CYBEX Sirona G iSize - Car seat

Sirona G iSize - Car seat CYBEX - Free user manual and instructions

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Product typeCar seat
BrandCybex
ModelSirona G iSize
CategoryConvertible car seat
StandardR129/03 (i-Size)
Size group61 to 105 cm
Max child weight19 kg
OrientationRear-facing (up to 105 cm) and front-facing (from 15 months and 76 cm)
Fixation systemISOFIX + support leg
RotationYes, 360°
ReclineMultiple positions, flat recline for newborns
HeadrestHeight adjustable
Harness5-point, adjustable
Newborn insertIncluded, up to 60 cm
IndicatorsISOFIX, support leg, seat lock, driving direction
Cover maintenanceMachine wash 30°C, delicate cycle
Manufacturer warranty3 years
Vehicle compatibilityi-Size seats and specific list (see Cybex website)

Frequently Asked Questions - Sirona G iSize CYBEX

How to correctly install the ISOFIX base?
To install the base, extend the ISOFIX arms, push them into the anchors until they click, check that the indicators turn green. Extend the support leg until it contacts the floor, the indicator turns green. Then place the seat on the base until it clicks.
Can I use the seat front-facing from birth?
No, front-facing orientation is only allowed from 15 months and 76 cm. Up to 105 cm, the seat can be used rear-facing for the entire range.
How to rotate the seat?
Pull the rotation handle located on the base. The seat can rotate 360° for easy boarding. Before driving, check that the driving direction indicator is green.
How to adjust the headrest?
Use the adjustment handle at the back of the headrest. Adjust so that the shoulder harness slots are at or slightly below the child's shoulders.
How to clean the seat cover?
The cover consists of 4 pieces. Remove it by detaching the fasteners. Wash at 30°C on delicate cycle, separately. Do not tumble dry or expose to sunlight.
Up to what size can my child use this seat?
The seat is approved for children from 61 to 105 cm, with a maximum weight of 19 kg.
Is the seat compatible with all vehicles?
It is compatible with i-Size seats. For other vehicles, check the compatibility list on the Cybex website.
What to do in case of an accident?
After an accident, the car seat must be replaced, even if no damage is visible. Consult your dealer or the manufacturer.
How to quickly unbuckle the child?
Press the belt adjustment button to release the harness, then press the red button on the buckle to open it.
Can I use the seat without the base?
No, this car seat can only be used with the Base G installed using ISOFIX. The base is mandatory.

User questions about Sirona G iSize CYBEX

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How do I remove the Sirona G iSize seat from the ISOFIX base?
Frequently Asked Questions - 06/05/2026
Response Notice-Facile

To remove the Cybex Sirona G iSize seat from its ISOFIX base, start by pulling the seat release handle (13) upwards to unlock the seat. Then slightly tilt the seat and lift it off the base (7). This first step only separates the seat from its base.

Once the seat is removed, you need to unlock the ISOFIX base by simultaneously and firmly pressing the ISOFIX release buttons (5) on both sides, while pulling them backwards. This double action unlocks the ISOFIX locking arms (6). Then pull the base (7) towards you to extract it from the vehicle's ISOFIX anchor points (8). Make sure to fully slide the ISOFIX locking arms (6) back to the transport position.

Finally, push the load leg (4) back to its original position and fold it completely. This step is important as it prevents the sound alarm from remaining active. A common issue encountered is that the ISOFIX buttons (5) are not pressed down with enough force or are not pressed simultaneously on both sides. Press firmly and at the same time on both buttons, then pull the base forward to completely release it from the anchor points.

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USER MANUAL Sirona G iSize CYBEX

CYBEX Sirona G iSize - 1

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SIRONA G i-Size

UN R129/03, 61 - 105 cm, max. 19 kg (approx. 3 Months - approx. 4 Y)

User guide

Diagram of car seat assembly with numbered parts and close-up insets showing key components like seatbelt, seatbelt switch, and foot.

