Page 59 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019

4.3.7 Frames
4.3.7.1 Suspension-frames – Special requirements

The design shall be such that if the spring or damper fails, neither the tyre shall
contact any part of the frame nor the assembly carrying the rear wheel become
detached from the rest of the frame.

4.3.7.2 Frame – Impact test (falling mass)

4.3.7.2.1 Requirements

When tested by the method described in 4.3.7.2.3, there shall be no visible cracks or

fractures of the frame. The permanent deformation measured between the axes of
the wheel axles shall not exceed the following values:
a) 30 mm where a fork is fitted;

b) where a dummy fork is fitted in place of a fork, the values are given in Table 10.

NOTE See Annex E (normative) Dummy fork characteristics.

Table 10 — The values of permanent deformation

Fork type Real fork Dummy fork

Permanent
30 mm 10 mm
deformation

4.3.7.2.2 General

Manufacturers of frames are permitted to conduct the test with a dummy fork (see
Annex F) fitted in place of a front fork.

Where a frame is convertible for male and female riders by the removal of a bar, test

it with the bar removed.

Where a suspension fork is fitted, test the assembly with the fork extended to its
unloaded free length. Where a rear suspension system is incorporated in the frame,
secure the suspension in a position equivalent to that which would occur with an 90
kg rider seated on the bicycle(For young adult bicycles, secure the suspension in a

position equivalent to that which would occur with a 40 kg rider seated on the
bicycle). If the type of suspension system does not permit it to be locked, then
replace the spring/damper unit by a solid link of the appropriate size and with end
fittings similar to those of the spring/damper unit.

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