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18x8 Wheels and Tires

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    18x8 Wheels and Tires

    I've looked through old posts-lots of stuff on 17" wheels.

    I was looking at 18X8 wheels with 4.5" of backspacing. I was looking at 245/50 wheels all around- not worried about the rear, but a bit worried about rubbing on the front. Going to be installing speedway springs, so it will be slightly lowered. Anyone have experience with these? They are slightly taller than 255/50R17's, however almost half an inch narrower.

    Thanks
    -Phil

    sigpic

    +1982 Ford LTD-S Police Car. Built 351w, Trickflow 11R 190 Heads, Holley Sniper EFI, RPM Intake+ Hyperspark dizzy, WR-AOD, Full exhaust headers to tails. 3.27 Trac-Lok Rear. Aluminum Police Driveshaft. Speedway Springs+Bilstein Shocks, Intermediate Brakes, HPP Steering Box.

    +2003 Acura CL Type S 6-speed

    #2
    That's only half an inch off center... so it may not have any issues since some folks run 9 inch wide up front and barely rub. If you do have issues... a half inch spacer would sort you out.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

    Originally posted by gadget73
    ... and it should all work like magic and unicorns and stuff.

    Originally posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

    Comment


      #3
      With my 17x8's and 255/50's, 4.5" backspace, i rub fender turning into driveways near full lock, and rub the sway bar a bit at lock. Hope that helps. My car is stock-ish height, although my springs are totally hashed. Rolling the inner fender lip in front definitely helps.

      Comment


        #4
        The big thing to understand is that not all tire sizes are created equal. I used to have 245/45/17’s on my ‘01, I went to 235/55’s, same tire manufacturer, same model of tire and ended up having to run my Eibach Pro wheel spacers to make them fit. And the 235 has 1/2” wider tread area than the 245’s did. A size that may fit one car could be an entirely different story with another brand tire.

        EDIT: I may have installed 245/50’s, I forget! Lol
        '85 CV coupe- 351W, T5-Z, FAST Ez-Efi, shorty headers, 2.5" duals with knock off flowmasters, 2.5" Impala tails, seriously worked GT-40 irons, Comp 265DEH cam, 1.7rr's, Mallory HyFire 6A, Taylor ThunderVolt 50 10.4mm wires, 75mm t/b, 3G alt swap, 140mph PI speedo, PI rear sway bar, '00 PI booster/MC, 95-97 front spindles, '99 front hub bearings/brakes, '92-'94 front upper control arms/ball-joints, 3.73's with rebuilt traction-lok, '09 PI rear disc swap, '96 Mustang GT wheels with 235/55R17's.

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          #5
          Also depends on the wheels. My 245 45R17 tires on the American Racing slot wheels (4.5" backspacing) had no problems up front. The 17" x 7" P71 wheels with 235 50R17 (I think that was the OEM size) and 1.25" spacers rubbed the swaybar. Had I went with 1.5" spacers, I would not have had that problem. It seems to me it's all in the wheels.

          Comment


            #6
            Originally posted by sly View Post
            That's only half an inch off center...
            4.5" BS on an 8" wheel is 0 offset. 8" is the width between the beads, and does not include bead width. A tape measure across the outer edges of the wheel will show 9", for a wheel that is advertised as 8" wide.

            In the same way the diameter is not the gross diameter of the wheel, its the diameter at the beads.
            **2012 Ford Mustang Boss 302: 5.0/ 6 spd/ 3.73s, 20K Cruiser
            **2006 MGM,"Ultimate": 4.6/ 2.73/ Dark Tint, Magnaflows, 19s, 115K Daily Driver
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            **1976 Ford F-150 4WD: 360, 4 spd, 3.50s, factory A/C, 4" lift, Bilsteins, US Indy Mags, 35s Truck Duties

            Comment


              #7
              Originally posted by P72Ford View Post
              4.5" BS on an 8" wheel is 0 offset. 8" is the width between the beads, and does not include bead width. A tape measure across the outer edges of the wheel will show 9", for a wheel that is advertised as 8" wide.

              In the same way the diameter is not the gross diameter of the wheel, its the diameter at the beads.
              Good to know. I wish all the sites I researched wheel sizes on would actually state that. Most of them give one thing or another (BS or offset) but not both and leave you guessing. I do know the offset of the stock wheels are centered and most panthers should be able to handle 9 inch wheels up front and 10 inch out back without issue (maybe a little lip rolling). Personally, I wouldn't run anything that fat unless I was autocrossing it. But that's just me.

              Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
              rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

              Originally posted by gadget73
              ... and it should all work like magic and unicorns and stuff.

              Originally posted by dmccaig
              Overhead, some poor bastards are flying in airplanes.

              Comment

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