Radian 3QXT › fit in › Tesla Model Y

Will the Diono Radian 3QXT fit in a 2020–2024 Tesla Model Y?

Yes — the Diono Radian 3QXT fits a 2020–2024 Tesla Model Y.
The Radian 3QXT is about 17" wide; the Model Y's usable rear bench is about 50". It fits one rear position comfortably. Three across is tight (51" needed vs 50").

17"Radian 3QXT width

50"Model Y rear bench

Tightthree across

★★★☆☆NHTSA Ease-of-Use

Check the Radian 3QXT on Amazon → All seats for a Model Y

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What fits this Model Y

One seat, rear position: Yes. The Radian 3QXT installs in an outboard rear position of a 2020–2024 Tesla Model Y with room to spare.
Three across: Tight — three need ~51" against only ~50". A narrower seat is the better bet.
Modes this seat covers: rear-facing → forward-facing → booster.
LATCH: lower anchors up to 40 lb; the Model Y has 2 lower-anchor positions.

ℹ️ Informational only — built from NHTSA public car-seat ratings and published seat/vehicle dimensions. This is not a safety certification and not a substitute for the seat and vehicle manuals. Always confirm the fit and install yourself before every trip. The Radian 3QXT's width (Diono published spec (17 in)) and the Model Y's rear-bench width (Typical for compact suv — approximate, verify install in your vehicle) are both approximate — confirm with a test-fit before buying.

Common questions

Will the Diono Radian 3QXT fit in a 2020–2024 Tesla Model Y?

Yes — the Diono Radian 3QXT (17" wide) fits a single rear seating position in a 2020–2024 Tesla Model Y. Three across is tight — its rear bench is about 50" and three of these would need 51".

Can you fit three Radian 3QXTs across a Model Y?

Probably not — three Radian 3QXTs need about 51" but the Model Y's usable bench is only about 50". Consider a narrower seat — see our narrowest-seats guide.

Sources: seat ratings & modes — NHTSA (pulled 2026-06-18); dimensions — manufacturer specs and owner measurements. Informational only — built from NHTSA public car-seat ratings and published seat/vehicle dimensions. This is not a safety certification and not a substitute for the seat and vehicle manuals. Always confirm the fit and install yourself before every trip.