12mm Thru Axle for Trainer: 165 to 159mm with 1.5 Thread

(34 customer reviews)

$ 54.00

Our Trainer Axle is designed to adapt your thru axle equipped bike with your on wheel trainer, such as a 1up, Blackburn, Cyclops, Kinetic, Tacx, Wahoo and many other trainers. Our goal is to fit the thru axle to your bike perfectly, so we minimize spacers and extra parts, providing a clean, high performance axle for your bike. Train, warm up and be race ready and fit for the season.

SKU: TRA212 Category:


  • This Trainer Axle is designed to adapt your high quality bike to your wheel-on trainer. These are compatible with all the popular brands: Blackburn, Bkool, Cyclops, Elite, Kinetic, Tacx, Wahoo and more.
  • Our first priority is building a precision thru-axle. Our axles fit into your bike as well or better than the stock thru axle.
  • The axle is installed with a simple 5 mm hex/allen key. The same tool that you carry on every ride.
  • The best part? When it’s time for your race or time to head outside, simply remove your bike from the trainer, remove the drive side axle end and go. Our axle is suitable for use on or off the trainer. Indoors or out.
  • Important: Before you order, make sure your specific trainer will accommodate the width of your modern thru-axle equipped bike. Measure your trainer at the widest setting and measure the outside width of your bike frame. Our the trainer axle ends will extend 15 mm past your frame on each side. Our axles are not designed for direct-drive trainers.

Additional information

Weight 0.3125 lbs


Robert Axle for Trainers replaces your stock 12 mm thru axle so you can use your bike on a trainer.

  • This axle is compatible with 1up, Blackburn, Cyclops, Kinetic, Tacx, Wahoo and many other on-wheel resistance trainers.
  • The true length of the axle shaft is 165 mm, but can be shortened to 159 mm using the included 6 mm spacer.  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 ends are precision CNC machined from 7075 aluminum, and hard anodized for rugged durability.
  • No special tools required. Design allows for installation or wheel removal using your standard 5 mm hex wrench.
  • Designed, built and quality tested in the USA. Proven around the world.


Need more information about how our axles work?

34 reviews

  1. Mike Spalding (verified owner)

    I needed a trainer axle for my Giant Defy Advanced Pro 1 road bike. Giant plans to offer a trainer axle, but my LBS couldn’t say when it would be available. The Robert Axle website made it easy to determine which of their axles would fit. They shipped it promptly, it’s a beautiful piece of craftsmanship, the included installation instructions were clear and simple, it fit perfectly, and I’ve been riding my trainer while the snow piles up outside. Truly a quality product from quality people – highly recommended!

  2. Richard Blankenship (verified owner)

    I needed a trainer axle for my daughter’s Giant/Liv Avail Advanced 2 but couldn’t find one until I found The Robert Axle Project. Their customer service and support was excellent in making sure that I ordered and received the correct axle. The product is excellent, so much so that I ordered an axle for my Domane 4.5 Disc bike to replace the one that I purchased from a different source earlier. The axles are perfect fits. Great group with whom to do business. I have no reservations recommending the company or product.

  3. Phil Jensen

    I moved to a new bike (TCX-SL2) which has 12mm thru axle rear. Tried several other places to find the right axle to allow me to use my CycleOps trainer with no luck. These folks sent exactly the right part, it’s well made and it came quickly. I would recommend them without reservation. Thanks!!!

  4. Bryan (verified owner)

    Bike: Merida Scultura Disc
    Trainer: Wahoo KICKR Snap
    Sizing: CHECK using the chart they have; if in doubt email them, they are very helpful and prompt in replying

    I love riding both indoors and outdoors, and this axle allows me to do just that without the headaches of switching axles etc. There is nothing worse than having to unscrew the axle, replace it, keep the bike from wobbling, align the hub/frame,…. all to make a 4 minute commute to the shops to get that one zucchini my wife needs, and then reverse to process to get back on the trainer. Now, I just the leave the axle in and forget about it.

    From a pure-training point of view, when the weather does a get a bit chillier, it means that I can warm up on my trainer at home and all I have to do is take the bike out of the KICKR Snap and I start my outdoor training nice and warm.

