A flat spot is what you get when you lock up the rear brake allowing the pavement to grind the tire down in one spot. This is usually done as an act of sheer panic by inexperienced riders trying to avoid what they feel is certain death.
Wearing down the center of the tire while leaving the outsides like new is often referred to the Chicken Strip. This also is much more common amongst inexperienced riders who lack the ability to actually lean their bikes, except to put it on the side stand.
__________________ “Please Remember to Kazoo Responsibly.” 
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