Thru Axle for bicycle- trailer

In cooperation with The Robert Axle Project we offer the Thru Axle for bicycle- trailer! The solution for bikers who have a bike with thru axle and who want to use one of our trailers!

With this 12mm Thru Axle, you can attach any of our Radical Design bicycle trailers (or a trailer of any other brand) to any bike with a rear 12mm thru axle.

The Thru Axles are designed for maximum strength and ease of use in attaching your trailer. The Thru Axle for bicycle has a stainless steel 10x1mm threaded stud to attach our hitch. Replace your stock axle with this Thru Axle for bicycle trailer, connect your hitch, then connect your bicyle trailer, and off you go!

Please note: the size printed on your thru-axle is not enough

Many customers refer to the measurements printed on their current thru-axle when choosing an adapter. Unfortunately, this is not sufficient to determine the correct type. There are other critical specifications to consider, such as:

• Exact length and thread pitch

• Cone shape or interface

• Type of axle fitting

Even if the printed size seems right, differences in details can cause the adapter to not fit or function properly.

Use the Axle Finder

To avoid mistakes, we strongly recommend using our Axle Finder. This step-by-step tool will guide you to the correct adapter for your bike.

👉 Open the Axle Finder (choose: I am attaching a... KID-TRAILER)

Prefer to measure yourself?

Download our clear A4 guide with instructions and key tips for manual measurement.

👉 Download the A4 guide

Still unsure? Just get in touch — we're happy to help!

• KID221 - Thru Axle Adaptor 167mm with 1.75mm thread
• KID211 - Thru Axle Adaptor 174-180mm with 1.75mm thread
• KID212 - Thru Axle Adaptor 159-165mm with 1.5mm thread
• KID213 - Thru Axle Adaptor 160-172mm with 1.0mm thread
• KID214 - Thru Axle Adaptor 172-178mm with 1.5mm thread
• KID217 - Thru Axle Adaptor 154-167mm with 1.0mm thread
• KID226 - Thru Axle Adaptor 171-183mm with 1.0mm thread
• KID210 - Thru Axle Adaptor 192-198mm with 1.75mm thread