At least three AMA Buell Pro Thunder races will run in conjunction with WERA National Challenge Series events in 2001. Three rounds of the Pro Thunder Series were dropped from the AMA Pro Series to accomodate double-header Superbike races, at Road Atlanta, Road America and Mid-Ohio. Those events will be replaced with Pro Thunder rounds at WERA National Challenge Series races at Portland July 1, Summit Point August 5 and Road Atlanta October 28. A fourth round of the AMA Buell Pro Thunder Series may also be moved to a WERA race. The normal Pro Thunder purse will be paid at the rounds run in conjunction with the WERA races. The move is the first result of a new AMA and WERA cooperative affiliation. If it is successful, entire AMA Series could be moved to WERA events. Observers say it may be noteworthy that WERA has limited its Formula Two class at National Challenge Series events to 250cc Grand Prix machines starting in 2001, possibly setting the stage for the entire AMA 250cc Grand Prix Series to be run in conjunction with the WERA National Challenge Series some time in the future.