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Posted by Jim.UT on July 13, 2005 at 08:33:22 from (220.127.116.11):
On my '69 Dodge D300 that I recently purchased I have one really bad tire. I found a decent used one (7.50-16) but that's when I discovered that 5 of my rims are split rims. One rim on the front is a recent replacement and is not a split rim. The spare tire is also on a split rim.
I thought I might try to find 5 more non-split rims. In asking around I found that my split rims are "coined" rims, that is, alternating lug holes are either cupped or have a raise ridge around them. I guess they are designed that way so that the rear duals interlock with each other. I've been told that used coined rims are impossible to find because everyone is looking for them. I didn't even know what a coined rim was until yesterday.
So one used rim seller said I need to make sure my hubs are flat and not coined before I go spending money on rims that won't work. Good advice. So I have pulled all the wheels off the left side of the vehicle. Both dual rims are definitely coined but the hub appears to be flat with cupped indentations around each stud. On the front is where the non-split replacement rim is and it seems to work fine on that hub. The front hub is like the rear...cupped rings around each stud but no raised ridges. It appears to me that either a coined or a flat-faced rim will work fine. As for the interlocking of the dual rims, I don't see that as terribly important. The eight studs will keep the rims where they need to be, right?
I'd be curious to know what you "experts" know/think about coined rims and split rims. As it stands now, I've found someone who is willing to mount my $10 used tire on my split rim. That will certainly be cheaper than buying an entire set of non-split rims. Still I'd like to know more on the subject for future reference.
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