Re: 17.5" Wheels
1969_CM2590D, these were an optional upgrade I believe for HD towing and campers; stuff like that. They also came in 19.5's and those are tough to find.
(photo of 1961 Chvy)
The tires are still available but pricey. It's just easier to source the 16" tires. My 70 and 73 both have 16.5's and I've not had issues with the tires except for one blow-out.
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1961 GMC Suburban 305A Overdrive
1962 GMC Utility 305D
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