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I remember when my dad had the series 4 original tires replaced at the local Goodyear store. They installed 5.90 bias ply tires and when I saw it I said NO! They then replaced them with 6.50 tires. Looked much better. It now has 175/70 R13, the red Harrington has 175/80, the other two Harringtons are setting on 175/70, the 69GT has 175/70 Dunlops and the series 5 rides on 185/70. It has five correct date coded wheels and have never had a problem. The 69 has the original factory mounted radial spare tire still hanging under the trunk floor. It's a 165 and probably still has the NOS air in it.Posted as information.
Factory Alpine steel wheels were 13" x 4.0" for S-1 through S-IV and 13" x 4.5" for the S-V.
Alpines came with 5.60 / 5.90 / 6.00 - 13" tires. The radial equivalent of a 6.00-13 is 155/80-13.
The tire manufacturers list an acceptable wheel width of 4.5-6.0" for 175 mm section width tires.
According to the tire makers, 175/70-13 tires would be marginal on S-V factory wheels and too wide for S-I through S-IV factory wheels.
Just the facts, YMMV.