12mm Thru Axle for Trainer: 172 mm with 1.5 Thread

Rated 5.00 out of 5 based on 21 customer ratings
(21 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: TRA204 Category:




21 reviews

  1. Rated 5 out of 5


    Great product from these guys. Use mine all the time and also works well as an upgrade from the stock TA on pretty much any bike. Seems to have better tolerances than the DT Swiss one that came with my bike and eliminated the creaking that would occur due to DT’s slack tolerances.

  2. Rated 5 out of 5

    Danno (verified owner)

    I was a little worried at first that I would have to return my trainer. RAP had just what I needed. I printed out the guide and used it to cut out the guess work. I got the right one within days.

  3. Rated 5 out of 5

    Chris Kuhl (verified owner)

    Awesome product, very fast shipping. I was surprised when I couldn’t find a 12x142x1.5 axle for my Marin hard tail 29er so I could use it on my trainer. This jus the solution and works great, the quality is very nice, highly recommended.

  4. Rated 5 out of 5

    J black (verified owner)

    Works as advertised. Shipping was very quick, especially for the time of year the order was placed. Thanks.

  5. Rated 5 out of 5

    Pierre (verified owner)

    Ordered this axle for my Yeti SB4.5c.
    In order to fit the axle, I had to remove the lock nut on the drive side and add a washer.

    With this modification, I was able to use my Yeti on my home trainer

  6. Rated 5 out of 5

    Mike (verified owner)

    Robert Axle Project was recommended to me by the team at Raleigh for my Merit. What a perfect solution! The axle has been a great fit for my CycleOps PowerPro. Easy to install, and works wonderfully with both systems. There was a point where I started to doubt that a solution existed for the wide drop-out on the Merit, but this was perfect.

  7. Rated 5 out of 5

    DocWass (verified owner)

    Exactly what I was looking for! My new bike has 12mm thru-axles and came with a kit to change out the rear to QR drop outs so I could use it on the trainer. I didn’t want to hassle with changing back to 12mm for road riding and the 5mm QR drop outs looked like they would flex. Found these and initially thought they were a bit expensive but the reviews persuaded me to part with the money. The fit/finish is excellent and the bike fits securely in the trainer. The added bonus is I don’t have to change it back for road riding. Perfect!

  8. Rated 5 out of 5

    Shawn Chervak (verified owner)

    I searched on the internet then called Diamondback to confirm length and pitch. They recommended these axles over anyone else, which eliminated any doubt for their axle to work. It’s simple and perfect, works great with my trainer that I have left the axle in when I do head outside. Even with a recent puncture there was no more of an incovience in pulling the axle out to patch the tube.

  9. Rated 5 out of 5

    Logan (verified owner)

    Works great! Almost thought I had to return the trainer I purchased. Chart made it easy to make sure I got the right size!

  10. Rated 5 out of 5

    Chris (verified owner)

    Great Product MADE IN USA! Was bummed when I bought my new Salsa Warbird and couldn’t find a thru axle to fit my trainer. Salsa actually recommended RAP! Great company, in stock products, fast shipping= Happy customer!

  11. Rated 5 out of 5

    Patrick (verified owner)

    great product, only 4 grams more than the stock thru-axle bolt.

  12. Rated 5 out of 5

    Lee Waldman (verified owner)

    These guys are great. They had what I needed when no one else did. I received my product quickly, the price was fair and they are great about responding to questions. I wouldn’t hesitate to deal with them again when the occasion arises

  13. Rated 5 out of 5

    terry (verified owner)

    great product works well with my trainer – perfect fit for the bike ! delivery to New Zealand only took a week ! would definitely shop with again

  14. Rated 5 out of 5

    Joe Janney (verified owner)

    Great product. My wife and I both use our Wahoo Kickr Snap trainer with bikes having different axles. The Robert Axle Project axle allows us to quickly swap out our bikes without making changes to the trainer. My wife’s bike has a standard axle that fits with the rear axle equipment the Kickr Snap provides. My bike has the through axle that would have required me to buy a conversion kit from Wahoo at $80, then swap out the two different axle holders on the trainer when moving between bikes. I saw a note posted on Wahoo’s site about the Robert Axle Project and found this site and purchased the trainer axle that fits directly on the Kickr Snap trainer without the conversion kit. You should contact Wahoo and see if they would sell your product on their site vs. the conversion kit. This is a much better solution. Keep up the good innovative engineering!

  15. Rated 5 out of 5

    khanh (verified owner)

    Quality product, arrived very quickly and by using the print out to get the correct thread pitch, length it fit perfectly for my Pinarello Dogma F8 on the Wahoo Kickr Snap

  16. Rated 5 out of 5

    Brian (verified owner)

    I bought an axel for my 2017 Fuji Jari to pair with a Wahoo Snap Trainer. The installation was easy and it works perfectly with both the bike and the trainer. I’ve put about 200 miles on the axel so far and it works great. No complaints and I’d recommend it in a heartbeat.

  17. Rated 5 out of 5

    Curtis (verified owner)

    Good stuff! Perfect fit, clean look, does exactly what it is supposed to.

  18. Rated 5 out of 5

    Erik S (verified owner)

    Exactly what was needed, this fits on the trainer perfectly plus I can remove one side of it if I want to and just run it as a normal axle that fits flush to the bike. Better than the stock axle!

  19. Rated 5 out of 5

    Thomas (verified owner)

    Perfect fit for my trainer. Fit my bike like a glove too!

  20. Rated 5 out of 5

    Bob Grier (verified owner)

    12mm 172mm w 1.5 thread – Perfect fit (with the one washer that was included without my request) for my Wilier GTR Team Disc and CycleOps Fluid trainer. The Robert Axle Project team handled my pre-sale question quickly and the entire process was seamless. Thanks very much!

  21. Rated 5 out of 5

    Nathan Morgan (verified owner)

    Solid Product and very well made. Would like to see a captive washer rather than a free one so I won’t lose it, but then it might not fit on every frame. Bought the lightning bolt on axles as well. Nice ’80’s reference to boot. What’s not to like?

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.