It seems to be a flat spot,and the hump is what isnt a flat spot.
This is what the streets of south chicago and nortwest indiana does to bicycles after about 2500 miles.
If it done this to my rim,I could imagine what it would do to one of those expensive racing bikes.Or could those racing bikes with those thin tire hold up better?My rims are aluminum and use those 2.125 fat tires(absorb the shock?).