Page 38 - 20190101 part 6 (EN)

TBIS 4210-6:2019

E2: Stiffness measurement of the frame after the bottom brackets (BB) is
applied by pedalling force

Test method
The erection condition of the test sample and its force application position are the same with
those of TBIS 4210-6 :2017, Sec. 4.3; however, the included angle of the vehicle body and the
plumb line of the ground should be 10° during the application of the force (The rear shaft
and the base of ball joint shall tilts at the same time, the vehicle body tilts toward the left
side when the force is applied to the right side; the vehicle body tilts toward the right side
when the force is applied to the left side). Please vertically apply the force 800 N downward
for 1 minute; the force should be applied to the drive side first, and then applied to the non-
drive side; then, please measure the deformation of the deformations of the shaft fixture of
the pedal and the rear fork shaft under the force application condition. The unit for
recording the stiffness is N/mm.

F: Ux, Uy, Uz = 0, Rz = Free, Rx, Ry = 0
R: Rz = Free,
Ball: Rz, Rx, Ry = Free
Y axis : 10 degree

Figure E2- Stiffness measurement of the frame after the bottom brackets (BB) is applied by
pedalling force

E3: Stiffness measurement of the frame after the front fork is applied by
lateral force.

Test method
The rear shaft should be locked at the bearing base which can freely rotate axial-wise.
Please apply 300 N to the axial direction of the front fork for 1 minute, and measure the
deformation of the force application direction. The unit for recording the stiffness is
Nm/degree.

F

R: Rz = Free, Rx, Ry = 0, Ux, Uy, Uz = 0

Figure. E3- Stiffness measurement of the front fork is applied by lateral force.

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