stock rims on a lifted cart

Just started building the lift for my 2002 ezgo 36v. I started with the front axle. Dropped them 4 " and adding width. Im trying to do this super cheap so i was planning on purchasing used tires for my stock wheels.
Anyone here running a lift with stock rims? Im curious if the offset causes a problem.
For those running a 6" lift, how much wider is the aftermarket axle?