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It is also a lot easier to find a replacement tire/wheel locally also. Not to mention you can run some pretty sweet retreads if you can't find a deal on used ones.
12r22.5 tires are the direct replacement for 1100R20 and I know several people who have ran them next to each other. Matter of fact there are direct cross overs from tube type to tubeless for the major sizes. 1000r20=11r22.5 1000r22=11r24.5