12mm Thru Axle for Kid Trailer

(9 customer reviews)

$ 58.00

Robert Axles for Kid Trailers are designed specifically to fit your 12mm thru-axle bike and allow attachment of any hitch-mounted trailer. These fit any trailer that has two wheels and a single point of attachment to the axle. This includes all the two-wheeled child, pet and cargo trailers such as: Thule, Chariot, Burley, Instep, Carry Freedom, and many more.

Purchase our Kid Trailer axle for your bike. Share your stoke for cycling with your kids. Simplify your life by allowing quick and secure attachment of your trailer to your best and favorite bike. Enjoy the adventure.

In stock

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SKU: KID222 Category:


Since 2013, we have been an important part of cyclists’ adventures all over the world. Our axles have millions of miles on them in mountain bikes and road bikes, carbon bikes, fat bikes and e-bikes. Our axles are specifically designed to handle the high-torque loads generated by e-bikes.

Your stock thru-axle is not strong enough to haul your precious cargo! Our axles are 3 to 4 times stronger than the stock axle that came with your bike. Our stainless steel axle ends provide a safe and secure attachment point of the hitch to the axle. The axle is quick to install and remove with a common 5mm hex key.

Our axles are not just designed in the USA, but are made here as well. They are machined by avid cyclists to the tightest standards in the industry. We safety test, to failure, every batch of axles we produce to ensure they exceed your expectations.

Prop65 Warning icon

WARNING: This product can expose you to chemicals including nickel acetate, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.


Robert Axle for Kid Trailers replaces your stock thru-axle so you can attach a child or cargo trailer to your 12 mm thru axle equipped bike.

  • This axle is compatible with Burley, Carry Freedom, Chariot/Thule, Croozer, Instep, and many more hitch style trailers.
  • The true length of the axle shaft is 188 mm. It can be shortened using the included spacers – a flat 6 mm spacer and a tapered 6 mm X-12 spacer. This allows for axle lengths of 176, 182, or 188 mm. Please note: Thru-axle lengths do not equal hub standards. An axle has to be longer than the hub to fit in the frame. A 12Ă—148 hub does not equal a 148mm long axle.
  • This axle has a 1.5 mm thread pitch.
  • The axle shaft and axle end are precision CNC machined.
  • The axle shaft is 7075 aluminum and hard black anodized for rugged durability.
  • The axle end is stainless steel, which allow for mounting of the hitch provided with your trailer. The threads are M10x1.
  • Hardware for attachment of the hitch is included; the hitch is not.
  • No special tools required. Design allows for installation or wheel removal using your standard 5mm hex wrench.
  • Designed, built and quality tested in the USA. Proven around the world.


Need more information about how our axles work?

9 reviews for 12mm Thru Axle for Kid Trailer

  1. Steff

    Passt perfekt in mein Bulls E-Stream Evo 29″

  2. Armin (verified owner)

    Everything is awesome ? Great product with perfect quality and also the order and (international) delivery process worked flawlessly.
    Definitely will suggest this project to others and also will try to shop here again.

  3. Brook Spark (verified owner)

    The product is great! And the people are very helpful and knowledgeable! The new axle itself I believe was lighter then the factory axle I didn’t weigh but it felt lighter.

    I have a 2009 cannondale perp with a proprietary axle length and an internal threaded end screw and could not find a direct match through the online selection process so I called directly and after brain storming and take a few measurements we were able to find an axle that was approximately 18mm longer then the factory axle and that enabled me to use a nut on the threaded end instead of the original screw design and it works flawlessly.

  4. Marco (verified owner)

    worked perfectly on my Jeffsy 2017. Quality is great too.

  5. Charles Williams (verified owner)

    Great product, great service, great company. This is the only axle I could find anywhere that would allow me to fit a kids bike trailer to my new e-MTB. Thanks Robert Axle Project!!

  6. John (verified owner)

    Awesome product, fast delivery. Best place to find the correct axle length. They easily matched up my Superboost + spacing requirements to tow a kid’s trailer.

    Also much easier than trying to source an axle from the trailer manufacturers, which are often reselling what you get here – but for more money!

  7. Ryan (verified owner)

    Works great! Easy install

  8. Hans-Albrecht Meyer (verified owner)

    Informative Website. Good service. Fast Delivery (4 days to Germany).

  9. Marc (verified owner)

    Bravo pour le website. Merci pour la qualité de la pièce et la rapidité de livraison (4 days to France)

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