12mm Thru Axle for Kid Trailer

(17 customer reviews)

$ 65.00

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

Get 20% Off Lightning Bolt-on Axles With Purchase of Any Trailer or Trainer Axle! Discount Automatically Applied.
SKU: KID215 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 229 mm, but can be shortened using the included 12 mm spacer. This allows for axle lengths of 217 mm or 229mm. 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 12×197 hub does not equal a 197mm 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?

17 reviews for 12mm Thru Axle for Kid Trailer

  1. Joey Talarico (verified owner)

    Excellent product! Exactly what I needed to get my daughter’s trailer attached to my fat bike so that I could pull her on the beach during vacation!!

  2. Seth Brosnan (verified owner)

    High quality product! The fit and finish were perfect. It was the missing piece to Fat Bike adventures with the kids! Thank you!

  3. christian sorgenfrei (verified owner)

    Works perfectly fine for Canyon Dude! Takes 5 min to attach the trailer

  4. Jamie (verified owner)

    Works perfect. Customer support was very helpful in making sure I found the right axle.

  5. Michael Escalante (verified owner)

    Not only is the product exactly what I needed but the quality of the website and follow up from the company is excellent! We are using the trailer often and the through-axle is working great!


  6. Cyrill Gloor (verified owner)

    Used this Product on a Felt DD10 Fatbike. I had to take off 3.5mm from the conical spacer in order to make the axle go all the way into the screw thread on the right hand side as it should.
    It fits perfectly into the frame when no wheel is mounted, but when the rear hub is in, the whole thing gets widened slightly, which required the change on spacer.
    Maybe you could provide the axle with a set of 2 or 3 slightly different spacers to account for such cases.
    Otherwise a great product, no complaints there.

  7. pukki81

    Great axle, I’m using this on my Canyon Dude CF fatbike. Seems better than the axle that came with the bike. Didnt even get stuck in the customs. Thx.

  8. Jens Skalla (verified owner)

    Fits great to my Canyon Dude and works perfect with our Querdoo Kidgoo 2 trailer…?

  9. Niko Kiiskinen (verified owner)

    Fast and quality!

    I ordered an axle for my Canyon Dude fatbike to be able to use our Thule Chariot with the new bike. The axle arrived here, in Finland, after one week from the order. The axle itself feels really sturdy and it was easy to install with the instructions attached.

    I highly recommend!

  10. Justin Davis (verified owner)

    I bought a kid trailer for my Specialized FatBoy and was unable to hook it up with the through axel. Stumbled across this website and thought I would Give them a shot. I got my Axle in the mail a couple weeks ago and it has been Great. Swapped axles just like normal and had the trailer hooked up in 5 minutes. Have Already logged nearly 50 miles with no issues. If hesitant about it – don’t be.

  11. Prasad (verified owner)

    I have a Specialized Carbon Fatboy. I was looking for an axle to hook a kids trailer to take my niece and nephew on the American Tobacco Trail and all the local greenways. I went to local specialized bike shop and they didn’t have an axle for fat bikes ( they buy from burley).

    I found this website and ordered it. Beveled washer nut fit the contours of the carbon frame. Easy installation. I put about 30mi with the trailer so far on gravel, uneven terrain and paved greenways. Great purchase. Thanks Robertaxle project for the solution.

  12. Christian Litard (verified owner)

    Very good ! perfectly fits on my Canyon Dude 2020 for a kid trailer. It took 2 months to reach France due to the Covid19 (not surprisingly !) but now it’s on the bike and gives a real feeling of quality and safety. Thank you !

  13. Mark (verified owner)

    Fantastic axle, quality is far better then my factory one. Bought this for a burley nomad as opposed to the burley made thru axle made overseas. Have another in a different size for another bike. 100% recommend.

  14. joe

    outstanding product and excellent customer service. I doubted that the axle would fit but was assured that it would work. It arrived timely and fit perfectly.

  15. Paul (verified owner)

    Product went in perfectly , finding it on the site was easy peazy

  16. BRANDON (verified owner)

    Perfect part for the job, easy install works Like a charm!!!! Definitely will hit up Robert for hard solutions from now on

  17. Derek Hanson (verified owner)

    Absolutely perfect fitment. I recently bought a 2019 specialized fatboy, I searched the internet with no luck finding an axle that would fit to pull my kids trailer. Stumbled along this website and immediately ordered the trailer axle. It fits perfect. No modifying or anything. The machining is spot on. I have around 20 miles on it pulling my kids and it works great. A+ quality product.

Add a review

Your email address will not be published. Required fields are marked *

You may also like…

  • Robert Axle Project Drive Thru dummy hub

    Drive Thru 1.0 mm Thread Pitch

    $ 35.00
    Add to cart
  • Fat-BOB+12mm-taper

    Thru Axle for BOB Trailer: 217 to 229mm with 1.0 Thread

    $ 69.00
    Add to cart
  • Robert Axle Project Cycling socks by The Athletic

    Robert Axle Project Socks

    $ 20.00
    Select options This product has multiple variants. The options may be chosen on the product page