Lightning Bolt-on Axle – Front 15 mm x 158 mm x M15 x 1.5 Thread

Lightning Bolt-on Axle – Front 15 mm x 158 mm x M15 x 1.5 Thread

(6 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. This axle fits RockShox forks with 15 x 110 Boost hub spacing.

SKU: LIG503 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.



  • This axle fits RockShox forks with 15 x 110 Boost hub spacing.
  • The diameter of this axle is 15 mm and the true length of the axle shaft is 158 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 15×100 hub does not equal a 100 mm long axle.
  • This axle has a M15 x 1.5 mm thread pitch
  • Weight: 49 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 6 mm 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?

6 reviews

  1. Kelly Simpson (verified owner)

    Great axle for my bike. It went on my bike in seconds and secures wheel much better than a QR axle ever did.

  2. Christopher R Dodson (verified owner)

    Secure,low profile, perfect fit, works and looks better than a clunky qr.
    Ordering and shipping were quick and easy.
    Love it!

  3. Jack Adler (verified owner)

    Really wanted to replace my stock QR axle with a lightweight, good looking, strong axle. So glad I discovered the Robert Axle Project. Fit the bill exactly, front and back.

  4. Dave P (verified owner)

    I purchased this axle using the fit finder since the Rock Shox SID Ultimate fork wasn’t in my possession yet. Turns out the boost axle that came with it was 10mm shorter than the RAP 158mm that arrived. I contacted Tory in C/S and emailed some pictures to her to show I indeed did have boost spacing on the fork. She did everything I hoped she would in the circumstance by refunding part of the purchase price so I wasn’t out of pocket with having to return the axle and is contacting SRAM to verify what has changed with their fork dimensions. I’m very pleased with the service I received and wouldn’t hesitate to purchase again or recommend someone else does.

  5. N. Bret Fischer (verified owner)

    Great product, fine machining. Fits perfectly. Very easy ordering on the website. Glad I made the purchase, no more fumbling with QR thru-axles.

  6. Eric A Hart (verified owner)

    Love it! Secure mounting and cleaner look.

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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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  • Purchase Robert Axle Thru axles and Hexlox locks for both your axles and for other vulnerable components.

    Here’s how:

    1. To secure your Lightning Bolt-On Axles, you’ll need one 6mm Hexlox for each axle. These include the magnetic insert for our axles which, since they are aluminum are not magnetic.
    2. Add at least one key to install and remove your Hexlox system. You will receive a key which matches the Hexlox you order. Order multiple keys if you want a spare.
    3. For other all other components, check your bike for what you want to secure. Options include Hexlox’s that fit in 4mm, 5mm and 6mm bolts, so check your bike and purchase what you need!
    4. Don’t forget to go here (link) and order our Lightning Bolt-on Axles  for your bike. Enter your bike information into our Fitment Selector database.
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