We use cookies to allow us and selected partners to improve your experience and our advertising. By continuing to browse you consent to our use of cookies. You can understand more and change your cookies preferences here.

Concord Ultimax i-Size review

Product alert

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 reading

How we test child car seats
Booster seats - are you breaking the law?
£155.00 Typical price

Test score %

Key features
  • i-Size
  • Baby to toddler
Reviewed

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.

Included in our expert review
  • 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?
  • Where can I buy it?
Try Which? for £1
You can cancel at any time

Test results

The overall Which? test score is made up of the following star ratings, all determined by our rigorous lab tests.

Find out how we test child car seats
Try Which? for £1
You can cancel at any time

Put us to the test

Our Test Labs compare features and prices on a range of products. Try Which? to unlock our reviews. You'll instantly be able to compare our test scores, so you can make sure you don't get stuck with a Don't Buy.

Make smarter choices

We have tested 210 child car seats and found that there are 21 Don't Buys and 52 Best Buys.
Range of Child car seat scores
  1. 0%
    Lowest score
  2. 65%
    Average score
  3. 82%
    Highest score
We'll show you where this model sits on the scale so that you can see how it compares to child car seats we've tested
Try Which? for £1
You can cancel at any time

Put us to the test

Our Test Labs compare features and prices on a range of products. Try Which? to unlock our reviews. You'll instantly be able to compare our test scores, so you can make sure you don't get stuck with a Don't Buy.

    CompareRemove all products