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Guys, this is related to an almost dead horse topic on what wheels can fit on my '65 442. I take solace in that it's a frustrating thing for a lot of guys as I searched threads here and other sites. First, I'm trying to identify offset and backspace for this stock 15x7 rim. I'd have thought it'd be simple to find that info, but so far my searches have not panned out dimensions. I've got 225/60 15's on it now. I want to put a set of American Racing 200S 'coke bottle' rims back on it like I had in HS many, many moons ago. They don't make these wheels anymore as a stock item, so it's either find a used set of 15/16/17" out there that I can figure out how to match fitment or win the lottery to order a new set. I've no doubt someone knows this info off the top of their head here. And, if anyone knows of a online calculator that I can put my current wheel and tire spec in and have it provide alternative sizes to equal the originals I'd be very appreciative for that! Thx!
No, I'm not. I did measure to the outside of the rim lips and that gave me 8" wide. From a page in the Oldsmobile 4-4-2 and W-Machine Restoration Guide there's a footnote in the wheel chart towards the back of the book where I read that the rim width is from the inner lip of the rim, so those appear to be 1/2" offset from the rim lip. That's where I am assuming they're 7" wide rims. A long story of why, but my jack is down at my dad's house so I can't just pop a wheel off to see if I can find a stamping number.
And, if anyone knows of a online calculator that I can put my current wheel and tire spec in and have it provide alternative sizes to equal the originals I'd be very appreciative for that! Thx!
Just to close this loop. I had time to get the wheel off and it's a stock 15x7 dated to 1985. Measures a 4 3/8 backspace, and if am doing it right about a 6mm negative offset. So with that and the dimensions of what I've currently go I think there's enough to be dangerous now. Thanks for the responses.
