$55k in purse money up for grabs in the Larry Miller Superbike Challenge May 29-31. Registration closing soon. (Tooele, Ut) The last official day to enter the Larry Miller Superbike Challenge is May 17, 2009. With $55k in purse money up for grabs and a strong roster of racers, the racetrack battles are sure to be fierce. Superbike Challenge is a two-race support series run the weekend of the HANNspree FIM Superbike World Championship at Miller Motorsports Park May 29-31. For registration information visit: ~http://www.superbikechallenge.com~