the other day i was watching motorcycle racing from daytona. ya know, the ones where they are going 200 MPH and dragging their shoulder in the turns. pretty exciting stuff. they were good. there is no way i would have the guts to ride that hard. anyway, when they pit, they can change the rear tire so fast you think it is magic. they have the axle, the rear brake assembly, and the chain to fool with..... and lord knows what else. i tried to figure out how, but they were too fast and the camera guy wasn't cooperating. how in the dickens do they change the rear tire so fast? BTW, the announcer said it was a rule that the rear sprocket has to be changed with the wheel. the same sprocket cannot remain with the bike and be used with every rear wheel. well my wife wanted to change channels before i could figure it out. so i'm clueless how they do it. does anyone have any insight?