Page 25 - 2017-v.2-Part 4(EN)

4.6.3.10 Validity of test runs

a) A test run shall be considered invalid if

1) excessive side-skid causing the rider to put his foot to the ground to retain control occurs, or

2) loss of control occurs.

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 1) or 2) above do not occur
as a result.

b) If the corrected braking distance exceeds the braking distance specified in TBIS 4210-2:2017, Table
2, a test run shall be considered invalid if the velocity at the commencement of the test exceeds
the specified test velocity by more than 1,5 km/h as specified in TBIS 4210-2:2017, Table 2.

c) If the corrected braking distance is less than the braking distance specified in TBIS 4210-
2:2017, Table 2, a test run shall be considered invalid if the velocity at the commencement of braking
is more than 1,5 km/h below the specified test velocity.

If the corrected braking distance exceeds the braking distance specified in TBIS 4210-2:2017, Table
2,
the test run shall be considered valid.

4.6.3.11 Test results

a) Braking under dry conditions

Depending on the gradient of the test track, the test result shall be the average value of the corrected
braking distance (see 4.6.3.9) of the test results of either 4.6.3.8 item a) 1) or 4.6.3.8 item b) 1).

For compliance with the requirements of TBIS 4210-2:2017, 4.6.8.1.1 the above average values
shall not exceed the relevant braking distances specified in TBIS 4210-2:2017, Table 2.

b) Braking under wet conditions

Depending on the gradient of the test track, the test result shall be the average value of the corrected
braking distances (see 4.6.3.9) of the test results of either 4.6.3.8 item a) 3) or 4.6.3.8 item b) 3).

For compliance with the requirements of TBIS 4210-2:2017, 4.6.8.1.1, the above average values
shall not exceed the relevant braking distances specified in TBIS 4210-2:2017, Table 2.

c) Ratio between wet and dry braking performance for city and trekking, young adult, mountain and
disc brake racing bicycles.

Because the wet and dry braking distances are measured at different test velocities, a simple
comparison of braking distances is not meaningful. Therefore, a comparison shall be made of
equivalent, calculated values, using Formula (2):
2
2 25
16 : (2)
S c W S D
where c

S c D is the corrected braking distance in dry conditions (m);

S c W is the corrected braking distance in wet conditions (m).

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