CYBEX Sirona M2 i-Size (Isofix)

Test year: 2016

General information:

  • Birth – approx. 4 years | birth – 105 cm (birth – 41.3″)
  • rearward facing: birth – 105 cm
  • forward facing possibility: 76 cm – 105 cm (29.9″– 41.3″)
  • i-Size approved

ADAC overall rating: Good


  • Isofix with support leg

Cheapest place to buy:

In several colors + base:

ADAC result in details:


Good safety

  • front and side impact crash with low risk
  • belting is optimal
  • stable position in the car

Good operation

  • incorrect usage is not probable
  • easy and fast installation
  • operating instructions and warnings are easy to follow

Good ergonomics

  • good upholstery
  • convenient seating position
  • child has good space

satisfying processing

  • washing machine possible
  • easily removable cover

very goodpollutants

  • Pollution is very low



  • bit more complex buckling


  • leg rest is not optimal
  • more space is required in the car
  • child has impaired view to the outside


  • minor problems in processing


Cybex Sirona M2 is i-Size approved, meaning that up to the baby must be in a rearward facing seat up to 15 months, but the baby can travel in Sirona M2 in a rearward facing position up to 105 cm – approximately 4 years and it significantly lowers the risk of injury in an impact. Fixing the seat with seat belt is not possible. Its clever design makes it comfortable for taller kids who need more leg room, and at the same time it fits in smaller cars as well.

Sirona M2 has been designed and engineered in Germany.


  • The seat can be used in a forward facing position from 16 months – but not necessary.
  • A central adjuster helps to adapt the size and height of the harness and headrest to the baby and they can be adjusted simultaneously. 12 different height positions are available.
  • The Telescopic Linear Side-impact Protection (L.S.P. System) protects the baby from a possible side impact by absorbing and channeling away the energy with its flexible material. You have to open the Linear Side-impact Protection on the side that is closer to the door. In case, you place the seat in the middle of the rear seats, you must not unfold the Linear Side-impact Protection.
  • It has a 5-point harness system.
  • The seat is part of the M line modular products: Sirona M2 can be used with Base M isofix, that is the same base you can use with CYBEX Aton M i-Size seat.
  • The shell is energy absorbing for side impact protection.
  • Only place the seat into the isofix base with one click, an indicator also shows to prevent any possible misuse.
  • A belt holder keeps the harness out of the way while placing in and out the baby.
  • 5 rearward and 3 forward facing recline positions can be chosen and easily adjusted with one hand.


Additionally, you can buy a summer cover, isofix guides and a cup holder matching with the Sirona M2 seat.

When the car seat is installed on the front passenger seat, you must switch off the front passenger airbag.

I hope you liked this review and if you have any question about the Cybex Sirona M2 or want to leave your own personal experience, leave a comment below.


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