Page 12 - 2018-v.3-Part 2(EN)

TBIS 4210-2:2018

4.4 Crack detection methods

Standardized methods should be used to emphasize the presence of cracks where visible cracks are
specified as criteria of failure in tests specified in this part of TBIS 4210.

NOTE For example, suitable dye-penetrant methods are specified in ISO 3452-1, ISO 3452-2, ISO 3452-3, and
ISO 3452-4. In addition, white paint or surface treatment can be used to aid in detection for composite materials.

4.5 Protrusions

This requirement is intended to address the hazards associated with the users of bicycles falling on
projections or rigid components (e.g. handlebars, levers) on a bicycle, possibly causing internal injury or
skin puncture.

Tubes and rigid components in the form of projections which constitute a puncture hazard to the rider
should be protected. The size and shape of the end protection has not been stipulated, but an adequate
shape shall be given to avoid puncturing of the body. Screw threads which constitute a puncture hazard
shall be limited to a protrusion length of one major diameter of the screw beyond the internally threaded
mating part.

NOTE Handlebar ends are covered by the paragraph in 4.7.2.

4.6 Brakes

4.6.1 Braking systems

A bicycle shall be equipped with at least two independently actuated braking systems. At least one shall
operate on the front wheel and one on the rear wheel. The braking systems shall operate without binding
and shall be capable of meeting the braking performance requirements of 4.6.8.

Brake blocks containing asbestos shall not be permitted.

There should be a warning before the end of the wear limit (pad, rim and rotor).

4.6.2 Hand-operated brakes

4.6.2.1 Brake lever position

The brake levers for front and rear brakes shall be positioned according to the legislation or custom and
practice of the country in which the bicycle is to be sold, and the bicycle manufacturer shall state in the
manufacturer’s instructions which levers operate the front and rear brakes [see also Clause 5 item b)].

4.6.2.2 Brake lever grip dimensions

a) The brake lever similar to type A or type B

The dimension, d, measured between the outer surfaces of the brake lever in the region intended for
contact with the rider’s fingers and the handlebar or any other covering present shall cover a distance of
not less than 40 mm as shown in Figure 2 a) and Figure 2 b) and conform to the following:

— on bicycles on which the minimum intended height of the saddle is 635 mm or more, d shall not
exceed 90 mm;

— on bicycles on which the minimum intended height of the saddle is less than 635 mm, d shall not
exceed 75 mm.

Conformance shall be established by the method detailed in TBIS 4210-4:2017, 4.1.1. The range
of adjustment on the brake lever should permit these dimensions to be obtained.

NOTE See Clause 5 item c) in relation to the minimum intended height of the saddle.

b) The brake lever similar to type C
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