We are a small company based in Cambridge, England working to improve bicycle safety for children. We want to create a sea-change in bicycle safety, by designing an innovative range of transportation that helps protect your most precious cargo.

Roll-cages, ISOFIX and child seats have been standard in the car industry for many decades, we believe it is time they were available for children on bicycles.

The Conker Box will, we hope, encourage many more parents to use their bicycles on a daily basis safe in the knowledge that their child is well protected on their journey to school and elsewhere.


Before the Conker Box, parents had to choose between protecting their children and protecting the environment, but both of these are essential.

The Conker Box is built to provide peace of mind to parents who want to do the right thing for the environment and their children. It is, we believe, a huge step forward - the start, we hope, of a movement towards greater child safety in the cycling world.


The main body of the Conker Box is an aluminium roll cage.

This ensures that the child is better protected in the event of an accident.

In an accident, the Roll Cage can support the weight of a car on top of it.

It has been rated as supporting up to1500kg. The roll cage has been tested at Cranfield Impact Centre, UK



The Conker Box includes ISOFIX points, which are used within all modern cars to secure children's car seats. This, therefore, allows the Conker Box to connect children's car seats and secure them in place.

The car seat options that are compatible with the Conker Box's ISOFIX points are: 

  • the Cuggle Partridge
    • For children from approximately 6 months to 4 years old
      • Between 9kg to 18kg
      • Groups 1, 2, & 3
    • Retail price of £95
  • Joie Bold
    • For children from approximately 6 months to 6 years old
      • Between 9kg to 25kg
    • Retail price of £199

ISOFIX points will hold the seat securely in place in the event of an accident or impact.

The ISOFIX points have been tested at Cranfield Impact Centre.


The frame is made of welded aluminium, both very strong and light as well as readily recyclable.

The Conker Box is designed to fit the long-wheelbase Bakfiets bike without adaptation, even the original rain cover from the Bakfiets can be transferred directly over

Note: We are not connected with Bakfiets NL and do not represent them. Trademarks and brands are the property of their respective owners.


“Parents are making an ethical decision when they choose to transport their child in a bike trailer, and the least we can do is keep their child safe.”


Conker of Cambridge founder Crispin Sinclair is a keen cyclist and father of two young children, with a background in design and innovation.

His passion for cycling – from taking the children to school every day in the Conker Box (prototype) to spending three months riding solo across Europe - gives him a fantastic insight and the determination to demand a better future for his children.

When Crispin’s bike was crushed in a road accident, it sparked the beginning of the Conker of Cambridge journey, bringing innovations from the world of car safety to the bicycle world.



Bringing unprecedented child safety to the cycling world. 


All aspects of all designs shown on this website are subject to change at any time and without further notice and none form any part of any contract or obligation. All rights, including copyright, in this website, are owned by or licensed to Babel Bike Limited (trading as Conker of Cambridge). Any use of this website or its contents, including copying or storing it or them in whole or part, other than for your own personal, non-commercial use, is prohibited without our permission. You may not modify, distribute or repost anything on this website for any purpose without our prior permission - which we may well grant, but please ask first. Trademarks and brands are the property of their respective owners. We are not connected to or in any way affiliated with Bakfiets NL.