClickTight and the Diono Radian 3RXT?
The Britax Boulevard ClickTight is FAA-approved for aircraft; the Diono Radian 3RXT is narrow for 3-across, extended rear-facing, FAA-approved for aircraft. Both are convertible car seats.

Which fits three across, the Britax Boulevard ClickTight or the Diono Radian 3RXT?
The Diono Radian 3RXT is listed narrow (~≤17″) for 3-across; the Britax Boulevard ClickTight isn't. Three-across fit still depends on your exact vehicle — confirm before buying.

Which is right for my car and child, the Britax Boulevard ClickTight or the Diono Radian 3RXT?
That depends on your specific vehicle and child — this page compares published manufacturer specs only, not fit or safety. Check the seat manual, your vehicle manual, NHTSA's car-seat finder and ideally a certified CPST before deciding.

Citing these specs? Go ahead — published manufacturer data, last verified 2026-06-11. Copy a ready-made reference:

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