Yesterday I bumped my left wheel on a pavement, due to an understeering after accelerating (my bad). I smashed it quite good and I was certain the alignment was off, so I did some tests. No tire squeeking on turns, no high speed vibration, although I noticed the car goes just a little to the left when driving straight. But the most intriguing thing is the fact, when I steer **a little** (about 2-3cm) from the straight position of the wheel, at low speeds (like 20-40km/h) I can feel a broad and heavy oscillation in my hands, about 1-3hz? I play with the wheel when going straight, tilting it a bit to the left and right, and always feel this oscillation. This behaviour seems to stop over 70-80km/h. What could this be?