BIAS REGULATED ROLLING TRUCK BED COVER

A tonneau system that includes a tonneau cover and a canister. The canister includes one or more tracks for guiding the tonneau cover within the canister during movement of the tonneau cover relative to the canister; and a retraction system including: a drive roller; one or more drive gears; and a bias member that moves the drive roller and the one or more gears to assist in moving the tonneau cover relative to the canister.