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Discussion Starter #1
I m restoring my 64´, currently have a 20/245/40 but I wanto leave it, original but with a look sport.
I m in Argentina, and we have only two Alternative R14/235/60 or R15 /235/50.
I will appreciate if There are some pictures.

regards
 

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That's a 64 Bonneville not a GTO.
I would go with the original size in a modern radial equivalent. 235/75R14. If you can't get that in Argentina maybe you can get 235/75R15?
 

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Both of those tire sizes are somewhat odd, at least here in the US. I'd look into what I could find locally for wheels with a 5" bolt pattern before settling on either.
 

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With all due respect 235/75R15 is a very common size here in the US. I'm in the tire business, tires are my world. The 235/75R14 is an oddball but is offered by Coker and is absolutely the best tire for the full size Pontiac's Catalina, Bonneville's etc. I have three Bonneville convertibles with 8 lug 14'' wheels. The 235/75R14 is the perfect tire for the car. But being that this guy is in Argentina, I would recommend getting 15'' wheels and running 235/75R15.
 

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235-50R15's are common, what did they come on?
I autocrossed and streetraced one of my T/A's in the '80's, went through a LOT of very sticky 255-60R15's. Considered some Comp T/A 50 series tires, but all were too short and interfered with the seatbelt bulge in the rear wheelhouse.
 

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235/50R15 (24.2'' OD) is way too short for a full size 64 Bonneville. And very much an oddball size today.
The 235/75R15 is 28.9'' OD and 235/75R14 is 27.9'' OD.
 
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