2 8 i ISOFIX i

3 3 CLICK!

4 CLICK! ISOFIX I X I ✓

5 ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↑ × ✓

6 CLICK!

7

CYBEX Sirona G iSize - SIRONA G i-Size - 8

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CYBEX Sirona G iSize - SIRONA G i-Size - 9

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9 PULLPULL

10 13 12

11 12 13 <15 M <76 cm

CYBEX Sirona G iSize - SIRONA G i-Size - 13

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CYBEX Sirona G iSize - SIRONA G i-Size - 14

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14 CLICK!

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DE ZULASSUNG

Sirona G i-Size

Größe: 61 – 105 cm

Gewicht: bis 19 kg

Thank you for deciding on the Sirona G i-Size when choosing your car seat.

Carefully read this user guide before installing the car seat in your vehicle and always keep it to hand for future reference.

CYBEX Sirona G iSize - DE ZULASSUNG - 1

IMPORTANT INFORMATION AND WARNINGS

CYBEX Sirona G iSize - IMPORTANT INFORMATION AND WARNINGS - 1

The installation of this car seat on the front passenger seat with the front airbag activated is NOT PERMITTED.

Without the approval of the Type Approval Authority, the car seat may not be modified or added to in any way.
In order to keep your child properly protected, it is absolutely essential that you use the car seat as described in this user guide.
Do not use forward facing before the child's age exceeds 15 months and before the child has reached a size of 76 cm.
This car seat may only be installed on vehicle seats which are approved for the use of child restraint systems according to the vehicle manual.
- Do not use any load-bearing contact points other than those described in the user guide and marked on the child restraint.
The newborn inlay is used to protect your child and must be used up until it has reached a height of 60 cm.
The lap belts on the harness must run as low as possible across your child's groin to have optimum effect in the event of an accident.
Before each journey make sure that the five-point harness is correctly adjusted and fits tightly to the child's body. The belts must never be twisted!
Only an optimally adjusted headrest can offer your child maximum protection and comfort while ensuring that the shoulder belts can be fitted appropriately.
This car seat may only be used in conjunction with a Base G installed using ISOFIX.
The car seat must always be correctly installed and secured in the vehicle even when not in use.

The load leg must always make direct contact with the floor of the vehicle. If your vehicle has storage compartments in the footwell, be sure to contact the vehicle manufacturer to ensure the floor of the vehicle can support the load leg.
While driving, the car seat must always be locked in the rearward or forward-facing position.
Always ensure that the car seat is not jammed against any surface when closing the vehicle door or adjusting the back seat.
Luggage or any other objects present in the vehicle must always be firmly secured. Otherwise, they may be thrown within the vehicle, which could cause fatal injuries.
The car seat must never be used without the seat cover. Ensure that only an original CYBEX seat cover is used, as the cover is a key element allowing the seat to function correctly.
Never leave your child unattended in the vehicle.
Parts of this child restraint system can heat up when exposed to direct sunlight and could potentially burn your child's skin. Protect your child and the car seat from direct sun exposure.
An accident may cause damage to the car seat that is not identifiable with the naked eye. Please replace the car seat after an accident. In case of doubt, please consult your dealer or the manufacturer.
Do not use this car seat for more than 8 years. The car seat is exposed to high stress during its product lifespan, which leads to changes in the quality of its materials with increasing age.
The plastic parts can be cleaned with a mild cleaning agent and warm water. Never use harsh cleaning agents or bleaches!
On some vehicle seats made of sensitive materials, the use of car seats may leave marks and/or cause discolouration. To prevent this, you can place a blanket, towel or similar underneath the car seat to protect the vehicle seat.

