Getting ready to upgrade wheels and trying to find out what the backspacing is now on my stock wheels. I have the green keys and a 1" crank on the front and a 2" block in the rear. I want to go with 18"x9" with similiar tucked look that the HD'S come with std. Tire size will be equivalant to 34-1/2" x 12.5"x18". Truck sits really rall right now. Thanks for your help.

 

most stock wheels are 4 or 4.5" off back spacing which is touching the hub. If you are shopping for wheels, and are concerned about how they will sit under the vehicle just follow this...

The lower the number on the back spacing the further they will stick out, and vice versa.

 

I know they are only 6.5 inches wide, so I wouldn't think it would be much more than 4"-4.5"

 

If I remember correctly they are 5.00" BS. I just bought some H2 rims and tires and they have a 5.50" BS. They will fit, I am just not sure about the tires.