Robert Axle Project Trailer Hitch Adapter | Kid Trailer | Rad Power or Mahle Motor Bikes - M12 x 1.25

A Robert Axle Project hitch adapter that replaces the non-drive-side nut on M12×1.25 rear axles with a threaded stud that accepts a standard trailer hitch. Use it to tow a kid / cargo trailer from a bike that isn't natively set up for one.

The adapter threads on to axles with an M12 x 1.25 thread. The Robert Axle Project Trailer Hitch Adapter for Rad Power Bikes and Mahle/EBIKEMOTION Equipped E-Bikes and most other hub motor equipped Ebikes. Our hitch adapter for towing kid trailers and single-arm bike trailers is high quality and precisely machined. This includes all the two-wheeled child, pet and cargo trailers such as: Thule, Cha

Machined in the USA, stainless-steel construction, backed by RAP's lifetime warranty.

Highlights

M12×1.25 nut replacement — Adds trailer-hitch mount to a non-thru-axle bike
Stainless steel — Built to handle a fully loaded trailer
Easy install — Swap the non-drive-side nut, mount the trailer hitch
Made in USA — Machined in Bend, Oregon
Lifetime warranty — Backed by Robert Axle Project

At a glance

Best for — Towing a Croozer, Thule, Burley or similar trailer from a bike with a M12×1.25 solid axle
Ideal rider — Riders with an older or hub-gear bike wanting to add a trailer

Full specification

Axle diameter — 12 mm
Thread pitch — M12×1.25
Material — 7075 aluminium axle shaft with stainless steel ends
Made in — USA — Bend, Oregon
Warranty — Lifetime — Robert Axle Project
Compatible brands — Aevon, Burley, Chariot, Croozer, InStep, Thule, Weehoo, Wike
Named-fit bikes — Rad Power, Mahle

Pro tip

This adapter is not a thru-axle — it replaces the non-drive-side nut on a solid rear axle. If your bike came with a solid axle and a nut, unscrew that nut, thread on the adapter, tighten it, and your trailer hitch mounts onto the adapter's stud. If your bike has a thru-axle instead, you need a RAP thru-axle, not an adapter.

What's in the box

Robert Axle Project hitch adapter — Stainless steel
Instructions — Replace the non-drive-side nut, mount your trailer hitch

Will it fit

Fits bikes with a M12×1.25 rear axle nut (not a thru-axle). Unscrew your existing non-drive-side nut and check the thread size — this adapter replaces that nut.

If unsure, email fit@hitchabike.co.uk with your bike make, model and year and photos of your rear axle nut.

Quick answer

A Robert Axle Project hitch adapter for bikes with a M12×1.25 rear axle nut. Replaces the non-drive-side nut and gives you a trailer-hitch mount. £51.95.

Fast facts

Thread: M12×1.25
Diameter: 12 mm
Material: 7075 aluminium axle shaft with stainless steel ends
Made in: USA — Bend, Oregon
Warranty: Lifetime (RAP)
SKU: 60226
Named-fit bikes: Rad Power, Mahle

Choose if

Your bike has a solid rear axle with a M12×1.25 nut on the non-drive side, and you want to tow a kid/cargo trailer.
You want a made-in-USA, lifetime-warranty adapter.

Not ideal if

Your bike has a thru-axle, not a solid axle with a nut — you need a RAP thru-axle, not this adapter.
Your rear axle nut is a different thread size — this adapter is thread-specific.

FAQ

How do I know if this axle fits my bike?

Check your bike manufacturer's spec sheet for rear-axle diameter, thread pitch and total length. Or unscrew your existing rear axle and read the markings. Or email fit@hitchabike.co.uk with your bike make, model and year.

Is the trailer hitch included?

No. The hitch is what comes with your trailer (BOB skewer, Croozer Click & Crooz, Thule ball hitch, etc.). This axle just gives that hitch a mounting point on your bike.

What tool do I need to install it?

A 5 mm Allen key — the same one you likely already carry.

Is there a warranty?

Yes — Robert Axle Project offer a lifetime warranty on their axles and adapters.

Where is it made?

Machined and tested in Bend, Oregon, USA.