Radian 3QX › fit in › Mazda Mazda6
Will the Diono Radian 3QX fit in a 2014–2021 Mazda Mazda6?
Yes — the Diono Radian 3QX fits a 2014–2021 Mazda Mazda6.
The Radian 3QX is about 17" wide; the Mazda6's usable rear bench is about 50". It fits one rear position comfortably. Three across is tight (51" needed vs 50").
The Radian 3QX is about 17" wide; the Mazda6's usable rear bench is about 50". It fits one rear position comfortably. Three across is tight (51" needed vs 50").
17"Radian 3QX width
50"Mazda6 rear bench
Tightthree across
★★★☆☆NHTSA Ease-of-Use
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What fits this Mazda6
- One seat, rear position: Yes. The Radian 3QX installs in an outboard rear position of a 2014–2021 Mazda Mazda6 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 Mazda6 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 3QX's width (Diono published spec (steel-framed, 17 in)) and the Mazda6's rear-bench width (Typical for midsize car — approximate, verify install in your vehicle) are both approximate — confirm with a test-fit before buying.
Common questions
Will the Diono Radian 3QX fit in a 2014–2021 Mazda Mazda6?
Yes — the Diono Radian 3QX (17" wide) fits a single rear seating position in a 2014–2021 Mazda Mazda6. Three across is tight — its rear bench is about 50" and three of these would need 51".
Can you fit three Radian 3QXs across a Mazda6?
Probably not — three Radian 3QXs need about 51" but the Mazda6'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.