Like many cyclist, Charles wanted to stay in riding shape through the winter.  He wanted an indoor riding experience that kept him engaged mentally and physically, so he began riding rollers.  Like most people, he immediately experienced the inherent instability of traditional rollers. 
As an engineer, Charles knew there had to be a better way, and he knew that the shape of the roller was the key. 
Armed with his engineering mind and a 3D printer, he set off to discover the most substantial innovation to cycling rollers in years.  
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  • Version 1, the intuitive shape:  A shape that is narrowest in the center and widest at the edge.  This shape made sense, the wheel should drop to the center of the trough...right?  Not quite.  

  • Version 2, the counter-intuitive shape: A shape that is widest in the center and narrowest at the edge.  This shape shouldn't work.  It should feel like riding a balance beam...right?

  • Final Version, counter-intuitive wins:  Physics loves the counter-intuitive shape.  Since a smaller roller has more rolling resistance, and a larger roller has less rolling resistance, the wheel wants to take the past of least resistance.  With Crown Rollers, this location is in the center of the roller.  

The Process

Innovation is a process.  We designed, 3D printed, and tested numerous variations of the CROWN Roller.  

Some worked well and pointed us toward the World's most stable cycling roller.  Others were failures at the least and down right dangerous at the most.

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Version 1: The Intuitive Shape was not the answer. It turns out that this is the exact opposite of the most stable shape for a cycling roller.


Version 2.0: CROWN Roller is born.


Version 2.2: CROWN Roller is improved.


Version 2.3: The rough draft of what will become the most innovative, stable, easiest to ride cycling roller is complete.


Crown Roller, the most stable, best, easiest, most fun cycling roller trainer.


Wood is good! We turned out a custom pair of Wooden Crown Rollers.


Wood is good! We turned out a custom pair of Wooden Crown Rollers.


A little too-Crown Roller. Finding the optimal pitch and width was one of our early challenges.


A collection of the various Crown Roller iterations. Making the most innovative, easiest to ride cycling rollers takes took numerous versions.

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Are your rollers stable enough to find Waldo while riding?