I broke one of the original front hubs and c hubs, i dont use the limiting screws either. I beleive if you crash, no matter how hard eventually something will break. Also i think the type of track and markings can effect how severe a crash is needed to break things. E.g my track.is a tight indoor track with rope markings, although they move when hit them they drag the cars in if they get clipped which i believe is what broke mine. I love my h4 and really believe its as quick if not quicker round a track than my trf417v5 was. Only quibble i have with the car ia the front driveshafts breaking but when my tamiya dcjs arrive im hoping this will be solved