12mm Thru Axle for Resistance Trainer and FOCUS R.A.T. – 12×142 or Boost

(9 customer reviews)

$ 64.00

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.

An additional benefit you will experience, once you switch to our threaded trainer axle, when riding outside with this axle your disc brake will no longer rub. This is due to the more consistent and greater clamping force of a threaded thru axle vs the RAT system. Consider our Lightning Bolt-on Front axle to rid your bike of the flex from the R.A.T.

This axle is specific to bikes with FOCUS R.A.T. thru axles and 12×142 or Boost hub spacing. Includes a replacement R.A.T. nut with the Trainer Axle.

In stock

Get 20% Off Lightning Bolt-on Axles With Purchase of Any Trailer or Trainer Axle! Discount Automatically Applied.
SKU: TRA214.F Category:


This thru axle is specific to bikes with FOCUS R.A.T. thru axle systems with 12x 142 or Boost hub spacing.

  • This Trainer Axle is designed to adapt your high quality bike to your on-wheel trainer. These are compatible with all the popular brands: 1up, 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 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.


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.


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 resistance trainers and FOCUS bikes with the R.A.T. thru axle system and 12×142 or Boost hub spacing.
  • Includes a replacement R.A.T. nut.
  • This axle is compatible with 1up, Blackburn, Cyclops, Kinetic, Tacx, Wahoo and many other on-wheel resistance trainers.
  • 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?

9 reviews for 12mm Thru Axle for Resistance Trainer and FOCUS R.A.T. – 12×142 or Boost

  1. Roger (verified owner)

    Great for the rear Wheel
    Easy to work with when getting a flat
    The R.A.T. Was hard to get all the way in,especially with a heavy Wheel
    Rat is great for the front one
    Very happy with the Robert Axle unit ??

  2. Ron Patch (verified owner)

    If you have a Focus bicycle With R.A.T. Axels and want to use your bike on a trainer, this is the axel to use! Meticulous design and works flawlessly. I am using mine with a Wahoo Kicker trainer.
    It works so well that I will be upgrading my existing axels on my bike to for riding and racing (different axels), but based on my experience with this trainer axel it is a no brainer. Thanks again for a great product that is far superior then the oem R.A.T. Axels.

  3. Joseph Clark (verified owner)

    So far so good. Bought to put my Focus Mares on the trainer. I’ve rode it on the road but I really don’t pay attention to how it felt before or after but it does work great on trainer. Too bad I moved to an area where I predominately use this bike on trainer now. Miss my trail riding. Ugh.

  4. Anders (verified owner)

    Nothing bad to say about this axle. Works like a treat, easy installation and great build quality.
    I will use this one for indoors and outdoors.
    Only wish were to have it in black but maybe the colour would come off on the trainer anyway, but no big deal.
    Got the front axle too!

  5. Magnus (verified owner)

    So happy to have found this when I understood that my Focus Mares needed an adapter for the trainer I bought. Good and simple instruction – worked like a charm

  6. DIEGO García (verified owner)

    Excellent product! It perfectly replaces my RAT axle to mount my Focus on a Zycle Z Pro.

  7. Kristijan (verified owner)

    It fit’s perfectly on my Focus Paraline. High quality and fast delivery from US to EU

  8. Elina (verified owner)

    Perfect for my Focus Mares and Kickr Snap combination. Fast delivery from USA to Finland. Easy to install.

  9. Liz

    Exactly what I needed for attaching my Focus Paralane to Wahoo trainer. Outstanding quality.

Add a review

Your email address will not be published. Required fields are marked *

You may also like…

  • Robert Axle Project Cycling socks by The Athletic

    Robert Axle Project Socks

    $ 20.00
    Select options
  • bob trailer axle for focus RAT

    Thru Axle for BOB Trailer: Focus RAT Bikes – 12×142 or Boost

    $ 72.00
    Add to cart
  • Kid trailer axle for FOCUS Boost axle

    12mm Thru Axle for Kid Trailer: FOCUS R.A.T. Bikes – 12×142 or Boost 12×148 hubs

    $ 68.00
    Add to cart
  • thru axle for focus bike 12mm LIG.F_Focus

    Lightning Bolt-on Axle – Front for FOCUS R.A.T. Bikes

    $ 52.00
    Add to cart