12mm Thru Axle for Trainer: 167mm with 1.75 Thread

12mm Thru Axle for Trainer: 167mm with 1.75 Thread

(18 customer reviews)

$ 54.00

Our Trainer Axle is designed to adapt your thru axle equipped bike with your wheel-on 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: TRA221 Category:


Additional information

Weight 0.3125 lbs



18 reviews

  1. Brandon H (verified owner)

    This was the only axle that fit into an older compu-trainer my cycling coach is using because all other axles stick out too far on either side of the bike. After following the sizing guides, this axle perfectly fit my Trek Domane SL8. It is very good quality, fits the trainer perfectly, looks great, and was shipped very quickly. I’m very happy with my purchase and would definitely recommend this to others.

  2. Bill (verified owner)

    Proper axle fit, excellent service and shipping. Will use again.

  3. Antonio B (verified owner)

    Very good product and well finished.
    I used it to install my Trek Emonda 2019 on Tacx Vortex. Shipped in few days in Italy. Very satisfied!
    Thanks a lot!

  4. Levi Hill (verified owner)

    This was a gift for my father. Perfect fit, excellent service, speedy shipping. Love the axel finder feature.

  5. Esteban (verified owner)

    Whas exactly what I need. very good product. I will install in my Trek Checkpoint 4L. thank you very much!

  6. Mike (verified owner)

    Mounted a 2019 Norco x6 on an old cycle ops fluid trainer. Axle fits really well, some concern about environmental seal for outdoor use due to the inset nature of axel access on the Norco frame. It seems to work well on the trainer but will switch back to manufacturers’ axle for outdoor rides.

  7. Jeffrey Roger (verified owner)

    Hey, Hey, Hey!!!!

    This is the through axle trainer adapter you have been looking for.

    I too am riding a Computrainer and a Trek Domane SL7 with disc brakes and Ultra Di2 11 speed and after jerry-rigging a solution for 2 weeks I heard about teh Rober Axle Project from a friend in Bend.

    It arrived 3 days after ordering it and it took about 3 minutes to get it set up and m indoor training has never been better.

    I broke the frame from my Domane 5.9 in the Computrainer from the previous clamp on QR attachment. The Through axle puts so much less stress on teh rear dropouts (if any) and I am in Zwift heaven.

    Thanks tons!


  8. Jonathan B (verified owner)

    Ordered this axle for my 2019 Trek Emonda after getting an old Cyclops Fluid2. Axle finder made it easy to find exactly what I was looking for. Excellent service and shipping. Axle fit perfectly in bike and in trainer. Hopefully I won’t need a new axle for a long time, but definitely will be coming back here when I do.

  9. Ben (verified owner)

    Installed on a 2019 Trek Emonda SL6 for my Kinetic Road Machine, works great!

  10. Matt (verified owner)

    Purchased after getting a badly fitting axle from Amazon..promptly returned. The axle from RAP is a perfect fit for my Trek 2020 Émonda SL5 Disc. Precisely engineered, sturdy enough to leave in whether on/off the trainer, and very rapid shipping.

  11. Mark Werner (verified owner)

    Absolutely thrilled with this company and the product. I wanted a quality thru-axle at a fair price in order to use my Trek FX 5 Sport on my wheel-on trainer. I looked at the kit from my trainer manufacturer, but you couldn’t leave their axle in all the time. Seriously? If it rains one day and then is beautiful out the next, I don’t want to have to constantly swap out the axle depending on whether I’m riding on the trainer or outside.
    The fit, form and function of the product is excellent and having the axle finder tool on the site gave me confidence I was purchasing the right product. A complete home run!

  12. John V (verified owner)

    Worked well to fit my wife’s new Domane onto our old 1UP trainer. Well made, great fit, arrived quickly.

  13. Jahir Hussein Mohd Haniff (verified owner)

    2nd time ordering an axle from them. Top rated and highly recommended for your axle needs Specs are well detailed during the order process ensuring you buy the correct axle.
    Item was shipped almost immediately upon ordering and received 3days later in Singapore.
    Nothing but praises for the way you conduct your business. Well done , keep it up.
    I am a FAN!

  14. Russ (verified owner)

    The only word to describe this axle is PERFECT. Other products (which cost about the same) are made to fit a variety of threads and lengths which suits them but not me. I only have one bike that I will be using this on. And that added versatility in the other products makes it more challenging to take off and put on when I want to pull my bike off of the trainer and ride outdoors. No thanks. I’ll take the Robert Axle Project. Perfect fit and easy to take off and put on when I want to go outside. And I only do that because I have a dedicated wheel and tire for use on the trainer. If I didn’t, I could just leave it on. Rock solid.

  15. Kelan (verified owner)

    Perfect. Exactly what I needed to get my Trek Madone on the trainer.

  16. Bart Tate (verified owner)

    I searched and searched for a way to put my Madone on an old trainer (non-smart). Found RAP but was still a bit skeptical. However, these guys have it figured out and I now know they’ve done their homework. This axel works beautifully. Although I hate riding indoors this has allowed me to get 5 rides in already and will let me stay in shape over the winter/dark after work months. Thanks guys for figuring this out and allowing us who could afford the bike but can’t afford the smart trainer to go with it to keep cycling in winter. Love my axel!!

  17. Andrew L Harmon (verified owner)

    Fits absolutely perfect on my Trek Checkpoint AL4 and my Wahoo Kikr Snap! Fast shipping and great product.

  18. Rob Lisy (verified owner)

    Perfect. No problems, fit on the first try, easy to install.

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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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