Sirona S › fit in › Mazda Mazda3 Sedan

Will the Cybex Sirona S fit in a 2014–2024 Mazda Mazda3 Sedan?

Yes — the Cybex Sirona S fits a 2014–2024 Mazda Mazda3 Sedan, with a caveat.
The Sirona S is about 17" wide; the Mazda3 Sedan's usable rear bench is about 48". It fits one rear position comfortably. Three across is tight (51" needed vs 48"). Note: rear legroom here is limited, so a rear-facing install may crowd the front passenger.

17"Sirona S width

48"Mazda3 Sedan rear bench

Tightthree across

★★★★★NHTSA Ease-of-Use

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What fits this Mazda3 Sedan

One seat, rear position: Yes. The Sirona S installs in an outboard rear position of a 2014–2024 Mazda Mazda3 Sedan, though you may slide the front seat forward for rear-facing.
Three across: Tight — three need ~51" against only ~48". A narrower seat is the better bet.
Modes this seat covers: rear-facing → forward-facing.
LATCH: lower anchors up to 35 lb; the Mazda3 Sedan 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 Sirona S's width (Cybex published spec (~17 in at base; approximate)) and the Mazda3 Sedan's rear-bench width (Typical for compact car — approximate, verify install in your vehicle) are both approximate — confirm with a test-fit before buying.

Common questions

Will the Cybex Sirona S fit in a 2014–2024 Mazda Mazda3 Sedan?

Yes — the Cybex Sirona S (17" wide) fits a single rear seating position in a 2014–2024 Mazda Mazda3 Sedan. Because this vehicle has limited rear legroom, a rear-facing install may require sliding the front seat forward. Three across is tight — its rear bench is about 48" and three of these would need 51".

Can you fit three Sirona Ss across a Mazda3 Sedan?

Probably not — three Sirona Ss need about 51" but the Mazda3 Sedan's usable bench is only about 48". 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.