Measuring in with a 6 inch (152 mm) wide hangar and a 8.78 inch axle, the Tracker Sixtrack with our classic Gnarly or Dart baseplate is built with 8 1/4 to 9 1/2 inch wide decks in mind. Tracker uses 356 T6 aircraft grade aluminum, 4140 chromoly steel axles and grade 8 kingpins on all of our trucks. Every part was proudly hand built and inspected in the USA and comes with a lifetime guarantee.