Page 7 - 2016-v.1-Part 9(EN)

TBIS 4210-9:2016

Cycles — Safety requirements for bicycles —

Part 9:

Saddles and seat-post test methods

1 Scope

This part of TBIS 4210 specifies saddle and seat-post 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 4210-1:2016, Cycles — Safety requirements for bicycles — Part 1: Terms and definitions

TBIS 4210-2:2016, Cycles — Safety requirements for bicycles — Part 2: Requirements for city and
trekking, young adult, mountain and racing bicycles

TBIS 4210-3:2016, 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 Test methods

4.1 General

If a suspension seat-post is involved, the test may be conducted with the suspension system either free
to operate or locked. If it is locked, the pillar shall be at its maximum length.

4.2 Saddle/seat-post — Security test

With the seat-post correctly assembled to the bicycle frame at minimum insertion depth of the seat-post
(as specified in TBIS 4210-2:2016, 4.16.2), and the clamps tightened to the torque recommended by
the bicycle manufacturer total three times, apply a force of F 1 vertically downwards at a point 25 mm
from either the front or rear of the saddle, whichever produces the greater torque on the saddle
clamp. The saddle shall be positioned in the seat-post clamp assembly as defined by the saddle
manufacturer’s rail markings or instructions. Maintain this force for 1 min. Remove this force and
apply a lateral force of F 2 horizontally at a point 25 mm from either the front or rear of the saddle and
maintain this force for 1 min, whichever produces the greater torque on the clamp (see Figure 1). The
forces are given in Ta ble 1. The fixture shall be such that it does not damage the surface of the saddle.

1