Cybex Sirona S
Learn more about the Cybex Sirona S convertible rotating seat.
- You want a swivel car seat.
- You want a seat with extra safety features.
- You have a child who is below the 50th percentile for height.
- You need to fit 3 people in one row of the vehicle.
- You have a child that is above the 50th percentile for height.
- You want to use a convertible seat from birth.
- Anti-Rebound Bar
- Load Leg
- Sensorsafe Chest Clip
Our Review of the
Cybex Sirona S
Learn more about the Cybex Sirona S convertible rotating seat.
Our recommendation: From 6 months until the seat is outgrown (average 5-6 years old)
A convertible car seat that can be used rear-facing and forward-facing
Once the child can sit unassisted
Stand Out Features of this Car Seat
Anti-Rebound Bar
The anti-rebound bar is an added safety feature for rear-facing that can reduce the secondary movement of the car seat, called rebound, during a crash. When a collision occurs, the car seat will move forward, towards the front of the vehicle, and rotate downward. And as we all know from high school physics, every action has an equal and opposite reaction — so after that initial movement, the car seat will rebound, or “bounce back” towards the backrest of the vehicle seat.
The ARB minimizes this bounce-back effect, helping limit the movement of the car seat and your child inside it! ARBs may also limit the side-to-side rotation of the car seat in a side-impact collision. Overall, it’s a great feature on a rear-facing car seat!
Load Leg
A load leg is a pole that comes down from a car seat and rests on the vehicle’s floor. Load legs reduce crash forces which offer additional protection, especially for your child’s head, neck, and spine. This is currently the only convertible car seat on the US and Canadian markets that has a load leg. You can use it in both the rear and forward-facing positions.
Sensorsafe Chest Clip
This seat comes with the SensorSafe chest clip. This unique chest clip communicates with an app on the caregiver’s phone to provide four types of information: if the child is too hot or too cold; if the child has been buckled in for too long; if the chest clip is unbuckled; or if the child is still buckled in the car after the vehicle has been turned off. These alerts can bring major peace of mind!
Seat is good for you if
You want a swivel car seat.
This seat swivels easily in the rear-facing mode. It is possible to swivel the seat in forward-facing mode, but it’s not as straightforward as it is when rear-facing. If you have the top tether attached, (and we recommend that you do), you will have to loosen it to swivel the seat to the side and then tighten it back when you swivel it back into position. Cybex has said that if you are using the load leg, you can choose to not use the top tether. But without knowing how the seat performs forward-facing with a load leg instead of a top tether, we aren’t sure how that compares as far as crash dynamics.
You want a seat with extra safety features.
This seat comes with some extras! It is currently one of the only convertible car seats on the US and Canadian markets that has a load leg. In addition to that, it also has an anti-rebound bar and side impact pods.
You have a child who is below the 50th percentile for height.
This seat works best for children who are shorter in stature. The highest harness height is slightly lower than many of the other convertible car seats. It also has a shorter headrest that will be outgrown rear-facing earlier for taller children since this seat does require the child to have at least 1″ of car seat shell above their heads. We see many kids outgrow this seat around 2 rear-facing due to the short headrest.
Use caution if
You need to fit 3 people in one row of the vehicle.
With one of the side impact protection pods (LSP) extended, this seat is 21″ wide. It’s not going to fit well in most 3 across configurations. If you did manage to fit it, you definitely would not be able to utilize the swivel function. If you need to fit 3 across, you can find some better options here.
You have a child that is above the 50th percentile for height.
This seat has a slightly lower harness height than most of the other convertible car seats on the market. In addition, the headrest is on the shorter side, so taller children tend to outgrow this seat rear-facing by the 1″ rule before they get anywhere near the height or weight limit. For these reasons, this seat is best for children who are below the 50th percentile for height.
You want to use a convertible seat from birth.
We have found that this seat does not fit newborns well as they tend to slump in this seat. The slumping causes the newborns to have a chin to chest position which can cause breathing problems. There are some convertible seats that can fit from birth. You can check out our reviews for Cosco Scenera Next or Clek Foonf. But in the Convertible Buying Kit, we also note which car seats fit newborns well.
Quirks to be aware of
Challenging Installation in Some Vehicles
Despite the tension panel that is supposed to make installation easier, we have found that it’s not always possible to get a tight seat belt installation with this seat and it tends to vary by vehicle. If you are having trouble installing it, you can try a video chat with Cybex before returning it. It is possible to install with the lower anchors instead of the seat belt; but that method has a 30 lbs limit for rear-facing and a 35 lbs limit for forward-facing, so that wouldn’t be a long-lasting option.
Child Fit Information
Installation Information
Airplane Use
The US version of the Cybex Sirona S is not an FAA-approved car seat. The Canadian version can be used in an aircraft, however, we would not recommend it. It is very heavy and likely too bulky to fit in most airplane seats. Here are some of the seats that we do recommend for airplane travel. For help with all things airplane travel and car seats, check out our Wheels Up Course and private Facebook group.
Videos
SITS Bottom Line
The Cybex Sirona S car seat presents a compelling choice for parents and caregivers seeking safety and convenience. Its swivel function, particularly in rear-facing mode, makes it a standout feature for ease of use. However, it’s essential to note that this seat is best suited for children below the 50th percentile for height. The impressive safety features, including the anti-rebound bar and load leg, provide additional peace of mind in the event of a crash.
In summary, the Cybex Sirona S offers innovative safety features and convenience, but it’s essential to consider your specific needs and circumstances when choosing a car seat.
Similar Car Seats
Notable differences:
Specifications
Cybex
Product Information
Weight: 31lbs
Width: 21"
Highest Harness Height: 16.5"
Rear Facing Limits
Height: 17-49"
Weight: 5-40lbs
Head Height Rules: at least 1″ below the top of the headrest
Lower Anchor Connectors Weight Limit: 40lbs
Forward-Facing Limits
Height: 28-49"
Weight: 22-65lbs
Head Height Rules: ears must be below the top of the headrest
Lower Anchor Connectors Weight Limit: 40lbs
No Back Booster Limits
Highest Belt Guide Settings
High Back Booster Limits
Other Important Details
Newborn Fit
good
Expiration Limit
8 years
Crash Replacement Policy
replace after any crash
Harness
no-rethread
Lock-off
no
Vehicle Seat Protector
This brand does not permit a vehicle seat protector.