CHEVY CHASE, Md., Sept. 18, 2007 â?? The â??GEICO Chopperâ?? â?? built by nationally-known motorcycle builder Rick â??Big Rickâ?? Hoffman and which is now on tour across the country â?? will be auctioned off online to benefit a number of childrenâ??s charities Oct. 22 â?? Nov. 1.