Perfect Condition Used 2021 Harley-Davidson Vivid Black Street Glide FLHXS For Sale! The look is backed up by the refined power of a Milwaukee-Eight 107 engine and high-performance suspension for an unmatched ride. The optional RDRS Safety Enhancements is a collection of technologies designed to enhance rider confidence during unexpected situations or poor road conditions.. The systems utilize advanced chassis control, electronic brake control and powertrain technology to assist you with accelerating and braking in a straight line or while in a turn. The original stripped-down hot rod bagger. Come see it for yourself before it's gone! Give it a test ride while you're here!