What kind of fork could i fit on my bike What's the max amount of travel you guys think i could install on this kind of frame geometry? I have the same bike as the image. It comes with a suntour 100mm fork and a really stiff rear shock coil. The bike is designed for XC, but i would like to hit some bigger jumps on it. Aluminium frame. The bike model is Berg Trailrock 100x
I wouldn't consider anything over 140mm. beyond that, you're really messing up your geometry and endangering your frame.

Keep in mind that your frame's limits are really determined by how much you weigh. If you're 140 pounds, the frame will take much bigger jumps than if you're 240.

You say that the rear shock is really stiff. It seems there is an imbalance in stiffness between the front and rear suspensions. If you don't have the preload on your Suntour cranked all the way up, you should try doing so before upgrading.