The mid-size 2007 Nissan Frontier pickup comes in two cab styles, King Cab and Crew Cab. The King Cab has smaller, rear-hinged rear doors, and the Crew Cab has full-size, front-hinged rear doors and a larger rear-seat area. The King Cab is available in a single bed length, but the Crew Cab is now available in standard bed and long bed versions; the new long bed is 13 inches longer. The Frontier shares its basic layout, including the suspension and other components, with the larger Titan pickup. The suspension combines a double-wishbone front setup with a solid-axle and leaf springs at the rear. Base Frontier King Cab 2WD trucks have a 152-horsepower, 2.5L four-cylinder engine. All other Frontiers are powered by a 4.0L V6 engine, making 261 horsepower and 281 lb-ft of torque. The predominantly aluminum, double-overhead-cam engine has continuously variable valve timing, variable induction, and a number of attributes for smooth operation and efficiency. Four-cylinder models have a five-speed manual transmission standard, while V6 models get six speeds. A five-speed automatic is available on both. On V6 models, a four-wheel drive system is available, featuring electronically controlled shift-on-the-fly engagement and a low range. The 4WD models also bring a four-wheel limited-slip system. Hill Descent Control (HDC) helps maintain a steady slow speed while descending especially steep slopes, while Hill Start Assist (HAS) allows a smooth, controlled start on a steep incline without roll-back; both features are optional. There's also an off-road Nismo edition, available in King Cab or Crew Cab versions with either 2WD or 4WD, which brings Bilstein performance shocks and an electronic-locking rear differential. Ground clearance is increased, with vital hardware tucked within the frame rails. The Nismo also includes skid plates and 16-inch off-road tires. The Frontier has several innovative storage options, including storage boxes under the rear seats, a large center console, a dual-compartment glove box, and several power points. The Utili-track system, which brings removable utility tie-down cleats and secure attaching channels, is available and especially useful for securing heavy cargo that doesn't take up the entire bed. Front-seat side air bags are optional, as are side-curtain air bags that cover front and rear occupants.