Posted by ScottyHOMEy on December 19, 2009 at 15:46:46 from (71.241.215.22):
In Reply to: Re: Farmall BN Rims posted by Gerry BN on December 19, 2009 at 14:56:15:
I have the same catalog (perhaps a different edition, but basically on spot). Assuming you are looking at Item 4, the rims. The variations are width, ranging from 7" to 11". And that might explain any differene you are finding in the relative position of the lug/bracket in relation to drop in the rim. The narrowest rims would have had the lugs closes to the drop. The lug would then move toward the center as the rim gets wider, to keep the tread of the ty/ire centered at the designed widths. All of them wold have been original, but will make a difference in what size tire is appropriate for them.
The most common over here in my experience is an 8" rim, with a 9.5"x24" tire. On that rim, the outer face of the "block that the bolt head recesses into is roughly even with the drop. I'll have to go out and take a coupole of measurements on my 8" rims tomorrow and will forward them along if they're helpful. And maybe Gene Bender or some of the others will chime in with where the rim width is measured.
If the size of the tires that are on are discernible, that MAY be a bit of a clue, but there are several caveats to that. First I'm assuming that you all use (or used at the time) the same system for tire sizes.
Second, is that over the years, the measurements taken to describe those sizes has changed. I have a catalog that describes the equivalent sizes over the years that may be helpful, so if you waant to post back here or email, I can look up what you have, which ought to help nail down which rims will work for you.
Lastly, depending on their relative sizes, there can be some cheating up and down on the size tires that can be successfully mounted to a given rim. I don't know that it works specifically in this case, but for the sake of an example, a 9.5x24 is primo on an 8" rim, but might work on 7" (tight and a little bulbous-looking), or a 9" (small looking but able to hold a bead.
Let us know what you find for a tire size, and I'll get some measurements myself tomorrow.
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