    Wahoo sells a similar product for mounting a bike on the trainer but it is a rip off, not nearly as functional and they do not encourage it to be used outside.

  5. Rodrigo Biffi (verified owner)

    I checked sizes with the comparison table and after that I was very confident on which axle to order. The axle attached beautifully to a Giant Defy Advanced 2 (2017) running on a Tacx Bushido Smart trainer. As a matter of fact the axle contact with the trainer arms is way more precise now as compared with my previous experiences with quick release axles (less jiggling). Fast delivery. No trouble. Recommend 100%.

  6. Gabe Williams

    Hello, I own an outdoor store in northern Michigan which includes a bike and ski shop. I recently ordered a Giant Avail Advanced Pro for my wife and upon bringing it home to put on the trainer, quickly realized it had a rear through axle. After looking through our shop catalogs including QBP and J and B importers, I came to the conclusion I had to look online. I came across these guys and after sending an email and getting a quick response I ordered and received my axle in two days from California… Incredible. Though we are a Brick and Mortar shop, we ship skis all over the country and our customers love our personal service and that’s what I love about the Robertaxleproject!

  7. RyanS (verified owner)

    I’m using this axle with my 2017 Giant Defy. Works great in my trainer. Best of all, it was reasonably priced AND actually available when nothing else was.

    I haven’t used it on the road since I like my wheel to be removalble without tools when I’m out but it’s good to know that it would t be the end of the world if I forgot!

  8. Matthew Brennan

    Purchased this for my Scott Solace Disc 10, works perfectly with my Nashbar Fluid Pro trainer. Easy to install on the bike, easy to install the bike on the trainer.

  9. Oris Fortuna (verified owner)

    I recently purchased an in door bicycle trainer to use it on my Scott Solace bike; just to find out that the universal axle that came with the trainer did not fit. Then I went to the local bicycle shop to purchase the right piece. That shop didn’t carry the piece, however they did the research for me and they recommended me The Robert Axle Project (TRAP). I went ahead and provided the right information to TRAP. In a matter of days, I had the part. Everything is working perfect. I am pleased with the product and the quality of the service. Highly recommended!

  10. Jason Rowland (verified owner)

    This model has proven to work with my Giant TCR Disc combined with my Wahoo trainer. Ordering a second axle for my wife’s Avail.

  11. Steven Nelson (verified owner)

    I purchased this axle for my wife’s Liv Avail and Cycleops trainer. The fit was perfect.

  12. Curtis Smith (verified owner)

    Perfect!!! Giant still doesn’t have trainer axles for their Defy Advanced bikes, so I had to turn to Robert Axle. Fast shipping and the axle works perfectly!!

  13. Brett Perchaluk (verified owner)

    Works great with my Giant TCX Advanced SX and Tacx trainer! Feels nice and solid in the trainer, and shipped fast to Canada. The bike shop said it might be weeks before I could get a trainer axle from Giant so I sourced this one.

  14. Joe B. (verified owner)

    I needed this for my Giant Defy Advanced, and it worked perfectly! Glad to have a product that I can use for a long time on my trainer.

  15. Johnny Balding (verified owner)

    Worked perfectly! High quality product that was easy to install. I had a question on the use of the axle & it was answered within an hour. Great service & would highly recommend this company!

  16. AJ (verified owner)

    Perfect for the trainer. Great stuff here. Highly recommend.

  17. Howie Granat (verified owner)

    Axle worked perfectly for my new Look 765 Disc on an older Minoura trainer. Used the measurement guide, and with the confirmation from the Robert Axle team – the axle arrived 3 days later and worked splendidly. Fits really well on trainer and the bike feels stable and secure.

  18. Michael Gogolen (verified owner)

    Ordered for a Pinarello Gan, fit perfectly with my bike and my CycleOps Jet Fluid 2 trainer. Much different size than what was imprinted on the factory axle, so definitely check out the sizing worksheet. I didn’t think there were axles available sized for my bike, but fortunately that was wrong.

  19. Dan Shadix (verified owner)

    I bought the manufacturers (CycleOps) trainer axle for my Scott Addict Gravel 30 and it just didn’t work. It came with a bunch of spacers to supposedly make it fit but it was too long even with the new trainer adapter I bought with it. I was ready to give up on it when I found The Robert Axle Project and decided to give it one more try. The axle fits perfectly with no changes to the trainer and is simply a superior design.

