i have a friend who got some eagle alloys so i test fit them but the hole for the hub seemed to be to big. there was a gap larger that on the stock wheels. he also doesnt know the size all i know is there are 33x12.50x15r tires on them now. i am going to get 31x10.50x15r and dont know how to measure the backspacing or width of the eagle rims. is there anyway to find it out.

 

Backspacing is measured from the mounting surface of the wheel to it's rear lip. The width is measured from the inside of the bead to the inside of the other bead.