I'm running a 15x8 rim 41/2 b/s with 255 r60's moved my springs in 3/4", The 83/4 i put in is 7/8ths narrower then the 71/4 i took out.They are tight but i can get my hand between the outer tire and wheel lip. http://www.forabodiesonly.com/mopar/showthread.php?t=246733