PRODUCT PARTS

Newborn inlay (1)Seat release handle (13)
Size indicator (2)Headrest (14)
Driving direction control (D.D.C) (3)Headrest adjustment handle (15)
Load leg (4)Seat rotation handle (16)
ISOFIX-Release buttons (5)Driving direction indicator (17)
ISOFIX-Locking arms (6)Position adjustment handle (18)
Base (7)Belt adjustment button (19)
ISOFIX-Anchorage points (8)Shoulder belt (20)
ISOFIX-Indicator (9)Belt buckle (21)
Load leg adjustment button (10)Buckle tongue (22)
Load leg indicator (11)Lap belts (23)
Seat locking indicator (12)Central adjustment belt (24)

THE CORRECT POSITION IN THE VEHICLE

This is an i-Size Enhanced Child Restraint System. It is approved according to UN Regulation No. R129/03 on Base G, for use in i-Size compatible vehicle seating positions as indicated by vehicle manufacturers in their vehicle user manuals. If your vehicle does not have an i-Size seating position, please check the vehicle Type List. You can obtain the most up-to-date version of the Type List from go.cybex-online.com/sirona-g-isize-car-compatibility. It is not guaranteed that all sitting and reclining positions can be used in all approved vehicles.

DIFFERENT USES OF THE SEAT

40 – 105 cm,max. 19 kg76 – 105 cm, > 15 Mmax. 19 kg
CYBEX Sirona G iSize - THE CORRECT POSITION IN THE VEHICLE - 1CYBEX Sirona G iSize - THE CORRECT POSITION IN THE VEHICLE - 2
40 – 60 cm > 60 cmCYBEX Sirona G iSize - THE CORRECT POSITION IN THE VEHICLE - 3CYBEX Sirona G iSize - THE CORRECT POSITION IN THE VEHICLE - 4CYBEX Sirona G iSize - THE CORRECT POSITION IN THE VEHICLE - 5

If you purchased a newborn inlay (1), it should be removed when your child is taller than 60 cm.

The Size indicator (2) shows the size your child must reach before it is at the earliest permitted to convert the seat for forward-facing use.

INSTALLATION IN THE VEHICLE

Always ensure that...

• the backrests in the vehicle are locked in their upright position.
- when installing the car seat on the front passenger seat, adjust the vehicle seat as far back as possible.

The car seat is exclusively made for forward facing car seats, which are equipped with ISOFIX.

Installation of the car seat with Base G

  1. Keep the Driving Direction Control (D.D.C.) button (3) in the middle position and ensure that the base is adjusted for rearward facing car seats.
  2. Fold out the Load leg (4) until it locks into its foremost position.
  3. Release the ISOFIX-Release buttons (5) to extend the ISOFIX-Locking arms (6).

The ISOFIX-Release buttons can both be released independently allowing the ISOFIX-Locking arms to be adjusted independently.

  1. Push the ISOFIX-Locking arms (6) out of the base to their furthest extent.
  2. Place the base (7) on an appropriate seat in the vehicle.
  3. Push the ISOFIX-Locking arms (6) into the ISOFIX-Anchorage points (8) until these lock into place with an audible "CLICK". The two ISOFIX-Indicators (9) will switch from RED to GREEN.
  4. Ensure the base is secure by trying to pull it out of the ISOFIX-Anchorage points (8).
  5. Push the Base (7) towards the backrest of the vehicle seat until it is fully aligned with the backrest.

Moving the base from side to side will also brace it against the vehicle backrest.

  1. Press the Load leg adjustment button (10) and extend the leg until it touches the vehicle floor.
  2. Pull the Load leg (4) out to the next locking position to ensure optimal force transmission.
  3. The Load leg indicator (11) switches to GREEN when the load leg is correctly positioned on the vehicle floor and the acoustic warning signal stops.
  4. Place the car seat on the Base (7).
  5. Please ensure that the car seat locks into place with an audible "CLICK".
  6. Check whether the Seat locking indicator (12) on the base is GREEN.

