Canada’s only rotating convertible car seat combining a load leg, L.S.P., and SensorSafe in a single unit.
The Cybex Sirona S is a 360° rotating convertible car seat used rear-facing from 4 lbs and forward-facing from 22 lbs, with a maximum of 65 lbs. The Canadian version combines an integrated load leg, L.S.P., and SensorSafe in a single unit.
All specs on this page reflect Canadian CMVSS 213 listings, not US specifications.
Rotate toward the door, buckle your child, then rotate back to the travel position. The EasyLock bar installs the vehicle belt once for both modes.
The one-time belt installation sets the Sirona S apart. Switching modes requires only rotating the seat and adjusting the recline. Dual-level indicators confirm the correct angle.
The load leg on the Cybex Sirona S extends from the base to the vehicle floor and limits forward seat rotation during a frontal impact collision. It is not an optional accessory or an add-on. The load leg is integrated directly into the base and is always active when the base is correctly installed and the leg is in contact with the vehicle floor.
In certified testing, the load leg reduces crash forces transmitted to the child by up to 30% in a frontal impact compared to a seat installed without it. The integrated anti-rebound bar works alongside the load leg to limit rearward seat movement during a crash, addressing both the forward and rearward phases of a collision in a single installation.
Because the load leg contacts the vehicle floor rather than the back of a forward vehicle seat, it functions correctly in most standard seating configurations. Parents who plan to move the seat between vehicles should confirm load leg floor contact in each vehicle, as floor clearance can vary. The Installation section of this guide covers this in detail.
The Cybex Sirona S is built around multiple independent safety systems that work together throughout the life of the seat. Understanding what each system does helps parents evaluate whether the Sirona S is the right level of protection for their family.
Linear Side Impact Protection (L.S.P.) is integrated into the headrest shell rather than added externally. L.S.P. reduces side collision forces acting on the child by up to 25% compared to the same seat without this technology. As the child grows and the headrest is adjusted, the L.S.P. protection moves with them through all 12 headrest positions.
The 12-position height-adjustable headrest features a no-rethread harness — headrest height and harness height adjust simultaneously without removing or re-routing the straps. This is a meaningful daily usability feature that eliminates a common frustration as children age through the seat. The removable newborn insert provides additional head and body support for smaller infants and is removed as the child grows into the seat.
The steel-reinforced frame provides structural durability across the full use life of the seat, from birth through approximately four years. The Cybex Sirona S meets CMVSS 213, the federal motor vehicle safety standard governing child restraints for legal sale in Canada, and carries the National Safety Mark required on all car seats sold in this country.
SensorSafe is a Bluetooth-enabled chest clip built directly into the Cybex Sirona S SensorSafe variant sold in Canada. It connects to a parent's smartphone via the free SensorSafe app and an in-vehicle OBD II receiver. The OBD II receiver is compatible with most vehicles from the 2008 model year or newer. Some electric vehicles may require an additional adapter; contact Cybex directly for compatibility confirmation before purchase.
The SensorSafe system monitors four conditions and sends alerts to the parent’s phone: the child has unbuckled themselves while the vehicle is in motion; the rear seat temperature has become too warm or too cold; the child has been seated for an extended period without a break; and the driver has exited the vehicle without removing the child from the seat. The SensorSafe version of the Cybex Sirona S is the variant sold through Kido Bébé and other authorized Canadian retailers.
The Canadian version of the Cybex Sirona S is certified to CMVSS 213 and carries the National Safety Mark required for legal sale in Canada. The specifications below reflect the Canadian retail version sold through authorized retailers including Kido Bébé.
The Sirona S is used rear-facing from 4 lbs to 50 lbs and forward-facing from 22 lbs to 65 lbs, with a maximum height of 49 inches. It features 360° rotation, an integrated load leg, Linear Side Impact Protection (L.S.P.), SensorSafe, a one-time vehicle belt installation that covers both modes, a steel-reinforced frame, and full CMVSS 213 certification with the National Safety Mark.
Canadian weight limits for the Cybex Sirona S are confirmed at rear-facing 4 to 50 lbs and forward-facing 22 to 65 lbs. Parents who encountered US-specification content elsewhere may have seen different figures. The Canadian specification is the only one relevant for use in a vehicle registered and operated in Canada under CMVSS 213.
For families currently using the Cybex Cloud G Lux infant seat, the Sirona S is the natural next seat in the Cybex ecosystem. The transition point is when your child approaches 35 lbs, which is the rear-facing maximum for the Cloud G Lux.
The Cybex Sirona S rewards careful first-time setup with a seat that stays correctly installed without daily effort. Understanding each step before you begin makes the process straightforward. For parents who prefer hands-on guidance, the Kido Bébé boutique in Saint-Laurent offers in-person installation walkthroughs with our team.
Belt installation uses the EasyLock bar. Route the vehicle seat belt through the dedicated belt path on the base, then engage the EasyLock bar over the belt. The bar significantly reduces the effort required to achieve a tight belt installation compared to conventional belt routing. Once the belt is correctly tensioned and the EasyLock bar is engaged, this is a one-time setup for that vehicle. The seat stays in place for every subsequent trip without reinstallation.
Load leg setup requires extending the adjustable foot until it contacts the vehicle floor firmly with no gap. The load leg must make solid floor contact to deliver its crash-force-reduction benefit. If you move the seat between vehicles, confirm floor contact in the new vehicle before every trip. In vehicles with a pronounced floor hump in the rear seating area, floor clearance for the load leg may be reduced. If you are unsure about compatibility with your specific vehicle, contact Cybex or a certified child passenger safety technician before purchase. This is an honest limitation worth knowing in advance: the Sirona S is not universally compatible with every vehicle configuration.
Dual-level recline indicators are built into the base. Two separate indicators are present, one calibrated for the rear-facing position and one for forward-facing. When switching your child from rear-facing to forward-facing, check both indicators to confirm the base is at the correct angle for the new position. An incorrect recline angle affects both comfort and safety performance.
Montreal-area parents can book an in-person installation walkthrough at Kido Bébé's Saint-Laurent boutique. Our team can confirm correct setup for your specific vehicle before you leave the store. Visit us at 4100 Boulevard Thimens, Saint-Laurent, QC, or call 1-866-430-0003 to arrange a visit.
Yes. The Cybex Sirona S is sold through authorized Canadian retailers including Kido Bébé in Montreal. The Canadian version meets CMVSS 213 and carries the National Safety Mark required on all car seats legally sold in Canada. You can purchase the Cybex Sirona S directly through Kido Bébé's Cybex collection, with in-store support available at our Saint-Laurent boutique.
Available now at Kido Bébé, Montreal’s authorized Cybex retailer. In-store installation support at our Saint-Laurent boutique, 4100 Boulevard Thimens.
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