Page 152 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019
Annex H

(informative)
Wheel/tyre assembly - Fatigue test

H.1 Requirements

When tested by the method described in H 2, there should be no
fractures, detachments or visible cracks in any part of the wheel, no loss
of air pressure in the tyre due to damage from the wheel to the tyre or
the inner tube (where fitted), and the undamaged tyre should remain on
the rim. When measured by the method described in 4.3.9.1 the racing
bicycle run-out shall not exceed 1 mm and the other type bicycle shall not
exceed 1 .2mm.

H.2 Test method

Assemble the wheel, tyre and inner tube (when fitted) and inflate the tyre
to 90 % of the maximum pressure, which is moulded on the side wall of

the tyre.
Mount the wheel/tyre assembly free to rotate on its axle, and free to

move in vertical direction. Load the wheel assembly by means of dead
weights against a drum equipped with equally spaced, transverse,
metallic slats such that the radial force applied to the wheel/tyre

assembly is 640 N. The wheel and drum axes shall be vertically aligned.
An example of a test arrangement is shown in Figure I.1, in which the

wheel axle is fixed between the free ends of a pair of pivoted arms that
extend horizontally with the tyre contacting the drum between the slats.

The diameter of the drum shall be in the range 500 mm to 1 000 mm, and
the slats shall have a width of 50 mm ± 2,5 mm, a thickness of 10 mm ±
0,25 mm, and shall have 45° chamfered edges of half their thickness. The

circumferential spacing between the centrelines of two consecutive slats
shall be not less than 400 mm.

Rotate the drum to give a linear surface speed of 25 km/h (±10 %) for a
period to provide 750 000 impacts between the tyre and the slats.

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