Rear tire size 2004 crossfire

Hello, the proper tire size is listed on the tire placard inside the drivers door - on the door or the door jamb. However, you can find the size online; I tried a tire retailer and found that the proper size should be: FRONT: 225 - 40 - R18 REAR: 255 - 35 - R19 The speed rating isn't necessarily listed, but I'd guess it's Z factory equipped, and more like W or Y now. Good luck.