12mm Thru Axle for Kid Trailer

(17 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: KID210 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 198 mm, but can be shorted using the included 6 mm spacer. This allows for axle lengths of 192 mm or 198 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 12×142 hub does not equal a 142 mm long axle.
  • This axle has a 1.75 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 (metric).
  • 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?

17 reviews for 12mm Thru Axle for Kid Trailer

  1. Jeremy (verified owner)

    This axle opened up awesome opportunities for our family. I am using it with a Trek Fuel full suspension and a Burley Tail Wagon for our two little pups. My young kids get a kick out of being able to take the dogs when we ride. Ordering online was a breeze thanks to the figment guide, the axle arrived sooner than expected, and I am impressed with the quality. Installing was simple and it hasn’t budged over the first forty miles of use. Great company with great products that solve problems and open doors for those with a two wheeled lifestyle!

  2. Jonathan (verified owner)

    This is my second thru axle (one for my fat bike and one for my fuel ex) from Robert axle project and both have been incredible. They are very strong and pull a double burley with two 40 lb children without a problem. I often forget to remove it and ride enduro trails with my burley adapter still attached. Easy to install and remove.

  3. Kathy Hatcher (verified owner)

    The product went on my bike without a problem and I was able to hook-up my trailer right away! This product is awesome.
    And the team behind the product is very good as well.

  4. Christopher Slade (verified owner)

    Absolutely no complaints about this. Got sick and tired of trying to “make it work” on my 2015 Trek Remedy when riding around and wanting to tow the little guy in the trailer. The Remedy is not designed for trailer towing, but this axle works beautifully with the Trek APB swingarm setup and no longer do I need to worry about damaging the pivot mechanism, or just fighting to mount a trailer.

    Highly recommend this product for anyone looking to EASILY make their high performance racing/enduro rig be able to slow down with the family!

  5. Murray (verified owner)

    As advertised! The Axle Finder worked great for my Trek Remedy. Our Devinci Troy is not currently in the Axle Finder but there is a good explanation for how to interpret the numbers stamped on the axle. After ordering they arrived in good time and the quality is high. We are looking forward to our bike-packing trip.

  6. Jeffery (verified owner)

    Thank you!

    Just installed the new axle on my Co-Op 1.2 and it fits perfectly! After three trips to REI and two orders for the “right part” that did not work, you guys took care of me and figured out the solution to my Burley Flatbed Cargo Woes!

    Looking forward to my next adventure!

    Jeffrey 🙂

  7. Jeffrey Thompson (verified owner)

    Great customer service. Awesome product. I was unable to find the proper part anywhere else. Even the bike and Hurley were baffled at my requests!

    Thanks Robert Axle Project!!!


  8. Ben W (verified owner)

    Better than any burley adapter you will find. Great construction and works perfectly!!

  9. Chris Wang (verified owner)

    I couldn’t find any adapters that would work with my new Co Op bike and the trailer I have, I contacted Robert Axle directly and was able to point me in the direction of this axle. Ordered the axle and spacers, and now I’m back on the road enjoying bike rides with the family! I couldn’t be happier!

  10. larry delgado (verified owner)

    just received my axle, installed it in under 5 minutes, extremely satisfied with the quality, tech support, and especially the shipping speed. we went on our first family ride with our new daughter and she went straight to sleep. thank you guys for building a great product and getting this little family outdoors.

  11. Julien (verified owner)

    Very simple search on the website, order made on Tuesday, and delivery in France on Friday. Top!! and perfect Axle!!

  12. Jeff Wenzbauer (verified owner)

    Great quality axle. Love how easy it was to find an axle for my setup using the wizard on this site. Works perfect to mount my kid trailer to my bike.

  13. Kenny Sidwell

    Installed the 12×192 on my Salsa Deadwood to pull my dog trailer. The original Salsa axle says it’s 12×188, so I went up a size and used the spacer that came with the Robert Axle. Fits like a charm and actually seems to be more substantial than OE. Package came within a few days of ordering. Thanks for coming up with this solution for disc braked bikes. I would definitely order from Robert Axle again.

  14. R. Graham

    It worked perfectly.

  15. Kyle

    The Robert Axle Project is the real deal!! They were able to match me with the axle that I needed, even though it took a couple tries. I was unable to find the correct axle on my own, so I ordered what I thought was the best fit, turns out I was wrong 🙁 Once I took my axle out and took pictures, RAP was able to get the correct one sent out, and even included return postage for the wrong one. Phenomenal customer service, excellent product. Already taken my daughter out on multiple rides, we love it!

  16. Andrew (verified owner)

    Robert Axle Project was recommended by the bike shop where I bought our Burley trailer. I ordered the axle based on the shops instruction for the exact axle specs. It came direct from Bend 2 days later. Installed super easy, does the job perfectly! Easy to swap out for my old thru axle on my FS Devinci for riding sans trailer! Highly recommend!!!

  17. Brian (verified owner)

    Fit exactly as advertised and the buying process/walkthrough makes it very foolproof

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