i couldnt even imagine using my spare ball fo strikes.. i just got a new one about two months ago and its so polished, theres like zero friction. i cover alot of lane with my strike ball, but i can crank my spare ball and id be lucky if it moved 2 boards. to use this spare ball as my first shot ball, id have to drop to like 13mph and throw it on the wood floor in my home to get it to hook. even my wood floor at home is too slick to get it to hook. good shooting!