The next size up that would make any real difference would be 13.6x38", but you would probably need new rims for that size, so I would actually recommend 15.5x38" and 14" rims..
You didn't say want tractor you are working with...
On a JD "B", for flotation, I would use 13.6x38"..I have 12.4x38 on mine now and they do cut in and leave ruts more than I like.. If I find a good set of 11" rims, I am going to change to 13.6x38 and they won't look out of place on it.. Duals are a problem, if they ball-up in mud and you have to dig it out before you take them out on any road..sometimes I have resorted to removing the duals to get it cleaned out..!! Not sure what tractor you have..if it is an early unstyled, 10x38 may already be an over-size..8" being the original size.. Do need Ag-type tires, or turf tires..?? Remember, 12.4x38 is the same as the old 10x38", so be careful which size you choose..!!
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