15mm Thru Axle Replacement





COVID-19 UPDATE: We are fortunate to be able to continue shipping all orders on a daily basis while taking precautions to protect our employees.

thru axle finder


Our Thru Axle Finder Guarantee.

Robert Axle thru axles are designed and made to fit YOUR bike and YOUR needs! That’s why we’ve created this handy Thru Axle Finder so you can easily find the exact axle you need. When you use the Axle Finder, we Guarantee The Result of the Finder, 100%

bike touring with family and Thule trailer

Thru Axles for Bikes: 12mm and 15mm Thru Axles

The Robert Axle Project makes thru axles for bikes. Replace your stock axle with a lightweight Lightning Bolt-On Axle or tow your kids with our Kid Trailer Axle. Our products allow cycling families, adventurers, commuters and enthusiasts to enjoy traveling by bicycle without leaving their cargo behind.

With our thru axles, you can lighten up your bike or attach your favorite bike trailer. We have thru axles for Burley Trailers, Thule Trailers, BOB Trailers and more—to any bicycle that has a 12mm thru axle. Find a thru-axle for any mountain, fat, road, cross, and electric bikes.

Your Best Bike. Your Best Adventure.

We are the Bike Thru Axle Experts

We understand that there are two priorities for you. Our product must provide a seamless fit between you and your beloved bike and your precious cargo. And it must be durable and secure to bring you home from your adventures, whether around town or around the world. Each axle is specifically engineered and produced to provide a safe and secure connection.

Designed, tested and made in Bend, Oregon, USA.

Robert Axle Project Trainer Axle on a blue background

Over 1,400 5-Star Reviews and Counting!

Five Gold Stars

This is a quality axle that works great! We’re very satisfied with it. This company is great with awesome customer service – with my order I asked them to include a drawing of a dinosaur riding a bicycle, and the CEO drew the cutest dino on a bike! I was so excited to open my package and see the drawing!

I recently purchased an axle for my BOB trailer and couldn’t be happier. From the axle finder tool through to the fast processing and shipment of my order, and even the installation how-to video, everything with the process was smooth and easy. The axle fits perfectly and installation was a snap. I would (and will) wholeheartedly recommend the Robert Axle Project to anyone looking for a thru-axle trailer mount.

This axel worked great so I can now pull my twins in our chariot on my mountain bike. Easy instructions, great website. Thanks!

NEW! Wahoo KICKR Thru Axle Adapter Kit


The Wahoo KICKR Thru Axle Adapter Kit kit provides a stable and secure fit between your 12×142 or 12×148 thru-axle bikes and your KICKR smart trainer.

Our trainer side adapter is firmly held in place making it easier to attach and remove your bike from the trainer.

Designed to support and protect your bike the same way a thru axle does so there is no undue stress applied to your frame.

This kit is made for the 2014 and 2016 KICKR models that require a thru axle adapter kit to work with thru axle bikes. Also the orange anodizing just looks rad.

2016 Wahoo KICKR Thru axle adapter

Latest News

25% Off Sitewide for BLACK FRIDAY! Now's the perfect time for some ultralight and stiff LIGHTNING AXLES, or our DRIVE THRU DUMMY HUB to keep your drivetrain sparkling clean!


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