def hit something. my guess is a mechanics lift maybe... I did the exact same thing first week I put my yoko's on, just like that... just bumped a lift leg with it, the lift leg just popped out of the way, didn't think much of it till few days later I seen the gash.... very similar to that one too...
Maybe a loose piece of metal on the road you did not see ..
It this on your front or rear tire?
That bitez. At least it wasnt your rim