Shifting Gears works the metric transition between 16th-note and triplet diddle figures. The tendency will be to either be fast or tight going into the triplet figures, and to be slow or wide going into the 16th-note figures. Such metric transitions are worth practising, not because they appear often, but because they demand a mastery of fulcrum pressure, wrist control, and diddle placement that will make more common diddle contexts (e.g. cold attacks, tap-rolls) more easy to reliably execute.