Thru Axle for BOB Trailer: 174mm with 1.75 Thread

Thru Axle for BOB Trailer: 174mm with 1.75 Thread

(9 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!

Out of stock

SKU: BOB101 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.


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 axle shaft and axle ends 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?

9 reviews

  1. Peter Brownsdon (verified owner)

    Hi I recently bought a German E bike a Haibike Xduro Allmtn Rc. I have owned a BoB Yak trailer for many years which I have done quite a bit of off road touring with. I only decided to buy the new bike with 142 x 12mm axle when i read about the Robert axle project that fits my BoB bobbins. The axle is very easy to fit but I needed an extra washer to ensure the new axle didn’t protude through the frame as per instructions. The kit only came with one washer but luckily i had a spare in my washer bin.
    I have test ridden the new bike with new axle and of course it works beautifully. as recommended by BoB (The best off road trailer)
    Pedro from Australia

  2. Jarrod (verified owner)

    I purchased this axle to allow for the joining of a BOB Ibex trailer to a 2013 Turner Burner.

    In short, the axle performs as beautifully as its aesthetics. Additionally, I was also very impressed with the promptness of shipping and the various notifications received during shipping.

    If it suits your needs, I highly recommend this axle.

  3. Don (verified owner)

    I left Cape Vincent NY in late April and have ridden the southern shore of the St Lawrence River/Gulf to the tip of the Gaspe and beyond. I’m currently just shy of Cape Britton where I plan to catch the ferry to New Foundland and then on to Labrador.
    The bad news? Several flats so far. Good news? I’ve had occasion to remove the ROBERT AXEL PROJECT rear axle several times now in all sorts of weather and it works flawlessly. It’s easily threaded back into the frame and seats well once tightened down. It’s showing no sign of wear after a fairly grueling 1000 miles plus.
    Can’t recommend it highly enough. Now, to get you folks to design a better tire!
    All the best for future success,

  4. Gerald de Haan (verified owner)

    Stunning – fit on the Trek Super Fly 7 was perfect! One small issue – I have previously used the trailer on a 26 MTB, and now have a 29er. I need to get a new bit from BOB so the trailer fits with the bigger wheel. Thanks RAP!

  5. Susan (verified owner)

    Great service. They evaluated my initial order and helped me correct. Product shipped fast and worked like a champ!!

  6. Dan Gottsch (verified owner)

    I’ve had a BoB for quite a while, used it a bunch on my 26er, then upgraded to a 29er Ibex, used it for a few years on a Salsa with standard skewer. Then got a Niner ROS and the BoB hasn’t been on a trail since. I needed to haul a chainsaw in and do some trail work a few weeks ago, and found the Robert Axle solution. I bought the axle and bobbins as I didn’t want to rob the bobbins off my skewered axle as I still use it on my 26er around town.

    Shipping was prompt, got the bobbins and axle in a couple of days. I had to bend the yoke on the Ibex out just a tad to get it to fit the wider axle. I have two yokes, one for my 26er and one for my 29er, so now I just swap yokes depending on which bike I’m using to pull the BoB.

    Glad to have my BoB option on the trails again. Was able to get in and clear 30+ trees in one go the first day out, drug the bike/trailer over a few big ones and the axle held up great.

  7. Randy Fay (verified owner)

    Worked great for me. Great personal service, simple installation.

  8. P’An-Tau Jiricek-Scott (verified owner)

    It does what it says it does – got my Bob Yak trailer towing in line with both my CX (700c) and MTB (29er) and my back is weightless!

  9. Thom MacDonald (verified owner)

    I recently purchased the complete kit along with the bobbins and pins – Not only are these precision parts of the highest quality, their customer service is just as excellent!

    The Robert Axle Project is the true solution for bikes, Mountain or Road, that have thru-axles!

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All orders from our website are via US Postal Service, from Oregon, U.S.A. We make every effort to ship your order within one business day.

Shipping rates and average delivery times are:

• United States: $7.50 USD, 3-4 business days

• Canada: $21.50 USD, 10-14 business days

• All other International: $21.50 USD, 12-16 business days

We are unable to offer expedited shipping. If you need expedited shipping of our products, please visit our Dealers & Distributors page for options. We cannot take responsibility for any delays during shipping, including delays in customs or incorrect shipping information.

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  • These BOB trailer bobbins are made by the Robert Axle Project to make our axles compatible with the BOB Trailer.

    Keep in mind it is always a good idea, on any significant tour, to carry a spare Bobbin and Trailer Pin, just in case.


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  • The BOB Gear pin with rubber lanyard secures the BOB Trailer to the axle. All BOB Trailers come with a set, but it is handy to have an extra in case you lose one. Sold individually.



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  • This inner tube for your BOB Trailer has a Presta valve, just like the valves on your bike. This means you are not sitting on the side of the trail fumbling to convert your pump to a Schrader valve. Changing flats suck. Make it easier on yourself with this tube.

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