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    Results 1 to 5 of 5
    1. #1
      Join Date
      Jan 2008
      Location
      Felton, DE
      Posts
      346

      315/60-15 (30" tall) on 68 Firebird what do i need to do?

      I've decided that i definately want to go with 4.56 gears and that i would like to use a 30" tall M/T ET Street radial. My rims are (i think) 15x8 although I'm not entirely sure. They have 26"x10.5x15 MT slicks on them. I know these exact wheels fit my 94 Camaro with no clearence issues if that helps with determining back spacing. There is a picture in my signature with these wheels on the 68.



      Now i would like to go to a 30" tall tire which i have found that Mickey thompson makes in an ET street radial. I do plan on driving this car quite often and here in DE rain storms come out of nowhere sometimes. Anyway i was wondering what would be required to run these tires with the factory 68 chasis. I think i would also need 15x10 or 15x12 rims wouldnt i? I used to run 315s in 17x11s on my 95 formula but with the added sidewall height i think i can get away with a smaller rim. The car does have adjustable shackles, multi leaf springs, SFCs, and lakewood tractions bars.
      1994 Z28 - 13.52@110mph 2.1 60ft T56, bolt-ons, suspension
      1978 Datsun 2+2 - 6.0L LS1 swap in progress
      1968 Firebird, 2820 dry- 2000 LS1, D&D Viper T56, RAM clutch/flywheel, 236/236 .651/.651 110+4LSA cam, victor JR EFI, 4150 TB, 42lbers, painless harness, Moroso 7qt pan, sfc, trac bars, 3" x pipe side exits, Telstars-30"MT streets/skinnies, mini-tub, 8.5" posi, richmond 4.56s, Hooker lLTs, Denny N20 DS, Fast dual wideband, Shotgun street scoop.
      http://www.myspace.com/shawnmacananny


    2. #2
      Join Date
      Oct 2007
      Posts
      81
      You will never fit a 315/60/15 on a stock suspension firebird unless the tires stick out.My buddy has a camaro thar runs a 315 and it is mini tubbed and has ladder bar suspesion.and the rear of the frame is notched.he also had to stretch the wheelwells a bit.
      1971 GTO convert currently getting the pro touring treatment
      1974 nova streetcar 9.65@143
      1987 s-10 on air,18s tpi 305

    3. #3
      Join Date
      Jan 2008
      Location
      Felton, DE
      Posts
      346
      Thank you! thats exactly what i was wondering. So then i could run the 275/60-15 tires 28" safely then?
      1994 Z28 - 13.52@110mph 2.1 60ft T56, bolt-ons, suspension
      1978 Datsun 2+2 - 6.0L LS1 swap in progress
      1968 Firebird, 2820 dry- 2000 LS1, D&D Viper T56, RAM clutch/flywheel, 236/236 .651/.651 110+4LSA cam, victor JR EFI, 4150 TB, 42lbers, painless harness, Moroso 7qt pan, sfc, trac bars, 3" x pipe side exits, Telstars-30"MT streets/skinnies, mini-tub, 8.5" posi, richmond 4.56s, Hooker lLTs, Denny N20 DS, Fast dual wideband, Shotgun street scoop.
      http://www.myspace.com/shawnmacananny

    4. #4
      Join Date
      Oct 2007
      Posts
      81
      Ya a 275 would fit no problem.
      1971 GTO convert currently getting the pro touring treatment
      1974 nova streetcar 9.65@143
      1987 s-10 on air,18s tpi 305

    5. #5
      Join Date
      Jan 2008
      Location
      Felton, DE
      Posts
      346
      Well i just found that Mickey Thompson sells a 295/65r15 et street radial that's almost 30" in diameter. Do you think they might fit? My wheels wells are not sacred if i need to do a little beating, banging and cutting thats fine with me. I do have shackles and an 8.5" rear from a 74 nova.
      1994 Z28 - 13.52@110mph 2.1 60ft T56, bolt-ons, suspension
      1978 Datsun 2+2 - 6.0L LS1 swap in progress
      1968 Firebird, 2820 dry- 2000 LS1, D&D Viper T56, RAM clutch/flywheel, 236/236 .651/.651 110+4LSA cam, victor JR EFI, 4150 TB, 42lbers, painless harness, Moroso 7qt pan, sfc, trac bars, 3" x pipe side exits, Telstars-30"MT streets/skinnies, mini-tub, 8.5" posi, richmond 4.56s, Hooker lLTs, Denny N20 DS, Fast dual wideband, Shotgun street scoop.
      http://www.myspace.com/shawnmacananny





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