NEXTIE is proud to introduce the Alpha 50 — our latest top-level carbon road rim engineered for competition-grade performance. This article covers its key innovations, material breakthroughs, and rigorous test results.

For top-level road bike rims, it is different from mountain bike rims. Light weight is not the primary goal for road rims. The goals of road rims are to achieve a balance between optimizing the weight of the rim and ensuring a certain rotational inertia, excellent dynamic balance, sufficient stiffness to make the rim achieve a smaller deflection, better wind-breaking performance to increase riding speed, and greater strength. The newly launched Supreme Edition Alpha 50 carbon road bike rim embodies our revolutionary solution, incorporating multiple core technological innovations.

We specially designed the rim shape at the spoke hole position, developed the advanced single-point reinforcement technology specifically for Alpha 50, which results in rims that are lighter and stronger, 325g only. At the same time, this new design gives us more maneuverability, distributing the weight more toward the edge of the rim, thereby increasing the rotational inertia of the rim, which plays an important role for a top-level road bike rim.

Alpha 50 pioneers the use of Toray T1100 and M46J aerospace-grade carbon fiber as its main structural material, making rim much stronger. This is the first time we apply "M-series" carbon fiber materials to manufacture bicycle rims. As we know, the terms "T-series" and "M-series" refer to classifications of Toray carbon fibers, specifically T-series for tensile strength and M-series for modulus (stiffness). M46J has better stiffness performance than T-series like T800, T1000 or T1100. The addition of M46J materials can effectively improve the rotational deflection and stability of the wheels.

We reduce the weight of Alpha 50 by the advanced single-point reinforcement design on the spoke hole side and materials improvement. On the rim bed side, we apply the latest layer-up structure to optimize weight distribution, which results in the high improvement of rim's rotational inertia. At the same time, all-wrapping technology (AWT) for main carbon fiber structure applied on Alpha 50 further improves the stability and stiffness. AWT ensures the integrity of the carbon fiber material, thereby ensuring the rim's stability and stiffness. AWT is also applied on our road bike rims of Ripple series and Ocean series.

We applied the UCI test conditions to test Alpha 50 carbon rim. The impact test result was 110J. This is much higher than the UCI's qualified strength standard for road bicycle rims. This strength performance is almost close to ASTM Classification Condition 4. IMPACT TEST VIDEO.

Beyond these core innovations above, Alpha 50 carbon rim incorporates numerous advanced manufacturing techniques including precision carbon fiber cutting, optimized mold materials, refined production processes and wheelset temperature test under 80 ℃ for 4 hours - collectively establishing Alpha 50 carbon rim as the ultimate road bike competition-grade product.

This rim could be used for Road. Triathlon. Cyclocross. Dirt. Gravel and Adventure riding. The tire size for this model of rim is recommended at 28 ~ 53mm Road / 28 ~ 40mm Cyclocross / 28 ~ 60mm Gravel. The tire pressure is recommended at 30 ~ 90psi Road / 25 ~ 54psi Cyclocross / 27 ~ 79psi Gravel.

* Impact Test 4 at 120J represents the failure threshold, confirming that 110J is the validated safe maximum for production rims.

On 8th October 2025, the Alpha 50 wheelset was awarded UCI quality certification. The information is published as follows:

Carbon Rim(s)