Sirona S › fit in › Toyota Sienna
Will the Cybex Sirona S fit in a 2021–2024 Toyota Sienna?
Yes — the Cybex Sirona S fits a 2021–2024 Toyota Sienna.
The Sirona S is about 17" wide; the Sienna's usable rear bench is about 54". It fits one rear position comfortably. Three even fit across the back (51" needed vs 54").
The Sirona S is about 17" wide; the Sienna's usable rear bench is about 54". It fits one rear position comfortably. Three even fit across the back (51" needed vs 54").
17"Sirona S width
54"Sienna rear bench
Yesthree across
★★★★★NHTSA Ease-of-Use
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What fits this Sienna
- One seat, rear position: Yes. The Sirona S installs in an outboard rear position of a 2021–2024 Toyota Sienna with room to spare.
- Three across: Yes — three need ~51" against a ~54" bench. Test-fit; three-across is decided by half-inches.
- Modes this seat covers: rear-facing → forward-facing.
- LATCH: lower anchors up to 35 lb; the Sienna has 3 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 Sienna's rear-bench width (Typical for minivan — 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 2021–2024 Toyota Sienna?
Yes — the Cybex Sirona S (17" wide) fits a single rear seating position in a 2021–2024 Toyota Sienna. Three of them also fit across its roughly 54" rear bench.
Can you fit three Sirona Ss across a Sienna?
Yes — three Sirona Ss need about 51" and the Sienna's usable bench is about 54". It's close, so test-fit before buying.
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.