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



Shawn MacAnanny
03-07-2008, 01:13 PM
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.

novaracer_2000
03-07-2008, 01:49 PM
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.
https://static1.pt-content.com/images/pt/2008/03/Cnv0041-1.jpg

Shawn MacAnanny
03-07-2008, 05:56 PM
Thank you! thats exactly what i was wondering. So then i could run the 275/60-15 tires 28" safely then?

novaracer_2000
03-07-2008, 07:29 PM
Ya a 275 would fit no problem.

Shawn MacAnanny
03-09-2008, 05:22 AM
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.