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73-87 Chevy _ GMC Trucks => Wheels & Tires => Topic started by: FritzA on May 25, 2010, 06:34:01 pm
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Hi all,
I have a 77 C20. The glove box option sticker says it came with 8.75 x 16.5 wheels. When I bought it, it came with 235/85/16s on it.
I don't think the wheels were changed out ever, does it make sense that someone put 16 inch tires on a 16.5 wheel?
Looking at Firestone Transforce specs, the 235/85/16s have a larger overall diameter than the 8.75 x 16.5. I like the bigger diameter for the gearing on the highway.
If the wheels are the original 16.5, is it safe to put the 235/85/16 tires on them?
Thanks for the help in advance.
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One more question....
Is there a marking on the wheels to tell if they are 16.5 vs 16?
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I would hope no one put 16 inch tires on a 16.5 rim. I wouldnt think it would be possible, but working in the oilfeild, I have learned anythings possible. If they did, I would get them changed quickly, but I doubt they did.
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Measure them and see what the dia of the rim is rim to rim
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Prob someone switch out the rim and wheels cause a. 16 maybe a little cheaper or b. They had 16s just laying around or given to them but like chop said anything is possible
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16s will air up on 16.5 but it is dangerous a 16.5 wheel will have an angle from the lip of the wheel to where it makes the turn down to the off set. A 16 will stay almost flat. A halfway trained eye could tell in a second. If you could post a close up pic I could prolly tell from that but angles are hard to see in pics sometimes.
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Also sometimes wheels are marked on the back or inside the wheel where you cannot see with a tire mounted.
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All the 16.5 rims I have seen have the size stamped on them. Usually on the outside of the rim and they usually say something about not mounting 16" on them.