Lightning Bolt-on Axle – Front 12 mm x 122 mm x 1.75 Thread

(22 customer reviews)

$ 42.00

After years of mountain biking with thru-axles with bulky handles that seemed to strike every trailside obstacle, we needed a better option.

Our Lightning Bolt-On thru axles offer the highest quality, simple, lightweight alternative to that bulky handle. Available in a range of sizes that fit both front and rear wheels on all types of thru-axle equipped bikes. Learn about compatibility with Hexlox security systems.

In stock

Get 20% Off Lightning Bolt-on Axles With Purchase of Any Trailer or Trainer Axle! Discount Automatically Applied.
SKU: LIG512 Category:


  • Lightning is Better. Our front and rear Lightning Bolt-On axles offer a stronger, more durable, lower profile and lighter weight option to replace your stock thru-axles.
  • Low Profile. No more bulky handles to strike trail obstacles or create wind drag. Aerodynamic design.
  • Light Weight. Our axles are internally bored to remove unnecessary material without compromising strength.
  • Easy to install. Our matching front and rear Lightning Bolt-On Axles only require a standard 6 mm hex wrench for easy installation and removal.
  • Better Tolerances. Manufactured in the USA to the tightest tolerances using aerospace materials and CNC manufacturing. No longer will your axle loosen while riding.
  • Available Security. Learn about compatibility with Hexlox bike security systems.

This is NOT an axle for attaching trailers or trainers.



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


  • The diameter of this axle is 12 mm and the true length of the axle shaft is 122 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 12×100 hub does not equal a 100 mm long axle.
  • This axle has a 1.75 mm thread pitch.
  • Weight: 31 grams
  • The axle is precision CNC machined in the USA from 7075 aluminum and hard anodized for rugged durability. Our axles are built to the tightest standards in the industry.
  • No special tools required. Design allows for installation or wheel removal using your standard 6mm hex wrench.
  • Designed, built and quality tested in the USA. Proven around the world.
  • Learn about compatibility with Hexlox security systems.


Need more information about how our axles work?

22 reviews for Lightning Bolt-on Axle – Front 12 mm x 122 mm x 1.75 Thread

  1. Mike (verified owner)

    I purchased 2 sets of thru-axles from The Robert Axle Project. One set was for a cross bike and the other for a fat bike. Thus far both have performed flawlessly. Especially noticeable is the weight difference and stiffness vs the stock axles. Thanks guys for a great product.

  2. Brady (verified owner)

    Perfect fit, quick shipping, great way to clean up your axles.

  3. Golfdocs (verified owner)

    Used the online guides to direct me to the exact axle I needed for my bike. It arrived and fit perfectly. It doesn’t rattle or come loose and seems very high quality and fit. Weighs less than my quick release axle that came with the bike. Less to snag my wheel on when riding thru brush. Would definitely purchase again. Thanks for a beautiful product.

  4. Daniel Finnis (verified owner)

    Fits perfectly and is so much less fiddly than the cam-over/QR style that my Checkpoint came with.

  5. Joe (verified owner)

    My second set of Lightning Axles. (new bike for 2nd pair) Website was great help in ordering correct size and threading. Much cleaner look than standard thru Axles. Perform flawlessly. Makes it more difficult to steal wheel and not catch thru axle on other cyclists bikes or other obstacles. Weight savings was nice feature, but not my primary reason.

  6. Matthew Phelps (verified owner)

    Used the measurement guide to find the right axle for my Trek hybrid. Product was shipped and arrived very quickly. You can tell the machining on this axle is very high quality. The fit ended up being perfect, as well as its capability of being used with a Hexlox. Overall, high quality product.

  7. Antonio B (verified owner)

    Very good product, well finished an lighter than original DT SWISS on my Trek Emonda 2019. Shipped in few days in Italy. Very satisfied!

  8. Gerald A Stanley (verified owner)

    Perfect in every way. High quality, easy and precise size calculations, fast shipping, easy installation, and perfect fit. Thank you!

  9. Andy (verified owner)

    Purchased a front and rear axle for my 2017 Trek Domane SL6 Disc road bike and couldn’t be happier. Sizing is perfect and they look great. Much sleeker that the bulky axles that came with the bike originally (DT Swiss) and delivered to Australia directly in less than a week. I noticed that Trek are starting to fit some leverless axles themselves on the 2020 version of the bike but they don’t look or feel anything like as good as the Robert Axle components.

  10. Michael Scott (verified owner)

    I found the Robert Axle Project products on however they didn’t seem to stock the full compliment. I was fortunate to have gone to and search for exactly what I needed. The bicycle search engine was a total lifesaver and took the guess work out of the order. I would highly recommend purchasing direct from the Robert Axle Project.

  11. Ross Paton (verified owner)

    I used the fitting tool on the website which confirmed the axle I needed and it fit like I expected.

    Looks super clean in my bike as well as there is no more chunky lever to look at as I am fighting a headwind or grunting up a hill.

    I ordered it in a Saturday afternoon and it was delivered to my home in Calgary, Alberta mid-day the following Tuesday (this was after waiting months for an order Of a lesser product from e-bay).

  12. Will P (verified owner)

    I purchased a set fork and rear and they have the exact measurement as my bike’s need.
    These are so much lighter than the quick release thru-axle that came with the bike and I do see the benefit of bolt-on as now I don’t need to worry about the lever being caught by shrubs, etc.

  13. Matthew (verified owner)

    Perfect. Nice refresh on 2018 Trek Domane!

  14. Tyler (verified owner)

    This axle fit my 2021 Trek Domane AL3 Disc perfectly. I snapped the original one after overtightening it and ordered this after I couldn’t find any replacement that was the proper size. They shipped it the same day as I ordered and it arrived early in 3 days. The only downside is the whitewall on the outside with their logo, its just a personal preference but I wish it was more discrete, maybe black with white lettering instead. Overall I would definitely recommend their product!

  15. Lawrence (verified owner)

    As mentioned by other buyers, helpful axel selector feature on the website makes buying the correct axel a breeze. I was sure of what I needed but the extra confirmation gave me peace of mind. The thru-axel set I purchased from The Robert Axel Project for my gravel bike look great. I will be adding a set to my mountain bike next.

  16. dingus (verified owner)

    worked, trek made it as hard as possible to find any information on the sizing for my bike but the find your axle system these guys had made it pain-free, thanks my dudes

  17. Paul Thompson (verified owner)

    Thank you!! Couldn’t get this part from Trek. It fits perfectly and arrived within two days. Was really excited that I don’t miss a ride I had planned!

  18. James (verified owner)

    Well, the axle is great but the service is better! On vacation in the Carolinas and lost my axle (As in misplaced). Ordered online, replied to within minutes and riding 48 hours later… I was going to give them five stars but factor in Covid and the crazy world we live in… I’ll go six!

  19. Bogdan (verified owner)

    I purchased a set of axles for a road bike. So far everything worked out without any issues. No long term feedback yet as in Utah is still winter.

  20. MODESTO (verified owner)


  21. Josh (verified owner)

    Instantly stopped the creaking noise I got from the original axles on my bike

  22. Herb Meyerowitz (verified owner)

    Very fast shipping. Axle is light and fits perfectly.

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