The Willys Wheeler comes with standard 17" rims (sport has 16" rims standard), rock rails (sport has none), mud tires (sport has road tires), heavy duty springs (sport has regular springs), gas shocks (sport has standard shocks), 3:73 gear ratio (sport has 3:21 ratio), Trac-Lok rear differential (sport has no trac-lok), black rims (sport has plain steel rims). The Willys Wheeler has a higher ground clearance and approach/departure angles than the sport. I think the Willys Wheeler front axle is an upgrade over the sport. The Willys Wheeler has mud mats (the sport does not).The Willys Wheeler also comes with an offroad recovery package that includes a tow strap, two shackles, winch gloves, and a storage bag with JEEP logo. The wheel/tire package and suspension package for the Willys Wheeler is based off the Rubicon. The main differences on the Rubicon is the swaybar disconnect and a front/rear Dana 44 differential with both differentials having 4:10 gear ratio. Otherwise, the Willys Wheeler is more prepared for offroad than the sport, but not as offroad ready as the Rubicon,...and you can't beat the price on a Willys Wheeler for it being a very capable sport upgrade. All that and black grille upgrades, black appliques on the front and rear bumpers, some cool decals, grab handles for the roll cage, and JEEP easter eggs on the rims, windshield, etc. I just bought a 2015 Willys Wheeler last week. The wife loves it too.