1970 Grand Prix Tire Sizes..
 

1970 Grand Prix Tire Sizes;
I'm restoring a 1970 SJ 455 Ho / 4-Speed LOADED, NO A/C, Silver/Black Leather
I have 4, 7" X 15" Rally II wheels.
What size tire combos do you recommend?
I Like to get a bigger tire on the rear.
What's the biggest tire I can put on the rear without rubbing?
Any comments or advice is much appreciated,
I posted this before but can't find my thread.
Thank you in advance..:
BIG BLOCK JAMO
(818) 209-6590
paulbjamieson@hotmail.com

63 Catalina 421, Tri-Power, 4-Speed, w/ Console, Ventura Interior, 8 Bolts (Disc), Tach, Tilt, Deluxe Wheel, Power / Windows, Steering, Brakes
64 GTO 455, Tri-Power, 5-Speed, w/Console, 12 Bolt 3:42, 4 Wheel Disc, Tach, Tilt, 4 Spoke Wheel
66 2+2 Convertible 421, Tri Power, 4-Speed w/Console, 8 Bolt (Disc), P/Top,Windows, Steering, Brakes AM/FM,

Paul,

I am running 255 60 15's rear and 245 60 15's on front.
I do not have any rubbing while turning steering wheel lock to lock.
I would think there are many other configurations that work but wanted to give you some feedback.

Larry

im running 275s on the back but im running 8 inch rims .I agree with post above 255/245

275/60-15 fits with ease and that is a 28" tall tire. A 295/50-15 ran close for me but okay. I have seen a '70 GTO with 305's, but do not know if a GP can get there.