  20. Mia E. (verified owner)

    Purchased a Cyclops trainer and the rep there suggested this site to purchase the necessary axle to fit the trainer for my Liv Avail Advanced bike. The website was easy to use and helpful in choosing the correct size for my bike. Would recommend.

  21. Michael Hand (verified owner)

    Wonderful product. I bought this for my 2018 Giant Defy Advanced 2 to fit my indoor fluid trainer and the product performs better than I expected. The ordering process was easy and straightforward, and the shipping was quick. If I ever need another axle adapter The Robert Axle Project will be the first place I look.

  22. Doug Dye

    Much better design than some of the others on the market. Easy installation and beautifully made.

  23. Dale Krueger (verified owner)

    I needed an axle for my Orbea Terra so that I could use it with my indoor trainer. My local bike shop said that I would need to buy a new trainer because no one made an axle that would work. I was surprised when I found that Robert Axle made one that exactly fit my bike. Easy to install and I did not need to buy a new trainer. It is a great product specifically designed for my bike and trainer. I highly recommend Robert Axle Project

  24. Ramiro (verified owner)

    I needed a trainer axle for my Giant Defy Advanced Pro 1 road bike and found this one. Very well build and fits perfectly on my Elite Quo Digital trainer!!

    Thank you

  25. Robert Chen (verified owner)

    New bike with thru-axles but old trainer. What to do?

    Robert Axle spec’ed the perfect solution. Perfect size. Perfect machining. I plan to ride the same axle on the road this spring!

    Highly recommended.

  26. Andrés Cabrerizo (verified owner)

    Eje perfecto para Orbea Avant con frenos de disco y cualquier rodillo.
    Perfect axle for Orbea Avant with disc brakes and any trainer.

  27. Jeff Hamilton (verified owner)

    Great product, using it for a trainer. Worth the price

  28. Caroline (verified owner)

    Bought this to use on my Quintana Roo PRsix disc brake tri bike with thru axle while on my trainer. It is the perfect fit. Super easy to use and fits perfectly with my trainer. Definitely recommend it !

  29. Larry Herriman (verified owner)

    Great product. Perfect fit and easy installation on my bike when I ‘need’ to use the trainer. I tried other axles and the extra tools and multiple washers were a hassle. Plus, they wouldn’t fit my trainer! This axle is simple and can be left on the bike when I’m not using it on the trainer.

  30. Kristy (verified owner)

    This is exactly what I needed. I went through 2 different adapters specific to my trainers brand. Finally found The Robert Axle Project, made my life so much easier! Great quality and the team who runs it is even better. I recommend them through and through.

  31. Matt P (verified owner)

    This Axle came recommended from the team at STAC for their Zero trainer, now that I got a new bike (Argon 18 Dark Matter). It shipped very quickly, and it’s working like a charm.
    10/10 will continue to support RA Project in the future.

  32. Joe (verified owner)

    Works great. Wish you made a complete solution for the Tacx Neo! Thru axels are a real pain in those trainers.

  33. Phil Doak (verified owner)

    Excellent service. I had just purchased a new Pinarello with disc brakes and I needed a trainer axle for my Cyclops Fluid. The website made the selection very easy and it arrived before I expected! Good stuff

  34. Shewey

    Brilliant, I can now use my disc brake Ridley Noah Fast with my ageing (but still performing well) Racermate Computrainer turbo.

    I needed the Robert Axle Project Turbo Trainer 12mm Thru-Axle – M12 x 1.5 – 159/165mm, with the supplied chunky spacer washer installed on the non-drive side.
    The fit to get the axle ends inside the frame is a little tighter than with a Quick Release, but perfectly doable without any modifications needed.
    The result is the bike is held securely.

    It’s a nicely finished axle too, it exudes good quality and craftsmanship.
    Thanks for making this item, The Robert Axle Project.

Add a review


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: $12.50 USD, 10-14 business days

• All other International: $12.50 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.

Also Fits Your Bike

By continuing to use the site, you agree to the use of cookies. more information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.