World Cup Victory on a Bike with a Gear System

Belt Drive and Central Transmission World Cup Victory on a Bike with a Gear System

2026-09-02 Source: pd-f | Translated by AI 3 min Reading Time

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In the Downhill World Cup, a mountain bike with a gear system and belt drive claimed its first victory. This demonstrates the advantages of the design, which include lower unsprung mass and a centralized center of gravity.

The extreme load spikes experienced in downhill racing serve as the ultimate endurance test for the bicycle industry. (Illustrative image)(Source: © The Little Hut – stock.adobe.com / AI-generated) — The extreme load spikes experienced in downhill racing serve as the ultimate endurance test for the bicycle industry. (Illustrative image)
(Source: © The Little Hut – stock.adobe.com / AI-generated)

On August 23, 2026, drive technology in mountain biking reached a historic milestone. In Les Gets, France, British rider Harriet Harnden (Team Aon Racing) became the first rider to win an Elite Downhill World Cup race on a bike equipped with a carbon belt drive and a central gear shifter. With this victory, she secured the 100,000-euro ($116,000) innovation prize offered by belt manufacturer Gates for the first elite victory achieved using this technology.

Driving Dynamics Through Consistent Weight Transfer

With chain and belt drives, there are currently two market-ready options for power transmission from the crankset to the rear wheel. Both have their advantages.(Source: www.pd-f.de / pressedienst-fahrrad) — With chain and belt drives, there are currently two market-ready options for power transmission from the crankset to the rear wheel. Both have their advantages.
(Source: www.pd-f.de / pressedienst-fahrrad)

For developers and designers in the bicycle industry, this success serves as strong real-world proof of a system that has long been discussed within the community due to its advantages. “At least on paper, geared bikes offer a lot of advantages for downhill riding—including low unsprung mass at the rear wheel, a centralized center of gravity, and the ability to shift gears at any time without having to pedal,” explains Gregor Sinn, editor at MTB-News.de.

Arne Bischoff, an editor at pressedienst-fahrrad (pd-f), explains the conceptual advantages from a kinematic perspective: The entire rear-wheel system is literally made lighter by removing the exposed and often vulnerable drivetrain components. “This reduces what’s known as unsprung mass, improves the responsiveness of the suspension components, and consequently also improves traction,” Bischoff explains.

A Rigorous Test for Component Development

The extreme load peaks in downhill racing serve as the ultimate endurance test for the industry. As Elmar Keineke of Universal Transmissions, the exclusive German distributor for Gates, emphasizes, the success was largely due to the close collaboration between engineers, mechanics, and the Swiss frame manufacturer Gamux during system integration. The athlete also benefited significantly: After the race, Harnden particularly highlighted the smooth and reliable performance, which, according to Keineke, allowed her to “focus completely on the race.”

The insights gained on the racetrack are now being directly incorporated into the further development of production components—particularly in terms of durability, power transmission, and responsiveness. According to Keineke, this real-world test “opens up further possibilities for use in various bicycle segments and, beyond that, in micromobility.”

Thanks to this performance record, the “Belt-Bikes”’ image as a niche product should soon be a thing of the past. Industry expert Bischoff also believes it’s possible that the International Cycling Union (UCI) will use this latest milestone as an opportunity to officially allow belt drives in BMX and track cycling in the future.

Chain vs. Belt: A Technical Comparison

What does the switch from a chain to a belt mean for design and operation? Here’s an overview of the key differences between the two systems:

Frame Design & Tolerances: Since belts, unlike chains, cannot be split, they absolutely require a frame lock in the rear triangle (or special pulley systems on full-suspension bikes). In addition, designers must incorporate high frame stiffness and a belt-tensioning mechanism (horizontal dropouts or an eccentric bottom bracket).
Wear & Stretch: Standard chains wear out at the pivot pins and stretch, which damages the entire system (sprockets, chainrings). Embedded carbon tension strands completely prevent the belt from stretching—performance remains consistent.
Maintenance & Winter Use: Belts are resistant to rust, road salt, and temperatures as low as -20 °C (−4 °F). Maintenance is limited to rinsing with water and occasional tension checks (which can be measured via the app). Chains, on the other hand—especially in winter—require constant cleaning and lubrication.
Service Life & TCO (Total Cost of Ownership): Under comparable conditions, a belt lasts about 2.5 to 3 times longer than a chain (up to 30,000 km/ 18,641 miles). Despite higher initial costs for special frames and pulleys, the belt is often the more economical solution in the long run.
Efficiency & Performance: A clean, well-lubricated derailleur system continues to offer the best efficiency. However, the belt catches up at high torque (watts) and scores points because its efficiency remains consistently constant due to the absence of elongation.
Reliability & Durability: Sudden belt breaks are virtually impossible when the tension is correct and the belt is perfectly aligned. However, due to their design, the carbon strands are more sensitive to hard side impacts (such as from rocks or branches) than a steel chain.
Spare Parts Availability: Chains are a global standard and available everywhere. Belts are still considered a rarity worldwide, but they are easier to carry in your luggage than replacement chains.

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