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Old 01-08-2012, 03:49 PM   #1
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Point 03 inches difference

Greetings.

I know the bore for wheels on my 91 AS is 4.25 inches. I'm considering going to 16" wheels and have found wheels with 4.28 inch bores. Is it likely that a difference of .03 inches in the bore size will affect the wheel's performance or correct fit on the axle hub?
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Old 01-08-2012, 04:00 PM   #2
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Does the hub have studs, or threaded holes?

Studs are lug centric and you would be OK. Holes are hub centric and would be a problem.
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Old 01-09-2012, 04:12 PM   #3
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Originally Posted by markdoane View Post
Does the hub have studs, or threaded holes?

Studs are lug centric and you would be OK. Holes are hub centric and would be a problem.

Thanks! my hubs have studs so I'm OK.
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Old 01-09-2012, 04:33 PM   #4
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however... if you have slop in the stud holes, the rim can vibrate and break the studs off. Once two break, the rest will saw through the rim and you can(or likely)will throw a wheel. Then you will not be okay. You might be able to limp on three wheels for another 200 miles if it is a dual axle. Ask me how I know this around the campfire sometime.
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Old 01-09-2012, 05:05 PM   #5
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Most OEM wheels are HUBcentric, which means the hole in the hub is machined to precisely fit over the hub projection on the axle spindle. So, the weight is borne by the hub and the studs basically just hold the wheel to the hub (as well as prevent the wheel from rotating independent of the hub).

Many aftermarket wheels are LUGcentric, which means holes through which the lug studs come through the wheels have a "cone shape" machined into them, and you use a matchingly shaped lug nut. This centers the wheel on the studs, and now the lug studs themselves carry the weight.

With lugcentric, it doesn't matter if the opening is a half inch larger than the hub on the axle; the lug studs take all the load. But if you're setup is for hubcentric, then you have to have a tight fit.

Personally, I think hubcentric is a better design, but I have used the others with no problems as well.

Best of luck!
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Old 01-09-2012, 05:37 PM   #6
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Personally, I think hub centric is a better design, but I have used the others with no problems as well.

Best of luck!
New info = 2nd thoughts about the .25 vs .28. Luck is good and I appreciate the wish but I'm adverse to gambling in any sense. Guess I'd better stay with the spec .25 diameter and sacrifice a style choice or 2 in wheel design. And, maybe those old 15 inch rims are best to keep due to lug design and seating. Vacations/ trips are not a time to add worries.
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