Page 39 - 20190101 part 6 (EN)

TBIS 4210-6:2019

E4: Stiffness measurement of the frame after the seat tube is applied by
down force.

Test method
The erection condition of the test sample and the force application position are the same
with those of TBIS 4210-6 : 2017, Sec. 4.3. It is necessary to provide a seat fixture to create a
vertical height difference of 750mm between the force application position distance BB
center and the seat. The position where the load is hung is sway from the rear side of the
center of the base bar by 70mm; please hang 100 kg at the position. The deformation
measurement point is away from the rear side of the center of the base bar by 85 mm; please
measure the deformation under the force application condition. The unit for recording the
stiffness is Nm/degree. F

R: Rz = Free, Rx, Ry = 0, Ux, Uy, Uz = 0
F: Rx, Ry = 0, Rz = Free, Ux = Free, Uy, Uz = 0
Figure E4- Stiffness measurement of the frame after the seat tube is applied by down force

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