biking across desert with trailer



The Robert Axle Project

bike touring with family and Thule trailer

12mm Thru Axles for Bike Trailers

The Robert Axle Project makes 12mm thru axles for bike trailers, trainers and accessories to make your best bike fun and functional. 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 attach your favorite bike trailer—Burley, Chariot, Thule, BOB and more—to any bicycle that has a 12mm thru axle. We have 12mm thru axles that fit mountain, fat, road, cross, and electric bikes.

Your Best Bike. Your Best Adventure.

We are the Thru Axle Solution 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 attach that particular trailer, providing a safe and secure connection.


Our products are designed, tested and manufactured in the USA.

Latest News

By continuing to use the site, you agree to the use of cookies. more information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.