Page 16 - 2018-v.3-Part 2(EN)

TBIS 4210-2:2018

Table 3 — Calculated braking performance value
Bicycle type Condition Brake in use Minimum brak-ing performance value, Bp N
City and trekking Dry Front only 340
bicycles Rear only 220
Wet Front only 264
Rear only 168
Young adult bicycles Dry Front only 204
Rear only 132
Wet Front only 159
Rear only 101
Mountain bicycles Dry Front only 425
Rear only 280
Wet Front only 264
Rear only 168
Racing bicycles Dry Front only 425
Rear only 260
Wet Front only 264
Rear only 168

4.6.8.2 Smooth, safe-stop characteristics

The bicycle shall show smooth, safe-stop characteristics with regard to the intended use of the bicycle
and the ability of the expected user of the bicycle.

a) For the track test, smooth, safe-stop characteristics are defined as stopping within the required
distances without occurrence of any of the following:

1) excessive juddering;

2) front wheel locking;

3) bicycle overturning (rear wheel lifting uncontrollably);

4) rider’s loss of control;

5) excessive side-skid causing the rider to put his foot to the ground to retain control.

With certain types of braking system, it might not be possible to avoid entirely some skidding of the
rear wheel during braking; this is considered acceptable provided that item 4) or item 5) above do
not occur as a result.

Back pedal brakes shall additionally comply with the linearity test of TBIS 4210-4:2017,
4.6.4.

b) For the machine test, smooth, safe-stop characteristics are defined by compliance with the
linearity requirements specified in TBIS 4210-4:2017, 4.6.5.3 and the simple track test described
in TBIS 4210-4:2017, 4.6.5.7 item h).

4.6.8.3 Ratio between wet and dry braking performance

For city and trekking, young adult, and mountain bicycles, and racing bicycle for disc brake in order to
ensure safety for both wet and dry braking, the ratio of braking performance wet/dry shall be greater
than 5:10

The methods for calculating this ratio are given in TBIS 4210-4:2017, 4.6.3.11 item c) for the track test
and in TBIS 4210-4:2017, 4.6.5.7 item g) for the machine test.

NOTE 4.6.8.3 is not applicable to none disc brake racing bicycles.

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