Thru Axle for BOB Trailer: 172 to 178mm with 1.5 Thread

(26 customer reviews)

$ 62.00

Yes! A 12 mm thru-axle adapter for BOB Trailers. These Robert Axles for BOB Trailers are specifically engineered to attach the proven BOB Trailer to your thru-axle equipped bike.

Take full advantage of your modern bike with 12 mm thru-axles and harness the rigidity of the thru-axle to haul your BOB Trailer. Set out on any adventure, big or small. Great for off-road tours, trail building, hauling cargo and more!

In stock

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SKU: BOB114 Category:


Since 2013, we have been an important part of cyclists’ adventures all over the world. Our BOB Trailer thru 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.

Our BOB Trailer 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

Additional information

Weight 0.3125 lbs


A thru-axle adapter for BOB Trailers! These Robert Axles for BOB Trailers are specifically engineered to attach your BOB Trailer to your 12 mm thru-axle equipped bike.

  • This axle is compatible with BOB Trailers.
  • The true length of the axle shaft is 178 mm, but can be shortened using the included spacer to 175 mm or 172 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 1.5 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 ends are stainless steel, which allow for mounting of the BOB Trailer bobbins.
  • No special tools required. Design allows for installation or wheel removal using your standard 5mm hex wrench.
  • Please note: This axle does not come with the BOB Trailer bobbins. Those are available separately, here. Or you can reuse your bobbins from the stock BOB Trailer Quick Release that came with your trailer.
  • Designed, built and quality tested in the USA. Proven around the world.


Need more information about how our axles work?

26 reviews for Thru Axle for BOB Trailer: 172 to 178mm with 1.5 Thread

  1. C.B Bonneton (France)

    achat d’une remorque BOB YAK mais axe de 12 mm sur VTT après recherche rien en Europe pour pouvoir fixer la remorque, j’ai fini par trouver (ce fut compliqué) “The Robert Axle Project” au USA, site très bien fait recherche en fonction de la remorque du vélo est on trouve l’axe correspondant envoie et suivi parfait dans un délai de 10 jours, merci a vous car de belle aventure vont ce réaliser.

    Google translate: BOB YAK trailer but 12 mm axle on mtn bike, after search nothing in Europe to be able to fix the trailer, I ended up finding (it was complicated) “The Robert Axle Project” in USA, very well done site. According to the trailer of the bike is found the corresponding axle sends and followed perfect within 10 days, thanks to you as beautiful adventure will achieve this.

  2. Kevin Montague

    Purchased thru axle for BOB Ibex trailer. Perfect fit using template and easy installation video. Have yet to take it out on a ride with the trailer but am sure it will allow me to use my new 29er to pull it instead of having to stay with my old 26. Great job, highly recommend.

  3. Adam Selby (verified owner)

    Great service and fast shipment. The axle took 5 minutes to install and works great for pulling my bob trailer on mountain bike trails.

  4. Dave Lofquist (verified owner)

    Excellent, sturdy product and very responsive customer service!

  5. James Schaefer (verified owner)

    Near instant responses and quick delivery. Kudos!

  6. Andy (Sweden) (verified owner)

    Superb quality and excellent customer support!

  7. Charles Moore (verified owner)

    Works great! Easy install and setup

  8. Eric Wilcox (verified owner)

    Perfect fit with my old BOB gear trailer and my new Ibis Mojo 3! Excellent work, guys!!

  9. Don Olsson (verified owner)

    Purchased the thru axle for the BOB Ibex trailer and the product is a perfect match for my bike. The fitting template and installation video is very helpful as well. Because I was purchasing a second hand trailer which did not include the BOB Trailer quick release, I was lacking the stock trailer pins and RAP Bobbins. Fortunately, The Robert Axle Project sells these as well. Great customer service; quick and knowledgeable response.

  10. Owen Rodabaugh (verified owner)

    Had a work party a few weeks back and used this axle to tow a trailer with two brushers and accessories up and down the Coldwater Lake 230A trail behind my Ibis Mojo HD4. The directions and setup were clear and everything worked as expected.

  11. Tom McGreevy (verified owner)

    Worked perfectly for attaching a rack to my bike which has no mounting points.
    I am very pleased!

  12. Will Ratliffe

    Purchased to enable rack installation on a mountain bike without mounting points. The first axle had a stripped thread; exchange for a replacement was very quick and easy, at which time we realized that either I messed up or the axle sizer did, and we needed a 168 not a 172-178. Again, absolutely no problem to exchange. With the proper one installed the rack fits perfectly. Customer service was as good as it gets.

  13. Brandon (verified owner)

    It fit well and was exactly what I needed to connect the trailer to my bike. Its machined well and is a great product.

  14. Luke (verified owner)

    The axel was perfect, I am now waiting to get my cutthroat back from the shop with a new fork. I am also waiting for a 28 fork for my bob trailer. I am hoping this size axel also fits on my salsa deadwood which also has a 148 boost spacing. Looking forward getting things put together ❤️

  15. M. L. (verified owner)

    I bought this Bob trailer axle so that I could tow my Bob trailer with my new Poseidon Redwood adventure bike. The axle matching process was easy (even for a new bike not yet listed in the automated matching tool. Installation was simple, and the entire setup has worked flawlessly. I love it!

  16. Ace Brown (verified owner)

    Second time I’ve used a Robert Axle and both times find they fit perfect. It’s a beautifully machined and great fitting product.

  17. Jeff Sparman (verified owner)

    Worked perfectly I have a BOB trailer for trail work and wanted to use my 2021 OTSO Waheela C with 700c wheels, to tow various tools to do .trail maintenance. Easy installation, high quality product that is pricy, but but well worth it.

  18. Ianik Guy-Michaud (verified owner)

    Excellent produit, très bonne assistance pour s’assurer de commander le bon produit.

  19. Chris Tauscher (verified owner)

    I own a Salsa Cutthroat 21 and wanted the ability to carry trail working tools and maybe more gear bike packing. They had exactly what I needed to pull a BOB Trailer. Works great!
    They even reminded me to get the bobbins which I was missing.
    Thanks for the help.

  20. Tom (verified owner)

    Fits my Frey Ebike perfectly.
    Great product. Looks fantastically well made.

  21. Sean O

    The last big thing I did before COVID was a 3.5-month bike-mountaineering tour of the high Andes, with a Bob attached to a rigid drop-bar 26er. Three years and one fancy through-axle bike later I’m headed back, and there’s no way I could carry a week or more of food and mountaineering gear with a bike-packing setup. Thanks to Robert Axle, I’ll be that weird old retro guy pulling a trailer again… and getting it done.

  22. Sylvain Bouchard (verified owner)

    The shipped axle was too long for my Panorama Cycle Katahdin gravel bike, but the Robert Axle Projet customer service recognized the mistake right away and sent me the proper axle which fit perfectly to my bike. I now have the same Bob Trailer which fit perfectly three of my bikes (Gravel, Cyclo and City bike)! Awesome!!! The shipping to Quebec, Canada was also very fast 2-3 days! Impressive.

  23. Terry (verified owner)

    I use it on a Salsa Warroad and it works well.

  24. Scooter (verified owner)

    Bought an axle to revive an old Yak trailer, now it is compatible with my thru axle adventure bike, very satisfied

  25. Dadsquatch (verified owner)

    Not much to say, quick and easy to install and it worked.

  26. James (verified owner)

    Yes. Do it. Trail steward discount was given and customer service was exceptional.

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