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SITS Fav SEAT

Cybex Sirona S

Learn more about the Cybex Sirona S convertible rotating seat.

Seat is good for you if
  • 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.
Use caution if you
  • 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.
Stand-out features
  • Anti-Rebound Bar
  • Load Leg
  • Sensorsafe Chest Clip
Buy Now: 
SITS checks manufactures and retailers daily to ensure these are the lowest prices available for these models.
Cybex
Sirona M
Buy Now
Cybex
Sirona S
Buy Now
349.95

Our Review of the 

Cybex Sirona S

Learn more about the Cybex Sirona S convertible rotating seat.

Age

Our recommendation: From 6 months until the seat is outgrown (average 5-6 years old)

Type

A convertible car seat that can be used rear-facing and forward-facing

When

Once the child can sit unassisted

Buy Now: 
SITS checks manufactures and retailers daily to ensure these are the lowest prices available for these models.
Cybex
Sirona M
Buy Now
Cybex
Sirona S
Buy Now
349.95
Michelle sitting in a chair reading a book.

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 

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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.

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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.

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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.

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Use caution if

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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.

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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.

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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

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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.

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airplane

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

This carseat does not have any videos yet.

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.

Buy Now: 
SITS checks manufactures and retailers daily to ensure these are the lowest prices available for these models.
Cybex
Sirona M
Buy Now
Cybex
Sirona S
Buy Now
349.95

Similar Car Seats

Sirona S
Version
Cybex
36
% OFF
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Safe in the Seat textmark in black letters

Notable differences:

Sirona M
Version
Cybex
0
% OFF
hearts-suit
Safe in the Seat textmark in black letters

Notable differences:

Despite the similar name, this is a very different seat. This one does fit newborns well. But it’s quite difficult to install with the seat belt. It does not swivel. It does not have an anti-rebound bar or a load leg.

Specifications

Cybex

Sirona M

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.