Hi Al, you want 4.75" backspacing, and you won't have any issues. 4.5" will get you by but you "may" have a minimal amount of rubbing during un-even compression (like pulling in to a gas station at an angle). You can always trim the insides of the wheel lip. 5" of back-space gets your tires rubbing on the leaf springs. Hope this helps. Todd MN -----Original Message----- From: amx401spd@xxxxxxxxxxxx [mailto:amx401spd@xxxxxxxxxxxx] Sent: Sunday, April 17, 2005 7:42 PM To: mail@xxxxxxxxxxxx Subject: Wheel & tire sizes with back spacing Was wondering what listors have done with the rear tires on a 71 - 74 Javelin. I want to use 275-60-15 tires on 15 x 8 wheels but not sure of the backspacing, Can I get some help? Thanks in advance....AL ============================================================= Posted by wixList Archiver -- http://www.amxfiles.com/wixlist