Maze and reading comprehension rate measures are calculated by using measures of reading speed and measures of accuracy (i.e., correctly selected words or answers). In sixth- and seventh-grade samples, we found that the measures of reading speed embedded within our Maze measures accounted for 50% and 39% of broad reading score (BRS) variance, respectively. Combining reading speed with Maze accuracy to form Maze rate increased explained BRS variance by less than 2%. For our comprehension measures, reading speed accounted for 22% and 36% of BRS variance, which increased significantly to 49% and 44% when our reading comprehension rate measures were added to our models. Discussion focuses on the relationships between the measure of aloud reading speed embedded within many brief reading rate measures and the validity and sensitivity of these measures. (Contains 5 tables.)