Shinko 705 in a 4.10 X 18 and a 110/80 -19. I did not research size changeover but the 705 may work very well for you if it'll fit.
Beware those with no sense of humor as they will cause you misery.
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'11 GSA supertanker/mothership, '11 Suzuki Burgman 400, '06 KTM 640A