12mm Thru Axle for Trainer: 170mm x 1.75mm Thread

(11 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.

Cervelo owners with RAT thru axles: This axle will replace the RAT axle found on all of their RAT equipped bikes. In addition to this axle you will need to replace the RAT compatible derailleur hanger with Cervelo threaded hanger Part Code: DRH-WMN112. This axle combined with the replacement derailleur hanger will provide a complete threaded thru axle system. If you don’t know what “RAT” is then this message is not for you, but the axle still is.

In stock

Get 20% Off Lightning Bolt-on Axles With Purchase of Any Trailer or Trainer Axle! Discount Automatically Applied.
SKU: TRA223 Category:


  • This Trainer Axle is designed to adapt your high quality bike to your on-wheel trainer. These are compatible with all the popular brands: BKool, Blackburn, Cyclops, 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 5mm 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 15mm past your frame on each side.


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 www.P65Warnings.ca.gov.

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 BKool, Blackburn, Cyclops, Kinetic, Tacx, Wahoo and many other on-wheel resistance trainers.
  • The true length of the axle shaft is 170 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 1.75 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 5mm hex wrench.
  • Designed, built and quality tested in the USA. Proven around the world


Need more information about how our axles work?

11 reviews for 12mm Thru Axle for Trainer: 170mm x 1.75mm Thread

  1. Ian Sorensen (verified owner)

    Works perfectly on my Cervelo S3d. You can just leave and forget!

  2. Bob (verified owner)

    Great axle fit my Cervelo C3 perfectly. makes using my trainer simple. Can leave it in or take it out and pop my Road use axle.

  3. Jeff (verified owner)

    The perfect bridge between my 25 year old fluid trainer and my brand new Cervelo C5. Well made, perfect fit, met all expectations. Not the cheapest thing but file this one under “you get what you pay for”.

  4. Tom (verified owner)

    Perfect fit for my cervelo. Not cheap but needed. Recommend it.

  5. luanne letarte

    It fit my Cervelo perfectly. I thought I might have to buy a new trainer it was gonna cost me a lot more. I will definitely buy from them again

  6. Erika (verified owner)

    Fit perfectly. Not cheap, but necessary. Quick shipping as well.

  7. Mark (verified owner)

    Like everyone else says, absolutely perfect fit on my Cervelo P-105. Process was easy to find out what I needed. Instructions are clear and concise. Worth every penny, you get what you pay for… quality & precision.

  8. Ethan K

    Axle slid right in and works great.

    Great customer service. I accidentally checked out with two in my cart and they quickly processed the return of the second.

    All around great experience.

  9. Diego Calderon (verified owner)

    Easy to use website and quick delivery.

  10. Rudy-Desoto,TX

    Fits perfect to my Cervelo P Series and no problem sitting on CycleOps trainer. Thank you!

  11. Lisa (verified owner)

    The axle is perfect for my Cervelo P-105 (tri bike) with an old school Kurt Kinetic road machine. The instructions were great, I was able to set it up with my zero mechanical abilities. It shipped to Canada quickly (and I wasn’t even charged duty or taxes!) Thanks so much!

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