wide growth rings are preferable because they have a better ratio of spring growth to winter wood, but i have made good bows out of tight ringed wood. One major draw back to tight rings is the stability of the bow. With tight ringed wood you should attempt to make one of the thicker rings the back of your bow. When dealing with tight rings it is more important to carfully chase the ring and keep from making to many flaws on the back of the bow, because tighter rings are at higher risk of beaking.