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"Sure a wider tire
will give better traction; bigger contact patch to transfer the power to the ground. The 78 series tire has pretty much disappeared; the 75 series tire replaced it." I've seen '68-'72 A-bodies with 255/60R15 on the back & either 235 or 245/60R15 on the front. Looks great and a 255/60R15 is 27.04" tall which is very close to your G78-14 at 27.06". 235/60R15 = 26.10" 245/60R15 = 26.60" 255/60R15 = 27.04" G60-15 = 26.44" H60-15 = 27.08" 235/60R15 = 26.10" 245/60R15 = 26.60" 255/60R15 = 27.04" (235mm * .60) / 25.4mm per inch) * 2 + 15" = 26.10". I've had the wheels off but I never checked the rim size. I thought Rally wheels only came in 14 X 6. Do they come in 14 X 7?
Yup... 14x7 Rally II 4.75" B.C. JH JJ JK JS KS GM# 525709 69-75 Firebird
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