E-Bike Century: Battery Range for 100-Mile Rides Tested

A recent real-world test explored whether an e-bike can complete a 100-mile ride, also known as a century. The test, conducted during a fast-paced event on rolling roads, affirmed that a modern e-bike with adequate battery capacity can indeed cover such a distance while still offering a substantial workout for the rider Source.

E-Bike Range Put to the Test

The test involved a Class 3 e-bike with a 28 mph assist cutoff, TQ's HPR40 drive unit, a 580Wh in-frame battery, and two 160Wh range extenders, providing a total of 900Wh of battery power. The rider completed a 103-mile course with varying terrain and wind conditions, ending with 42 percent of the main battery remaining.

While brand claims for e-bike range often exist, this test provided practical data derived from actual road conditions. It accounted for factors like rider effort, group dynamics, and environmental elements, which all influence battery consumption.

Battery Performance and Consumption

The e-bike used approximately 656.4Wh of power over the 103 miles, an average of about 6.4Wh per mile. This consumption rate suggests that the century could have been completed with the 580Wh main battery and a single 160Wh range extender (740Wh total) Source. This demonstrates that a well-equipped e-bike can offer significant endurance capabilities.

However, the article emphasizes that battery consumption is highly variable. Factors such as climbing, wind, speed, tire choice, rider weight, and time spent drafting or leading a group all impact the actual range. For instance, a stronger headwind experienced in the third lap significantly affected the energy expenditure, slowing lap times despite consistent effort.

The Impact of Assist Cutoff

The Class 3 e-bike's 28 mph assist cutoff played a crucial role in maintaining pace with groups moving above 20 mph. For faster rides, this higher cutoff ensures the motor can continuously support the rider through varied terrain, not just on slower climbs. A Class 1 bike with a 20 mph cutoff would alter dynamics and likely result in a slower overall pace for similar rides.

E-Bikes and Rider Effort

One common misconception is that e-bikes eliminate the need for rider effort. The test clearly refuted this, showing that the rider achieved a normalized power of 208 watts, accumulated 353 TSS (Training Stress Score), and burned an estimated 3,270 calories over the ride. The average heart rate was 149 bpm, reaching a maximum of 173 bpm.

This indicates that e-bikes modify the riding experience, allowing riders to maintain higher speeds and cover distances more efficiently, but they do not negate the physical demands of cycling. The motor assistance, set to deliver up to 125 watts in Eco mode, enabled the rider to sustain speed and reduce fatigue, particularly on climbs and against headwinds.

The author estimated that riding the same distance on an unassisted bike with similar rider-side effort would have taken 45 to 55 minutes longer. This highlights the e-bike's role in extending distance and speed capabilities without removing the workout aspect.

Aero Efficiency: A Factor in E-Bike Range

The article also touched upon the importance of aerodynamics. Even on an e-bike, aero considerations like wheel depth and clothing choice can impact battery consumption. Every watt saved by reducing air resistance is a watt that the motor doesn't need to supply, directly extending battery life.

Planning for E-Bike Endurance

For businesses and operators, this test provides valuable insights into e-bike performance over long distances.

• Battery Capacity: For 100-mile routes, adequate total Wh capacity, potentially including range extenders, is essential. The ability to swap or recharge range extenders at aid stations can be a strategic advantage.
• Terrain and Weather: Flat routes consume less power than hilly ones. Wind, especially headwinds, can significantly increase battery drain. Route planning must account for these variables.
• Assist Levels: Customizable assist modes allow for optimization based on rider preferences and desired exertion levels, affecting overall range.
• Rider Engagement: Emphasize that e-bikes still require rider input, ensuring that users understand they will get a workout while benefiting from the assist.

This real-world assessment provides a more nuanced understanding of e-bike capabilities, moving beyond theoretical range claims to practical application in demanding riding scenarios.