CYBEX Sirona Si Newborn to 105cm Car Seat
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CYBEX · R129/04 · Rotating toddler car seat CYBEX Sirona Si Safety Starts Rear-facing Designed for everyday comfort and long-term rear-facing protection, the Sirona Si combines an integrated base, 360° rotation, an ergonomic reclining seat and convenient access features. Its adjustable fit supports growing children, while Style models add an XXL sun canopy and distinctive premium finishes. 61–105 cmApprox. 3...
Delivery, Shipping & Availability
Isofix Compatibility: Yes
Rotation: 360 Rotation
Seat View: Rear & Forward Facing
Age Group: 0-18kg,3m-4y | Car Seat Age Groups Chart 🔗
CYBEX · R129/04 · Rotating toddler car seat
CYBEX Sirona Si
Safety Starts Rear-facing
Designed for everyday comfort and long-term rear-facing protection, the Sirona Si combines an integrated base, 360° rotation, an ergonomic reclining seat and convenient access features. Its adjustable fit supports growing children, while Style models add an XXL sun canopy and distinctive premium finishes.
61–105 cmApprox. 3 months to 4.5 years
Up to 20 kgMaximum child weight
360° rotationEasy side access
UN R129/04Approved safety standard
From birth (40 cm) only with the separately available newborn insert and inlay, as specified by CYBEX.
Feature 01 · Extended rear-facing protection
Up to 50% Higher Safety Levels¹
Rear-facing travel is required for at least the first 15 months and is recommended for longer. The Sirona Si supports rear-facing travel up to approximately 4.5 years. CYBEX reports up to 50% better protection in frontal-impact internal testing compared with the same seat in a forward-facing position.
Feature 02 · CYBEX GrowTech and ergonomic recline
Designed to Grow with Your Child
An adjustable headrest and extended recline range help the seat adapt as your child grows. CYBEX states that its recline range is 40% greater in both rear- and forward-facing positions. The seat also supports a hip-healthy M-position. A newborn insert and inlay are available separately for use from birth.
Feature 03 · 360° rotation for simpler everyday journeys
Easy Side Entry
One-handed 360° rotation allows the seat to turn towards the vehicle door for easier access. The Easy-In crotch pad stays upright to help make fastening the harness simpler.
Feature 04 · Integrated Linear Side-impact Protection
25% More Side-impact Protection²
The L.S.P. system works with the energy-absorbing shell and headrest to reduce side-impact forces by up to 25%, compared with the same seat without L.S.P. in CYBEX internal testing.
Feature 05 · XXL canopy on Style models
Ideal Sun Protection³
The detachable XXL UPF50+ sun canopy helps shield your child from sunlight and glare. Its breathable mesh window improves airflow. The mesh window itself is not UPF50+ rated.
Feature 06 · Exclusive Style-model finishes
Luxury Design
Style models feature two-tone leather-look detailing and breathable mesh fabric for a refined, comfortable interior.
Feature 07 · Ventilation and moisture regulation
Optimal Breathability
The ventilated shell helps air circulate. On Style models, special 3D mesh fabric offers up to six times the airflow of conventional fabrics, according to CYBEX.
Feature 08 · Support that adapts to growth
From Birth with Optional Inlays
A separately available newborn insert and inlay support babies measuring 40–60 cm. The included Comfort Inlay can provide support until approximately 85 cm. Follow the user guide for when each insert should be removed.
At a glance
Dimensions & installation
Dimensions
Length560 mm
Width450 mm
Height540 mm
Weight · Style12.7 kg
Weight · Comfort12.4 kg
Installation & care
The Sirona Si has an integrated base and uses ISOFIX anchorage points. Confirm vehicle compatibility using the CYBEX car compatibility information and follow the supplied installation guide.
Fabric covers can be machine washed at 30°C on a delicate cycle. Do not machine wash the car seat itself.
Product details
Included & compatible
What's included
- Sirona Si toddler car seat with integrated base
- Comfort Inlay
- Quick-start guide and access to digital user guide
- Sun canopy — Style models only
Newborn insert and newborn inlay are sold separately. A Base S adapter is not included.
Compatible accessories
- Sirona S-Line Newborn Inlay
- Sirona S Line Summer Cover
- SensorSafe Toddler Safety Kit
- Cup Holder
- ISOFIX Guides
- Spare battery for car seats
- Platinum Winter Footmuff Mini
- Snogga Mini 2
Accessories are sold separately. Check compatibility with your specific seat version.
Important safety information: The seat must be installed according to the CYBEX instructions in a compatible vehicle with ISOFIX anchorage points. A rear-facing child seat must never be used in front of an active frontal airbag. CYBEX recommends replacing a car seat after any accident. This seat is not approved for use on an aircraft.
¹ Compared with the same seat in a forward-facing position in frontal-impact internal testing. ² Compared with the same seat without L.S.P. in CYBEX internal testing. ³ The canopy mesh window is not UPF50+ rated. AGR (Aktion Gesunder Rücken e.V.) has awarded the Sirona Si its Seal of Approval for ergonomic design and functionality.
Helpful answers
Frequently asked questions
Will the car seat fit in my vehicle?
