It's nothing to lose sleep over... An 8.50 wide tire fits a 7 inch rim. A 10.50 tire normally goes onto a 7.5 inch rim. The 10.50 tire will fit the 7 inch rim ok, it will just simply pull the tread in on the sides some. I mounted the wide tire on a 7 inch rim with no issues. Some guys in here have mounted the 8.50 tire onto the narrow 6 inch rim and they look awesome on the older cubs. Don't over think it too much. And yes, they are 23 inches tall. The rim is 12 inches from top to bottom.
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DWayne
1973: 128, ag tires, 3pt. lift, spring assist, lights, 42" Deck
10" moldboard plow
2016 XT1 42" deck 18HP
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