Page 28 - TBIS_79010-2019_(EN)_1nd
P. 28
TBIS 79010:2019
4.2.2.11 Back-pedal brake linearity test
This test shall be conducted on a fully assembled CARGO BIKE. The output force for a
back-pedal brake shall be measured tangentially to the circumference of the rear
tyre, when the wheel is rotated in the direction of forward movement, while a force
of between 90 N and 300 N is being applied to the pedal at right angles to the crank
and in the direction of braking.
The braking force reading shall be taken during a steady pull and after one revolution
of the wheel. A minimum of five results, each at a different pedal force level, shall be
taken. Each result shall be the average of three individual readings at the same load
level.
The results shall be plotted on a graph, showing the line of best fit and the ± 20 %
limit lines obtained by the method of least squares outlined in Annex A.
Page 24 for 43