It is important to check whether the car seat is compatible with your vehicle before you purchase it. The car seat is approved for use in i-Size compatible vehicle seating positions as indicated by vehicle manufacturers in their vehicle User Guides. If your vehicle does not have an i-Size seating position, please check the Car Compatibility List. To access the Car Compatibility List, follow the relevant weblink in the Quick Start Guide, printed on the packaging box or find it on the product page of the CYBEX website. If vehicle is not listed, please contact CYBEX Customer Service for further assistance.
Can I use this car seat on a flight?
No, this car seat is not approved for use on an airplane.
Is it ok to keep using a car seat after an accident?
CYBEX strongly recommends that you replace a car seat after any kind of accident. This is because tiny hairline cracks, which may not be visible to the naked eye, can appear in the plastic parts of a car seat after an accident. These cracks can pose an increased risk to safety.
My car seat is faulty, how can I get it repaired?
Please refer to the retailer where you bought your CYBEX car seat. They will deal with the matter on your behalf.
Where can I get replacement parts for my product?
You can order replacement parts from a specialist retailer near you. To find a store near you, simply go to the Store Locator on the CYBEX Website.
How do I correctly secure my child in the seat?
Please observe the instructions in the User Guide. Adjust the child car seat to the size of your child and make sure that he or she is properly strapped in to ensure maximum safety.
My child keeps trying to wriggle out of the harness system. What can I do about this?
As with any other restraint system, a car seat can only fully protect your child if he or she is secured correctly and does not actively try to leave the car seat. Please explain to your child the importance of staying in the car seat before you travel. Common issues include the opening of belt buckles or the pulling down of shoulder belts on car seats secured by a harness. Make sure that the belts are fitting nice and snug, you should also consider what clothes your child is wearing while sat in the car seat, as thick clothing reduces the protection offered by the belt. You can keep your child safer by purchasing the SensorSafe chest clip accessory. It helps prevent the child from slipping out of the harness and if your child manages to open the clip, you will be instantly alerted via push notification on your smartphone. Please refer to the User Guide for further instructions and information.
How can I clean my car seat?
Car seats can be cleaned using a vacuum cleaner or damp cloth. Sand or other dirt beneath the cover can also be removed in this way. To clean the plastic parts of the car seat wipe them with a cloth using a mild detergent and warm water. (Warning: Please do not use chemical detergents or bleaching agents under any circumstances.) Please note that a car seat should never be dismantled for cleaning. Please always refer to your car seat’s User Guide when carrying out care and maintenance on your car seat. Generally the seat covers are machine washable at a maximum temperature of 30˚C on a delicate cycle. If you wash them at a higher temperature, the cover fabric might lose its color or shrink. Please wash the cover separately and never dry it by machine or in direct sunlight. (Warning: Only the cover of the car seat can be machine washed. The car seat itself is not machine washable.) Should you wish to clean a car seat more thoroughly than recommended above, you will have to have it cleaned professionally. Please ask the retailer who sold you the car seat to refer you to a professional service.
Can I install a rear-facing seat on the front passenger seat?
Rear-facing car seats must only be installed on the passenger seat if the front airbag has been deactivated. Placing your child on a passenger seat with an activated airbag poses an enormous risk of injury, and CYBEX strictly advises against this. For other types of car seats check the user manuals of both your car seat and your vehicle to find out if you should deactivate the airbag. Statistics show that the safest place for a car seat is on the rear seat behind the front passenger seat. Side airbags do not put your child’s safety at risk. If you have no choice other than to use the front passenger seat, please ensure that the seat is pushed back as far as possible and that the airbag is deactivated.
Can I use the car seat on laterally-facing vehicle seats?
It is not permitted to use the car seat on laterally-facing vehicle seats.
Can I use the car seat on rear-facing vehicle benches (e.g. in vans or minibuses)?
No. This car seat cannot be used on rear-facing vehicle benches.
Can I also use this seat in a car without ISOFIX anchorage points?
No, this seat can only be installed in vehicles with ISOFIX anchorage points, due to the fact that it must be installed with ISOFIX in every position.
Where should I install a car seat in my car?
Although it may be possible to install a CYBEX car seat on other seats in the vehicle, the safest place for a car seat is in the rear seat, behind the front passenger seat. We advise you to refer to the Car Compatibility Tool on the CYBEX Website. You can scan the dedicated QR-Code on your Quick Start Guide or use the specific weblink, provided on the Packaging Box, to access the Car Compatibility Tool for your product.
Can I use the car seat even when the side airbag is activated?
Yes, the side airbag can remain activated when using the car seat.
What kind of clothing should my child wear when seated in the car seat?
Thick clothing prevents the harness/vehicle belt or impact shield from lying tight against the body of the child. Only a correctly adjusted restraint system can offer maximum protection. For this reason, your child should wear everyday clothing. Thick clothing such as winter jackets and clothing with hoods (e.g. hoodies) as well as hats should be avoided where possible. Once your child has been positioned in the car seat, he/she can be covered with an extra blanket for warmth.
What is the maximum diameter of a bottle to still fit in the cup holder?
The diameter of a bottle should not be larger than 7 cm.
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