Cybex Sirona SX2 I-Size Car Seat


Simple to set up. A dream to use. The 360° rotating Sirona SX2 i-Size takes the stress out of installing the car seat and getting your child secure. Reliable safety features combine with ease of use for a carefree travel experience.

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Full description


Simple to set up. A dream to use. The 360° rotating Sirona SX2 i-Size takes the stress out of installing the car seat and getting your child secure. Reliable safety features combine with ease of use for a carefree travel experience.

Product Details


  • Quick and easy to get your child onboard
  • Comfortable travel in the safest position
  • Preset side-protection for error-free installation

Automatically safe and easy travel

It only takes a moment to get your child onboard and to swivel the seat to a rear-facing position, safe and secure from the start of your trip. If you wish to switch your child to forward-facing when they grow bigger, 360˚ rotation lets you do it in seconds. And the advanced Linear Side-impact Protection System is pre-set for immediate use – one less thing to take care of so you can focus on enjoying the journey ahead.

Quick and easy to get your child onboard
The 360° rotation mechanism takes the back strain out of getting your child onboard. It’s a breeze to swivel the seat to the door side and get your child in and out. Switching between rear and forward-facing travel also couldn’t be easier.

Comfortable travel in the safest position
A rear-facing car seat improves your child’s safety in the event of a head-on crash. In this position front impact forces are distributed across the car seat shell. It is mandatory for children to travel rear-facing until they are over 15 months old and 76 cm tall. However, CYBEX recommends that children travel rear-facing in the Sirona for as long as possible.

Pre-set side-protection for error-free installation
Advanced Linear Side-impact Protection is ready to use from the start, with no extra installation required. In combination with the energy-absorbing shell, it can reduce the force of a side impact by approximately 25%.

Reduces impact forces in the forward-facing position
Energy Reduction Technology improves safety performance during front-facing travel. Impact forces are transmitted directly into the car seat via the harness system, where they are partially dissipated by energy-absorbing materials. This reduces the forces acting on the child’s sensitive neck by approximately 20%.

Quick change to a sleeping position
The one-hand recline function makes a peaceful drive only a moment away. Quickly adjust the seat and your child can take a relaxing nap on the go. With different settings available in both riding directions, it’s easy to find the perfect sleeping position.

Grows with your child up to 4 years old
The height-adjustable headrest has 12 settings for a customized fit. As your child grows it’s simple to adapt the seat to keep pace.

Easier to get your child in and out of the seat
The belt holders are a genius feature that give you a helping hand with getting your child on board. Hook the harness straps out of the way – the simple solution to tangled-up limbs!

Straightforward installation and anchorage in your vehicle
ISOFIX is a reliable way to install the car seat in your vehicle. Set-up is simple with fast one-click attachment and a load leg to anchor the seat in the vehicle. Easy-to-check indicators confirm when the seat is installed and ready to go.

Diverts impact forces away from your child
The energy-absorbing shell is designed to flex with an impact and channel dangerous forces away from your baby.

Tech Specs:

  • i-Size Norm, UN R129/03
  • Height: 61 – 105 cm (from 45 cm with newborn inlay) Sold Separately
  • Weight: max. 18 kg
  • Age: from approx. 3 months up to 4 years (from birth with newborn inlay)


  • 360˚ rotation mechanism
  • Rear-facing car seat
  • Advanced Linear Side-impact Protection
  • Energy Reduction Technology
  • One-hand recline function
  • Height-adjustable headrest
  • Belt holder
  • Energy-absorbing shell

Care Instructions:

  • Fabric covers machine washable at 30°


  • Compatible with Newborn inlay, Summer cover, Cup holder, ISOFIX guides, Sensorsafe 4-in-1 Kit

Length 710 mm
Width 490 mm
Height 680 mm
Weight 14.1 kg


Age Guide

Car seat group
0+, 1,
Age guide
Birth to 4 years
Child weight guide
From birth to 18kg

Car Fitting

Isofix base compatibility
Cybex base Z
Seat belt compatible
Attachment between car seat and isofix


Travel system compatible
Car seat facing position
Forward and rearward
Lie flat
Car seat adjustable height
Headrest adjustment
Newborn insert included

Safety information

Add Sensorsafe
Without Sensorsafe
Safety features
Side impact protection
European safety standard
i-Size (R129)


Manufacturer's warranty
2 years
On sale

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