The test scenario required the testing rider to carry out multiple braking procedures on each of the test bicycles, both on a surface with a high adhesion co-efficient (dry) and on a surface with a reduced ad-hesion coefficient (wet). All the braking procedures were initiated at a speed of 25 km/h with the maximum deceleration possible, by an experienced test rider. For the wet-surface braking procedures, large quantities of water were applied to the entire run-up and travel surface, the braking area, and the test bi-cycles and their braking systems. The measurements were taken using a tape measure, and the measuring point was the axle of the front wheel. The tests produced the following results:
The disc brakes demonstrated good modulation overall. On the dry surface, all the test bicycles demonstrated appropriate braking power; there was no significant drop-off in any of the braking systems. The longest braking distance on the dry surface was recorded by the bicycle with the caliper brake at the front and the coaster brake at the rear. The mean braking distance for this bicycle was 4.55 meters. The speed pedelec recorded the shortest mean braking distance on the dry surface, with 3.66 me-ters. The difference between the shortest and longest mean braking distances on the dry surface was thus 89 centimeters.
On the wet surface, however, the differences were much more stark: In this scenario, the braking distance increased by over 20 percent for all of the test bicycles except the pedelec with ABS. The biggest difference was recorded for the test bicycles with caliper brakes at the front and rear. The braking distance for these bicycles increased by almost 30 percent on the wet surface. Overall, the ABS brake on the pedelec demonstrated the best performance on the wet surface, recording a braking distance that was only just under ten percent longer than its braking distance on the dry surface. On the wet surface, the longest braking distance was again recorded by the bicycle with the caliper brake at the front and the coaster brake at the rear. The mean braking distance for this bicycle was 5.53 meters. The pedelec with ABS recorded the shortest mean braking distance on the wet surface, with 4.15 me-ters. The difference between the shortest and longest braking distances on the wet surface was 1.38 meters.
Deceleration values of between 5.3 and 6.6 m/s² were achieved during the braking procedures conducted in dry conditions, while the deceleration values in wet conditions were between 4.4 and 5.8 m/s². As such, all the bicycles achieved the min-imum deceleration for motor vehicles of 5.0 m/s2 in the dry braking test. One model even exceeded this value on the wet surface: The ABS bicycle achieved a mean fully developed deceleration of 5.8 m/s².