B61Hobby Posted June 28, 2020 Share Posted June 28, 2020 Hey there everyone. I recently picked up my first MACK. It is a 1961 B61 6 wheeler. I will snap some picks and post in the introduction forum soon. My first purchase will be new rubber for the old girl. It currently has 11.00 - 20's on split rings. I am looking to get the split rings out from under the truck due to ease of finding rubber as a reasonable price. It seems I can get a 11R22.5 way easier and cheaper than a 11.00 - 20. I will also not have to deal with the garage preaching about how dangerous the split rings are. As you all know, this forum is great and I think I have it almost all figured out. I am understanding that the 11R22.5 is a direct replacement for the 11.00 - 20. My question is this, am I looking for a 8.25x22.5 open center wheel? I am looking at buying a 8.25x22.5 open center wheel and mounting a 12R22.5 tire on it. Why the 12R? Because it seems a bit easier to get than the 11R. I think that covers it, thanks in advance for the help. Quote Link to comment Share on other sites More sharing options...
Swishy Posted June 28, 2020 Share Posted June 28, 2020 gudday m8 here in Australia mostly we ran 1000x20 tube tyres until they went to tubeless tyres bout 1975 we could run 1000x20 along side a 11R22.5 therefor a 1000x20 tubes is equivelnt in diameter to a 11Rx22.5 tubless cya 2 Quote Link to comment Share on other sites More sharing options...
j hancock Posted June 28, 2020 Share Posted June 28, 2020 Both the 11R and 12R22.5 are DOT approved for mounting on an 8.25 X 22.5 tubeless rim to replace the 20" tube type multi-piece rim. 2 Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
mowerman Posted June 28, 2020 Share Posted June 28, 2020 yes they have tubeless rims now,on spokes....im fixen on swapping mine out also.....but i hope you have a big wallet.......lol.good luck,,bob Quote Link to comment Share on other sites More sharing options...
mowerman Posted June 28, 2020 Share Posted June 28, 2020 i used to work on those all day long,,,,at 17 years old in a tire shop.....1973......they didnt bother me a bit,,,i used to sit on them,,while i was inflating them..now at 64,i would feel better with solid rims...bob 1 Quote Link to comment Share on other sites More sharing options...
B61Hobby Posted June 28, 2020 Author Share Posted June 28, 2020 1 hour ago, j hancock said: Both the 11R and 12R22.5 are DOT approved for mounting on an 8.25 X 22.5 tubeless rim to replace the 20" tube type multi-piece rim. Do you think the depth of the new 8.25 rim will work on the rear axle? Do you think I will need a new spacer? I am a total newbie with the spokes. I guess I could just order the new rims and tires and see. If the worse thing I run into is needing new spacers, I will be in good shape. Quote Link to comment Share on other sites More sharing options...
B61Hobby Posted June 28, 2020 Author Share Posted June 28, 2020 Thank you everyone. I am stoked to be on this forum. Quote Link to comment Share on other sites More sharing options...
terry Posted June 28, 2020 Share Posted June 28, 2020 1 hour ago, mowerman said: i used to work on those all day long,,,,at 17 years old in a tire shop.....1973......they didnt bother me a bit,,,i used to sit on them,,while i was inflating them..now at 64,i would feel better with solid rims...bob If you sat on a split rim, while airing it up you were playing Russian roulette! terry 2 Quote Link to comment Share on other sites More sharing options...
j hancock Posted June 29, 2020 Share Posted June 29, 2020 10 hours ago, B61Hobby said: Do you think the depth of the new 8.25 rim will work on the rear axle? Do you think I will need a new spacer? I am a total newbie with the spokes. I guess I could just order the new rims and tires and see. If the worse thing I run into is needing new spacers, I will be in good shape. You "should" be OK on the rear. Like you said get them and try mounting them up. Spacers can be had in different widths depending on application but you then may have to get different depth rim clamps (lugs or wedges) to make the combo tighten properly to the spoke hubs. Best not to open a can of worms quite yet. 2 Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
Maddog13407 Posted June 29, 2020 Share Posted June 29, 2020 if the truck is original in the back is should have 3 5/8s spacers on it. you might have to go to a 4'' wide spacer and get shorter wedges. I have 12 r 22/5's on the back of a single axle B model dump and they are close but don't touch. guess youll have to try with it loaded and see how much they squeeze together with some weight on it 1 Quote Link to comment Share on other sites More sharing options...
doubleclutchinweasel Posted August 3, 2020 Share Posted August 3, 2020 Still plenty of new demountable tubeless rims out there. Accuride is one of them. As I recall, 20" tube-type and 22.5" tubeless are interchangeable (small spider), and 22" tube-type and 24.5" tubeless are interchangeable (large spider). Somebody correct me if I remembered that wrong. I also had another tube-type rim on my truck. It was the 3-piece design (see below). Accuride still lists these. Had a solid (not split) outer rim. Press the outer rim down and put the split lock ring on. When the air built up, it pushed the solid outer rim over the split lock ring, squeezing it down, rather than pushing it out. A lot better than a 2-piece widowmaker, but still nowhere near as good as a 1-piece tubeless setup. I recall seeing that same 3-piece setup somewhere else with an o-ring to seal it up and use tubeless tires. Never had any experience with one though. https://www.accuridecorp.com/sites/default/files/resources/2020-01/W1.000 Rev.5 Accuride Wheels Product Catalog.pdf Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment Share on other sites More sharing options...
mrsmackpaul Posted August 3, 2020 Share Posted August 3, 2020 Earthmoving style rims have that o ring your talking about when tubeless As far as spacers go, if you find you need a wider spacer just weld a bit of 3/8 rod around, if still need more space weld another piece of 3/8 rod around the other side Just need to make sure the wedges dont bottom out on duels Paul 1 Quote Link to comment Share on other sites More sharing options...
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