One of the homiest comfort foods, beef stew practically cooks itself as it slowly simmers on the stove. Beef for stew is boneless, pre-cut cubes, typically from the chuck or round. The ideal size for uniform cooking is about a 3/4 to 1-1/2 inch cube.
If you prefer to cut your own cubes, any chuck or round cut -except top round – may be used. Trim the excess fat and cut into the appropriate size for your recipe.
Source: www.beefitswhatsfordinner.com