Concord Ultimax i-Size review
This child car seat and Isofix base has passed the regulatory tests required by ECE R129 to be sold as suitable for children from 40cm to 105cm. However, our crash tests found weaknesses in frontal-impact safety. The car seat shell broke during frontal impact crash tests when used forward-facing and the injury risk to a child is high. In side-impact crash tests, the crash test dummy’s head was not protected well enough and hit the side of the car.
Further readingUse our tools, tips and advice to protect you and your home How we test child car seats
Test score %
- Baby to toddler
- Extended rear-facing
The Concord Ultimax i-Size car seat joins a long list of baby-to-toddler car seats that can be used rearward-facing from birth right up to 105cm, which is around four years old. It's approved to the latest i-Size R129 car seat rules, has a handy recline feature, side-impact protection and soft padding, but it's not cheap. We've made it a Don't Buy baby car seat in our review because the seat shell broke when we crash-tested it forward-facing. Read our safety alert for more information.
- Pros and cons
- What is it?
- How safe is it?
- Is it easy to fit?
- Is the seat comfortable?
- Is there anything I should watch out for?
- Is there anything else I should know?
- Should I buy it?
- StageBaby to toddler
- Direction of travelRearward-facing/forward-facing
- Manufacturer URLwww.concord.de
Make smarter choices
- 0%Lowest score
- 65%Average score
- 82%Highest score
Best baby car seats
Key safety differences between baby car seats and child car seats. Why babies need more protection in car crashes and how to keep them as safe as possible. Plus car seat carrycots vs baby car seats.
How to buy the right child car seat
Get our expert advice on which car seat you need for a newborn, baby or child. We explain car seat weight groups and i-Size, and give top tips on how to buy the best child car seat when you head to the shops.
Car seat weight groups
Which? guide to car seat weight groups. From group 0+ 0-13kg (birth to around 12-15 months to Group 1/2/3 9-36kg (around 9 months to 12 years), find out why car seat weight groups matter and when to go up a car seat group