The Evolution of RATHE Rims: From 290g to 240g Designed for Performance and Durability

Cyclists know that every gram counts when it comes to performance, especially in cross-country (XC) racing. Over the past four years, RATHE rims have undergone a remarkable transformation, shedding weight while maintaining strength and reliability. This blog post explores the journey of RATHE rims from their original 290 grams to an ultra-light 240 grams, designed to support riders up to 100kg without compromise. We will dive into the technical challenges faced, the innovative solutions developed, and how these changes meet the demands of serious XC riders.

Shedding Weight Without Losing Strength

When RATHE first introduced their rims at 290 grams, they set a high standard for lightweight performance. However, the goal was always to push boundaries further. Reducing rim weight to 240 grams was ambitious, especially while keeping a rider weight limit of 100kg. This balance is critical because ultra-light rims often sacrifice durability, leading to issues like rim folding or failure under stress.

The team focused on refining the rim lay-up, which is the arrangement of carbon fiber layers. Each layer’s orientation and thickness affect the rim’s strength and stiffness. Early attempts to reduce weight by simply removing material led to weak points and inconsistent performance. This challenge required a fresh approach beyond traditional lay-up techniques.

Challenges with Lay-Up Changes

Adjusting the lay-up to reduce weight is a delicate process. Carbon fiber composites rely on precise layering to distribute forces evenly. When layers are too thin or misaligned, the rim can lose rigidity or become prone to damage. PORTE engineers experimented with different fiber orientations and resin types, but these changes alone couldn’t achieve the desired weight without compromising strength.

Another issue was the rim’s tendency to fold under lateral forces, especially during aggressive cornering or impacts. This folding not only affects performance but also risks rider safety. The team realized that a new rim shape was necessary to address these problems effectively.

Introducing the Polyhydral Technique

To overcome these challenges, PORTE developed a new mold using the polyhydral technique. This innovative shaping method creates multiple small angles along the rim’s profile instead of a smooth curve. These subtle facets increase the rim’s rigidity by distributing stress more evenly and preventing deformation.

The polyhydral shape acts like a series of tiny reinforcements, making the rim stiffer without adding weight. This design also helps resist folding, a common problem with ultra-light rims that have thin walls. By combining the polyhydral shape with optimized lay-up patterns, PORTE achieved a rim that is both lighter and stronger.

Testing Strength at efbe

To validate the new design, RATHE rims underwent rigorous testing at efbe Prüftechnik, a leading independent testing facility for bicycle components. The results were impressive: the new rims demonstrated a 50-55% increase in strength compared to previous models.

This significant improvement means riders can push harder on technical trails without worrying about rim failure. The enhanced durability also extends the rim’s lifespan, making it a smart investment for serious XC riders who demand both performance and reliability.

Designed for the Demanding XC Rider

The new POLYHYDRAL rim design targets the more demanding XC rider who values speed, control, and durability. The rim features a bold red logo that reflects a racing attitude and commitment to high performance. This visual update signals the rim’s advanced engineering and competitive spirit.

Beyond aesthetics, the rim’s improved rigidity and strength translate into better handling and confidence on challenging terrain. Riders can expect sharper cornering, more efficient power transfer, and resilience against impacts—all while enjoying the benefits of a lighter wheelset.

Practical Benefits for Riders

• Weight Remains: 250g reduces rotational mass, making acceleration and climbing easier compaired to 290g.

• Increased Strength: 50-55% stronger rims withstand rough trails and aggressive riding.

• Rider Weight Limit Optimized: Supports riders up to 110kg without compromising safety.

• Improved Handling: Polyhydral shape enhances rim stiffness, reducing flex and improving control.

• Durability: Resistant to folding and damage, extending rim life and reducing maintenance costs.

  
  

What This Means for Your Ride

For XC riders looking to upgrade, the new POLYHYDRAL rims offer a compelling combination of lightness and toughness. Whether racing or training, these rims provide the confidence to tackle technical sections and push your limits. The innovative polyhydral design is a clear example of how thoughtful engineering can solve real-world problems faced by cyclists.

If you are considering new wheels, look for rims that balance weight and strength like PORTE’s latest model. The difference in ride quality and durability can be noticeable, especially over long distances and rough terrain.