12mm Thru Axle for Kid Trailer

(40 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: KID217 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 Hitch-Mount Trailers replaces your stock axle to attach your child trailer to your 12mm thru-axle equipped bike.

  • This axle is compatible with Burley, Carry Freedom, Chariot/Thule, Croozer, Instep, and many more.
  • The true length of the axle shaft is 167mm, but can be shorted using the included spacers – a flat spacer and a tapered X-12 spacer. This allows for axle lengths of 152 mm or 167 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 142mm long axle.
  • This axle has a 1.0 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?

40 reviews for 12mm Thru Axle for Kid Trailer

  1. Kristen (verified owner)

    This is the perfect solution to be able to pull my dog in her Burley Trailer on advertures with my Specialized Diverge. Quality product from some great people. Thanks!

  2. Sebastien (verified owner)

    Works perfectly for my new Specialized Diverge to pull my kids Chariot. Great service from knowledgeable people. Thanks!

  3. Mikko (verified owner)

    Now I can peacefully wait for coming winter, because the trailer were earlier attached only to my race bike, which is not ideal bike on winter time 😉

    My bike: Radon ZR Race 8.0 27,5″, model 2016.

    I will definetly tell about my experience to all my friends and local bike dealers!

  4. Michael (verified owner)

    Works like a charm! I was a bit skeptical at first given the name of the site but then I really needed a solution for my bike. The price is a bit high and I missed a discount but the folks at Robert Axle Project was great enough to credit me back the discount.

    The product worked as advertised and I am back in towing my girls around once again! Thank you so much for having this product!

  5. Gur Talmor (verified owner)

    Perfect product. Works like a charm, fits my bike and trailer great.

  6. Casey Thomas (verified owner)

    Great solution for thru axle bikes. I purchased a Specialized Sequoia and needed to pull Thule Chariot trailer. I tried Thule’s axle first, but the thread pitch didn’t match. The Robert Axle Project fit perfectly, accepts the Chariot hitch receiver easily and is a much better option than frame mounted devices.

  7. Thomas (verified owner)

    Fits perfect for my Specialized Turbo S, the car stays now in the garage when bringing the kids to the kindergarden.
    Shipping was also quite fast.
    Best Regards from Germany

  8. Jason (verified owner)

    Thank you!!!!!!when i upgraded to a new bike i didn’t consider if my $400 Burley tail wagon would work. i went from a quick release skewer to thru axles. and of course it didn’t. Thank goodness for this product it saved me a ton of money and aggravation. And my puppy thanks you too….

  9. Jeff (verified owner)

    Good quality, works well, perfect fit for my bike.

  10. Chris (verified owner)

    A pleasure to be the 10th reviewer! Prompt delivery of my thru axle to keep my new specialised diverge towing our 1yr old in the Thule chariot. Feels quality and solid and had there been any problems Im very confident TRA would have assisted. Arrived in Australia very quick too. Easy to fit and set up. Just make sure it threads right through the frame at the other side so it’s flush. Thank you for sharing your passion and minimising disruption to our favourite hobby!

  11. Ray (verified owner)

    Works great on my Specialized Diverge with an Aosom Elite II trailer

  12. Andrew (verified owner)

    This worked great to attach my Hamax Outback trailer to my Santa Cruz Tallboy 1. My daughter loves it!

  13. Andrew (verified owner)

    Easy to use. Great product and customer service. I’d highly recommend it.

  14. Charley Coffey (verified owner)

    Excellent solution for kid trailer + thru axle gravel bike. The instructions for measurement & part selection are accurate and thorough, and I received prompt and clear answer to an inquiry that I made before placing my order. The system design is elegant, and installation was very straightforward using the online video as guidance. I will likely be ordering an identical item for my spouse’s next bike.
    Thank you, Robert Axle Project!

  15. peter (verified owner)

    exactly what i hoped for: perfect fit and function. now towing a toddler in a burley trailer from my santa cruz 5010.

  16. Olof (verified owner)

    Perfect on my Specialized Sequoia with a Thule Chariot Lite!

  17. SIlvan (verified owner)

    brilliant! Nobody could help me – except for The Robert Axle Project! Surprisingly simple and fast product finder! Thanks!

  18. Árni Þór Eiríksson (verified owner)

    Exactly as Id imagine…12mm axle made of quality materials, perfect fit for my Santa Cruz Chameleon 27.5+ bike. Detailed enough instructions and fitting the trailer Was easy. Will definatly recomend.

    The product finder is very easy to use and seems to be accurate

  19. Jussi (verified owner)

    Excellent quality and perfect fit on my Santa Cruz Chameleon with a Burley Honey Bee trailer. Super fast delivery to Finland!

