Spare wheel specs?

[HLewallen]

Just curious - Does anyone know the width and backspacing of the factory steel spare wheel? Are they rated for the same use as an actual wheel (as in temproary use only)? I have a 35" tire mounted to my factory spare wheel, and I was thinking about picking up another one since I have a second 35" spare tire available. With the tire mounted I can only make some crude measurements, but it seems close to the 8"wide 6" back space . . .

 

[nickleinonen]

the factory spare is 17x7. 5" [it is stamped right on the wheel if you look for it]. i think the backspacing is 6" like the rest of the wheels. they are the same wheels that come on a base model st truck, but painted black not silver, so the weight ratings should be similar to the rest of the dodge wheels