Sidecars [Mini Dart Technology] The Harley-Davidson® "Sidecars" are a tiny replica of a full size set of darts that feature replaceable flights & shafts. The "Sidecars" look and fly like a standard set of darts, measuring under 3 inches and weighing in at a mere 4 grams. Included with our Twin Shooter dart sets you will find these darts are fun on a board of any size.