A system for trimming a kite having first and second lines, first ends of which are secured to a first side to the kite. The system comprises a bar having a hollow interior and at least one spool secured at a first end of the bar such that second ends of the first and second lines are each secured to one of the spools. A winder is provided such that actuation of the winder rotates each spool. The first line extends from the kite to the first end of the bar and the second line extends from the kite to a second end of the bar and through the hollow interior of the bar to the first end of the bar.