Tires and rim width

[SMatson802@aol.com]

I am looking to go to 175-70/13 tires.  The spec sheet at the tire mfg says 
minimum width is 5 inches and the Spitfire spec book says that stock on my 
'71 is 4.5.  I have seen a number of people with 175's on what appear to be 
stock wheels.  What can I get away with and what difference will it make?
Thanks,
Steve

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