DengFu E56 Fat E-bike carbon frame fatigue test with a vertical force shall be maintained as specified in ISO 4210 mountain bicycles standard.

Test method

Stage 1

Mount the frame in its normal attitude and secured at the rear dropouts so that is not restrained in a rotary sense (i.e. preferably by the rear axle) as shown in Figure 1. Fit a suitable roller to the front axle in order to permit the frame to flex in a fore/aft sense under the test forces.

Insert intended seat post at minimum insertion depth or equivalent to a seat stem to a depth of 75 mm in the top of the seat tube and secure this to the manufacturer’s instructions by the normal clamp. Securely attach a horizontal, rearward extension (E in Figure 1) to the top of this bar such that its length (dimension h3 in Figure 1) places point H in a position equivalent to that of the centre of the saddle clamp with the bicycle at its maximum saddle height recommended for the particular frame, or, if the maximum saddle height information is not available, dimension h3 shall be 250 mm.

Apply cycles of dynamic, vertically‐downward forces of stage 1 F4 at a point 70 mm behind the intersection of the axes of the solid steel bar and the extension piece, E, as shown in Figure 1 for 60 000 test cycles. The forces are given in Table 1. The maximum test frequency shall be maintained as specified in ISO 4210.

If the frame meets the requirement as specified in ISO 4210, and conduct stage 2 of the test with the assembly in the same mountings.

Stage 2

With the frame and f ront  fork  assembly  mounted  as in the previous paragraph, Apply cycles of dynamic, vertically‐downward forces of stage 2 F4 at a point 70 mm behind the intersection of the axes of the solid steel bar and the extension piece, E, as shown in Figure 1 for 50 000 test cycles. The forces are given in Table 1. The maximum test frequency shall be maintained as specified in ISO 4210.

DengFu E56 Fat E-bike carbon frame horizontal fatigue test report.

DengFu E56 Fat E-bike carbon frame vertical fatigue test increase by 30% according to ISO 4210 standard requirements in the actual test.