Hongfu FM358 XC 120mm frame

[HardTail29]

Hi, my frame size is M (17.5)

Now I have another problem. When the rear suspension compresses, the brake rotor rubbing the pads. This also occurs when the bike leans into corners. I think it's a rear triangle stiffness issue. I contacted HongFu two months ago, and since then they've only asked for a photo of the brake mount on the frame.

In this video i push down my chest on saddle two times

Thanks! well seems like my theory was incorrect then, as others with M-sized frames have reported they do not have the problem with the linkage hardware bottoming out at 70% travel.

And yes, looking at your video, that looks like there is insufficient stiffness in the rear triangle.