Roost is just the dirt, gravel, debris etc. getting kicked up and thrown by the tires of the rider in front of you. If you ride alone, or just do casual trail riding you probably don't need to worry about it, but when riding competitively, you'd be surprised at how much damage it can do. My brother had a bruise on his chest from a rock my rear tires whipped at him, and has little nicks all over the front of his plastics, bumper, headlight, and a-arms just from little stuff getting kicked at him.
For more info click here lol:
http://yfm350.proboards31.com/index.cgi?action=display&board=pictures&thread=1165728725&page=1
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