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How we tested: Assistance Level and Mountain Range

A test like no other in the world with live test riders over two different routes and modern measuring instruments. Conducted by Frieder Herb and Kerstin Bünte, in Kirchheim/Teck, Germany.

The Procedure:

1. Preparation:

• Cycles: Charged with original Charger, discharged with an electronically controlled discharger.
• Measuring cable soldered in to measure the electricity flow during the test.

The following equipment was used with each bike:
• Handlebar bag with tools and an on-board computer for saving measurement data
• Palm-Computer for recording speed, pedaling rate, and pedaling power
• Special pedals to measure exact amount of Muscle power. The data is transferred via radio to the on-board computer
• Pedaling rate, and speed sensors
• Cyclosport Hack-4 for measuring pulse

Further steps:
• Pedal calibration through weight comparison
• Wiring attachment
• Tire pressure check
• Set wheel measurements into computer

2. Tests

Every-day use track
The 5 mi long route in Kirchheim/Teck has a short incline up to 8% and is otherwise flat.

Mountain route
The 1/3 mi long stretch begins with an 8 % incline and then decreases into a 7 % incline.

Determining the assistance level
• A comparison Test bike without electric assistance with similar components to the bike being tested was ridden.
Values for power, speed and pedal rate, were then determined from the data collected to be compared to the bikes with electric assistance. The test was then repeated three times at different average speeds.
From that, the theoretical values can be calculated to determine what rider performance is necessary to ride at any average speed.

• Test with every pedelec in the test.
Determining power, speed and pedaling rate from the data recorded. Calculating the average with the theoretical rider performance from the comparison bike with the same average speed. The necessary riders performance should normally be less than that of the comparison bike without electric assist. From the difference can be calculated to see what percent the electric motor assists the rider. That is, the assistance level in comparison to the bike without the electric assist.

Determining the mountain range
In the mountain track, the rider rode up hill until the battery was dead (down hill the rider coasted).

3. Evaluation
After each test was completed, the data; speed, power and pedaling rate, were downloaded from the palm computer to a PC, where it was evaluated.



7 - 12 September 2021, IAA, Munich, Testtrack

all events...