REMOVAL FROM THE VEHICLE

  1. To unlock the car seat from the base (7) pull the seat release handle (13) up.
  2. Tilt the seat slightly and lift it off the base (7).
  3. Unlock the ISOFIX-Locking arms (6) on both sides by pressing the ISOFIX-Release buttons (5) and at the same time pulling them back.
  4. Pull out the Base (7) from the ISOFIX-Anchorage points (8).
  5. Remove the Base (7) and slide the ISOFIX-Locking arms (6) completely back into their transport positions.
  6. Push the Load leg (4) back into its original position and then fold it in to save space.

ADJUSTING THE HEADREST

The adjustable Headrest (14) can be adjusted by using the Headrest adjustment handle (15) at the back of the Headrest (14). When adjusting the headrest ensure that the Shoulder harness outlets are at shoulder level or slightly below.

ROTATION FUNCTION

Pull the seat rotation handle (16) on the base to turn the car seat.

Before starting your journey, make sure that the seat is properly locked into place and the driving direction indicator (17) shows GREEN.

As soon as your child is older than 15 months and taller than 76 cm, it can also be transported forward facing. For this purpose, set the direction control button to the top position.

The car seat can be used rear-facing for its entire child size range.

To adjust the seat to the recline position, press the Position adjustment handle (18) on the front of the car seat.

We recommend using the flattest recline position for children who are not yet able to sit recline independently.
Always make sure that the car seat audibly clicks into place when adjusting it to either the recline or sitting position.

SECURING THE CHILD

  1. Rotate the car seat to the boarding position.
  2. Press the Belt adjustment button (19) and pull both Shoulder belts (20) at the same time to loosen them.
  3. Undo the Belt buckle (21) by pressing the red button firmly.
  4. The Buckle tongues (22) can now be attached to the indicated places on the cover using the integrated loops.
  5. Put your child in the car seat with their buttocks at the back.
  6. Place the Shoulder belts (20) directly over your child's shoulders.
  7. Place both Buckle tongues (22) together and lock them in place in the Belt buckle (21). You should hear an audible "CLICK".

  8. If you are using a seat with a SensorSafe Clip, push the clip closed until you hear an audible "CLICK" and slide the closed clip down towards the Belt buckle (21).

  9. Tighten the Lap belts (23) and then pull on the Central adjustment belt (24) to tighten the Shoulder belts (20) until they rest snug against your child's body.

The harness should be fitted tight enough so that it is not possible to put a fold in any of the straps.

  1. When using the SensorSafe clip, position the clip directly below the shoulder pads.
  2. Rotate the seat to the preferred travel position. Forward facing direction is only permitted for children exceeding an age of 15 months and a size of 76 cm.

REMOVING AND REATTACHING THE SEAT COVER

The car seat cover consists of 4 parts. These are fastened to the car seat at several places. Once unfastened, the individual parts of the cover can be removed. To reattach the cover, follow the removal instructions in the reverse order.

If purchased with the Newborn inlay (1), the foam must be removed before you wash. There are openings in the fabric for this purpose.

The cover may only be washed at 30^ C with a delicate wash program otherwise it may result in discolouration of the cover fabric. Please wash the cover separately from other laundry and do not dry it in the dryer or in direct sunlight!

MANUFACTURER'S WARRANTY AND DISPOSAL REGULATION

CYBEX GmbH (Riedingerstr. 18, 95448 Bayreuth, Germany) gives you 3 years warranty on this product. The warranty is valid in the country where this product was initially sold by a retailer to a customer. The contents of the warranty and all essential information required for the assertion of the warranty can be found on our homepage: go.cybex-online.com/manufacturer-warranty-car-seats. If a warranty is shown in the article description, your legal rights against us for defects remain unaffected.

Please observe the waste disposal regulations in your country.

CERTIFICAZIONE

Sirona G i-Size

Characteristics of the United States

MAKLUMAT PENTING DAN AMARAN

CYBEX Sirona G iSize - MAKLUMAT PENTING DAN AMARAN - 1

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Product information

Brand : CYBEX

Model : Sirona G iSize

Category : Car seat