How to fit a 275-315 on the front?

Discussion in 'Pro-Touring' started by Yanchik, Jan 6, 2018.

  1. Yanchik

    Yanchik Well-Known Member

    Hello, I've seem some videos where 70-72 A-Body owners have 275-315 tires in the front as well as the rear.

    Aside from proper tire width/backspacing, how do these people fit such big tires in the front?

    My guess is they do some kind of inner fender modification, but will the frame need to be modified or altered in any way?

    Any input is greatly appreciated. Thank you!
  2. hugger

    hugger Well-Known Member

    Yes it will require huge modifications
  3. pro tour gsx

    pro tour gsx pro tour gsx

    275 40 17 in front fits, just have to remove the 1 bolt at the top of the inner fender . not much room to any bigger. In the rear 315 35 17 fits pretty easily , I rolled the fender lip a bit .
    lostGS likes this.
  4. Yanchik

    Yanchik Well-Known Member

    Really? I know a member on here whos running 265/45/18 on the front without any modification. His tire is about 27.2 inches tall and yours is a little uner 26 inches.
    Were you getting rub on the top bolt of the inner fender?
  5. pro tour gsx

    pro tour gsx pro tour gsx

    yes it would rub a little on the bolt , you could just use a flush allen bolt or something . Also car was dropped about 2 inches .
  6. pbulski

    pbulski Well-Known Member

    Agree with what the others have said. I'm running a 275/35/18 on the front of my '71 GS and it only rubs at the top fender bolt. Removed that one bolt and no issues. I've got 295/35/18 on rear and no problems with clearance.

    Good luck!
  7. Project"LARK"

    Project"LARK" Member

    I have a 70 skylark custom it’s still well in the project stage lol. I just bought some 18x8 fronts and 18x9.5 wheels for it! I can’t decide on the tire size I know I want the widest Tire I can run on the back but y’all any suggestions on Tire sizes to make it look good. It is factory height at the moment!

    Attached Files:

  8. pbulski

    pbulski Well-Known Member

    You can see my tire sizes above but I forgot to mention that I've got Ridetech Stage II coilovers all the way around and 2" drop spindles on the front. Maybe someone at stock ride height can help. Honestly the wheel offset is where all the fitment magic happens. The guys at Budnik were very helpful when I bought my wheels. You may think about reaching out to the manufacturers of your wheels for some guidance. Good luck with the project.
  9. Project"LARK"

    Project"LARK" Member

    Thanks, it got all way to go but it will get there! With a lot of blood sweat and tears

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