Wheels are anthracite Borbets from tire rack. +40 offset, 4X114.3, 17 x 7. Tires are Sumitomo's, I forget which model, but they were one of the highest rated on tirerack from their own comparison test. Very sticky compared to stock and quiet. Tire size is 215/45R17. During install I looked at all the suspension members and I could easily go to 225/45R17 and have no problems with clearance. Took the wheels and tires to a local Big-O tire and they charged me $10 per wheel to remove the TPSM sensors from the OEM wheels and mount and balance the new wheels with the TPSM's. Pretty good deal for $40, considering all the labor involved.
Total package price for wheels and tires including shipping from TireRack was a very affordable $1050. Much better than the rip-off price from the dealer for their gunmetal 16". I installed the side rocker panel myself. Bought the OEM part for $300 shipped on ebay. Dealer wanted $400 to install, because it involves drilling 7 holes into the lower sheetmetal per side, however if you follow the instructions and take your time is it pretty easy. Just a bit nerve racking at first because your drilling into the metal.
The Cube handles Way better with the wider tires and better compound. Only bad thing is it reduced fuel economy by about 4mpg both city and highway. The OEM tires are for fuel economy but handling is pretty miserable. Max fuel economy on the highway is 28-29mpg now.