ROBERT AXLE PROJECT · US-machined thru-axle adapters
A Robert Axle Project hitch adapter for bikes with a M12×1.25 rear axle nut.
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.
