Page 17 - 20190101 part 7 (EN)

ISO 4210-7:2019

Annex C
(normative)

Wheel assembly for mountain bicycle – Energy absorption test

C.1 General
1. The test method of the item is applicable to wheel assembly for mountain bicycle which
defined in TBIS 4210.
2. The tyre should be inflated to the minimum inflation pressure

C1.1 Requirement:

When tested by the method described in C1.2, there should be no fracture or visible cracks, no loss of
air pressure in the tyre, and the run-out shall not exceed the values which are given in TBIS 4210-2
Table 7.

C1.2 Test methods:

The wheel set is supported by the axle fastening device, and the impact position is 90 degrees relative to
the air nozzle, and then impacted at 40 J (the drop height is calculated from the edge of the rim). The
impact cone anvil needs to be iron-based metal with a total mass (including cone anvil) of 22.5 kg. It is
allowed to be guided during the fall, and it is necessary to reach the falling speed of 95% or more of the
free fall. The geometry of the cone anvil is shown in Figure C.1, and its length must be greater than the
width of the tyre.

Figure. C.1 Wheel assembly for mountain bicycle – Energy absorption test

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