z ya Posted March 21, 2001 Share Posted March 21, 2001 I have a 70 240 with stock struts and no flairs.I want 225/50/15 euro t/a 's on 15x7 Centerline convo pros.Backspacing is 3.5(no offset).The rears are 245/50/15 euro t/a's on 15x8.5 convos with 4.25 offset. If I had to go with coil overs to make it fit in the rear I will do so.What do you guys think? Quote Link to comment Share on other sites More sharing options...
Guest scca Posted March 21, 2001 Share Posted March 21, 2001 rears are a "maybe. but DEfinitely will need coilovers to clear the 8.5" rim.. Pete will be able to tell you if the offset will work on a unflared car.. ------------------ Mike mike@fonebooth.com http://www.outlaw-brakes raceparts and brake upgrades. Quote Link to comment Share on other sites More sharing options...
Danno74Z Posted March 21, 2001 Share Posted March 21, 2001 If I understand the question correctly both front and rear rims have the same offset -12. Front - 15"x7" w/3.5" backspacing has a -12mm offset. Rear - 15"x8.5" w/4.25" backspacing also has a -12mm offset. As a general rule, backspacing is measured in inches and offset is in millimeters. The more positive the offset >0 the more the wheel/rim is towards the interior and <0 towards the fender. In your case for the rears an 8.5" rim to fit w/o flares you would need a 5" BS/+6mmOS to 5.5"BS/+19mmOS. I believe this should get you in the ballpark. I'm going to use 8" rims with a 5-1/8" +15mmOS and I feel very confident these will fit w/coilovers unflared. Danno74Z Quote Link to comment Share on other sites More sharing options...
pparaska Posted March 22, 2001 Share Posted March 22, 2001 I don't know the exact number for backspacing you'll need, but it's much closer to 5-1/2 inches than 4.25" (you meant backspacing, not offset, right?) on an 8.5" rim. My spec for my rear wheels WITH coilovers and a 1/2" thick brake rotor hat are 149 mm backspacing (5.866 inches). But that's with a 17x9 inch rim. A shorter rim won't allow as much backspacing. I don't think the 8.5s with 4.25" (backspacing) will work off the top of my head. You'll have to do the dirty work and get in there and measure. HTH, ------------------ Pete Paraska - 73 540Z - Marathon Z Project pparaska@home.com Pete's V8 Datsun 240Z Pages Quote Link to comment Share on other sites More sharing options...
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