Page 9 - 20190101 part 6 (EN)

TBIS 4210-6:2019

Cycles — Safety requirements for bicycles —

Part 6:

Frame and fork test methods

1 Scope

This part of TBIS 4210 specifies the frame and fork test methods for TBIS 4210-2.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.

TBIS 4210-1, Cycles — Safety requirements for bicycles — Part 1: Terms and definitions

TBIS 4210-2, Cycles — Safety requirements for bicycles — Part 2: Requirements for city and trekking,
young adult, mountain and racing bicycles

TBIS 4210-3, Cycles — Safety requirements for bicycles — Part 3: Common test methods

3 Terms and definitions

For the purposes of this document, the terms and definitions given in TBIS 4210-1 apply.

4 Frame test methods

4.1 Frame — Impact test (falling mass)

4.1.1 General

Manufacturers of frames are permitted to conduct the test with a dummy fork (see Annex A) 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 80 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.
4.1.2 Test method
4.1.2.1 Stage 1 Frame— Impact test (falling mass)

Assemble a roller of mass less than or equal to 1 kg and with dimensions conforming to those shown in
Figure 1 in the fork. The hardness of roller shall be not less than 60 HRC at impact surface. If a dummy
fork is used in place of a fork, the bar shall have a rounded end equivalent in shape to the roller. Hold the
frame-fork or frame-bar assembly vertically with clamping to a rigid fixture by the rear-axle attachment
points as shown in Figure 1.
1