Page 14 - 2016-v.1-Part 8(EN)

TBIS 4210-8:2016

4.6.3 Test method with the cranks at 30° to the horizontal for mountain bicycles

Mount the assembly of the two pedal-spindle adaptors, the drive side and non-drive side crank, the chain
wheel set (or other drive component), and the bottom-bracket spindle located on its normal-production
bearings in a fixture with bearing housings representative of the bottom-bracket, as shown in Figure 7.
Incline the cranks at 30° to the horizontal as shown in Figure 7. Restrain the non-drive side crank to
the base of the test machine by a device attached to the pedal-spindle at a distance of 65 mm from the
outboard face of the crank.

4.6.3.1 Stage 1
Apply a repeated, vertically downward, dynamic force of 1 800 N to the pedal-spindle of the drive side
crank at a distance of 65 mm from the outboard face of the crank (as shown in Figure 7) for 60 000 cycles.
The maximum test frequency shall be maintained as specified in TBIS 4210-3:2016, 4.5.

4.6.3.2 Stage 2
Apply a repeated, vertically downward, dynamic force of 1 900 N to the pedal-spindle of the drive side
crank at a distance of 65 mm from the outboard face of the crank (as shown in Figure 7) for 50 000 cycles.
The maximum test frequency shall be maintained as specified in TBIS 4210-3:2016, 4.5.

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