  20. Turbotime4 (verified owner)

    Top notch quality product and very easy to install – I did find it hard to torque the outer nut to spec given that you have to hold the axle while tightening but the ol german gutentight has seemed to do the trick. My daughter loves being pulled in her trailer and I like that I can now use my Santa Cruz Chameleon on and off the trail!

  21. Tyler Porteous (verified owner)

    Works perfectly. Super simple install, and very sturdy design. Works great on my Santa Cruz Hightower LT.

  22. Gabriel (verified owner)

    Light weight, easy to setup, and works like a charm. I love that you set it up once and then swap between the standard axle and this one in seconds without requiring further adjustment. Brilliant and effective.

    2020 Santa Cruz Hightower w/ Burley Delite 2 child trailer

  23. Adam (verified owner)

    Worked for my Specialized Sequoia to pull my Burley Cargo Trailer. Great product and thankful that someone does this work!

  24. Fred Marquez (verified owner)

    Perfect solution to use in my Canyon Grail with a Thule kids trailer.
    I am really happy with the quality and customer service from Robert Axle.
    Thanks for suppling such a great solution to bike owners.

  25. One more Michael (verified owner)

    Insanely fast delivery (40 hrs from Oregon to Germany, quicker than most local vendors), perfect fit, amazing quality and the most dedicated service you can possibly think of – RAP rocks!

  26. Jasmin (verified owner)

    This axel worked great so I can now pull my twins in our chariot on my mountain bike. Easy instructions, great website. Thanks!

  27. Ben (verified owner)

    Spot on fitment per the “Axle Finder.”
    Picked up a “KID217” for my 2021 Canyon Grail CF SL 8. Works perfectly!

  28. Dennis Dawes (verified owner)

    Excellent service! Just what I ordered and needed. Quality product.
    Thank you!!!

  29. Dave (verified owner)

    Top quality item! Perfect 😍 thanks for making it easy

  30. Erik De Leon (verified owner)

    First of all, the service that I received from this company was excellent, top-of-the-heap. I was about to cancel my order since I didn’t think the item would arrive on time (shipping to Montreal). They upgraded my shipping at no charge so my item can arrive early (it was early by about 3 days before my trip). So that to me already makes this company worth the cost, in my opinion.

    As for the axle itself: it was quality, fit my 2021 Specialized Diverge Carbon perfectly. The mechanic at my LBS (was in the shop for something unrelated) commented how the axle looked and felt like a quality product, so that is comforting.

    Thank you again!

  31. Siv (verified owner)

    With the birth of our 2nd baby I needed to find a way to still get my rides in while being a somewhat productive parent. The answer was to pull my 3 year old around town in the kid trailer, but that was easier said than done since switching to a bike with thru axles. There is a lot of confusing info online as well as suspect axles, but Robert Axle Project made it easy to find the right axle I needed to make it all work! And there’s no need to remove the axle when not using the trailer, simply remove the hex nut and the trailer hitch and leave the axle in.
    Bike: 2020 Canyon Endurace
    Trailer: Burlery d’lite

  32. Jeff Ebert

    The website was easy to use and it found the thru axle I need for my 2021 Santa Cruz mountain bike. The thru axle came quickly and fit perfectly. I wish I found Robert axle project sooner. I was researching parts to accommodate my 148 boost rear. I called Thule, Shimmano, and to many bike shops to list with zero success. Once I entered my bike information the part I need was suggested and we have been off riding. Thanks.

  33. Todd Temporale (verified owner)

    Fit my canyon grail perfectly. Super fast shipping – first class company !

  34. Jan Rey P. (verified owner)

    Fit my 2022 Canyon Grizl AL 7 and Thule Chariot Cross trailer perfectly. Fast shipping, and clear technical documents to help determine the appropriate axle to buy.

  35. Visa Salokoski (verified owner)

    Great product, works perfectly in Canyon Grail 6 AL with Thule Chariot Cross 1 trailer. This website made easy to buy the right axle from a massive amount of different axles available online. Happy to recommend this!

  36. Jeff Adams (verified owner)

    Works perfectly on a Canyon Endurace. The process to get it and the help along the way were top notch. I highly recommend These axels.

  37. Filippo (verified owner)

    Works great on a Santa Cruz Heckler CC 2021 and a Thule Courier!
    Thanks guys!

  38. Steffen Rusch (verified owner)

    fits and perfect on my grizle.

  39. Valtteri Luoma (verified owner)

    Got this for Canyon Grizl CF. Works perfectly with Thule Chariot.
    Shipping was fast.
    Found this from Canyon’s Reddit conversation.

  40. Branden (verified owner)

    Plugged my bike brand (Canyon Grizl) into the form and trusted this was the correct axle, and it was! Works great and easy to assemble if you know how to change a wheel 🙂

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