On my 122, I have 16x6.50-8's, which I believe are the originals from Goodyear. I see a lot of pictures of similar in the old brochures. The rear tires are Carlisle Power Trac's, 23x8.50-12 and those have been discontinued as far as I can tell.
My 107 came with a hodge podge of tires, so I replaced them all with 170/60-8 Vredestein V61's (close metric equivalent to a 16x6.50-8) and 23x8.50-12 Carlisle Tru-Powers.
I'm happy with all.
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1966 Cub Cadet 122
1968 John Deere 110
1968 Cub Cadet 104
1971 Cub Cadet 107
1975 Cub Cadet 1650
2 Brinly Plows, Brinly Disk, Brinly Grader Blade, Brinly Box Blade, 3-42" decks, 1-50" deck, a Sears 3 pt hitch I bought for $20, a couple dual wheel adapters, CW36 & QA36 snow throwers, 1A tiller, and a partridge in a pear tree.
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