sentences:  Similar to skateboarding in certain respects, 'biting' is a common hindrance during grinding whereby friction between the wheel(s) and surface it comes into contact causes the wheel(s) then entire boot to suddenly reach a halt and the momentum throws the aggressive inline skater off the rail or ledge.Again, the aspect of wheel profile is key here.A harder wheel on a flat setup will slide and 'bite' less than a softer wheel.