US NDCC 11:00x20 direct replacement
Hi Cory
As said by others US NDCC 11:00x20 are a direct replacement with no modification to rim necessary. I think your real question is driven by your location Bittern, VIC which not every one is noticing is in Australia, so if I might which tires or vehicles in Australia would be appropriate direct replacements which would not require modification to the tire or rim.
As stated US NDCC 11:00x20 make a nice replacement, they give a CMP a little rubber overdrive for the highway. As to them fitting the rims there has been an issue of some tires being made for a different rim angle. I have not found on any of my CMPs that this has been an issue. What I have found is that the rims need to be very clean and if possible painted. Passed experience as shown that cleaning the rim very is important. But be careful of over aggressive use of a sandblaster you want the remove the rust but not roughen the metal. Very fine grade blast media, clean then paint the rims let the paint really dry before mounting the tires.
You will appreciate the time and effort of cleaning and painting the rims the next time you un-mount a tire.
Only other modification to new tires I've encountered is needing to trim casting excess and smooth the lip of the tire that first makes contact with the rim. Use lots of the rubber lubricant.
With used tires cleaning the rim areas to remove any dirt, paint or rust.
Please let us know how you make out.
Cheers Phil
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