Page 27 - 2018-v.3-Part 2(EN)

4.10.4.2 Wheel retention — Retention devices secured

When tested by the method described in TBIS 4210-7:2017, 4.3, there shall be no relative motion between
the axle and the front fork/frame.

4.10.4.3 Front wheel retention — Retention devices unsecured

A bicycle shall be equipped with secondary retention system that retains the front wheel in the drop-
outs when the primary retention system is in the open (unlocked) position.

Where threaded axles and nuts are fitted, and the nuts are unscrewed by at least 360° from the finger
tight condition and the brake system is disconnected or released, the wheel shall not detach from
the front fork when a force of 100 N is applied radially outwards, in line with the drop-out slots, and
maintained for 1 min.

Where quick-release is fitted, and the quick-release lever is fully open and the brake system is
disconnected or released, the wheel shall not detach from the front fork when a force of 100 N is applied
to the wheel radially outwards, in line with the drop-out slots, and maintained for 1 min.

4.10.5 Wheels — Quick-release devices — Operating features

Any quick-release device shall have the following operating features:

a) it shall be adjustable to allow setting for tightness;

b) its form and marking shall clearly indicate whether the device is in the open or locked position;

c) if adjustable by a lever, the force required to close a properly set lever shall not exceed 200 N and, at
this closing force, there shall be no permanent deformation of the quick-release device;

d) the releasing force of the clamping device when closed shall not be less than 50 N;

e) if operated by a lever, the quick-release device shall withstand without fracture or permanent
deformation a closing force of not less than 250 N applied with the adjustment set to prevent closure
at this force;

f) the wheel retention with the quick-release device in the clamped position shall be in accordance
with 4.10.4.2;

g) the front wheel retention with the quick-release device in the open position shall be in accordance
with 4.10.4.3.

If applied to a lever, the forces specified in items c), d), and e) shall be applied 5 mm from the tip end of
the lever.

4.11 Rims, tyres, and tubes

4.11.1 General

Non-pneumatic tyres are excluded from the requirements of 4.11.2, 4.11.3, and 4.11.4.

NOTE For wheel/tyre assembly fatigue test for city and trekking bicycles, see TBIS 4210-7:2017, Annex
A.

4.11.2 Tyre inflation pressure

The maximum inflation pressure recommended by the manufacturer shall be permanently marked on
the side wall of the tyre so as to be readily visible when the latter is assembled on the wheel. If the

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