SM Tire Size

At the SM time they called 14.9X38 13X38 and that was one tire option for a SM on 11 or 12 inch wide rims as listed by IH. Not the recomended rim width from tire manufactures, but lots of different size tires have been mounted on rims other than ideal.
 
My opinion is don't go less than a 12 inch rim. The tire will fit better on a 13 inch. Also, due to the diameter of the tire the ground speed will increase.
 
Just to "add" to the statements.

My 14.9s are on 12" rims and I would not personally put them on any more narrow of a rim,but you can get away with 11" rims.I have seen it done more than once.
 
All the new Super M"s I ever saw here in Michigan came with 13-38 tires. The new M"s built after WW II came with 12-38"s, before that some with 11-38"s, and some with 12-38"s. Most 400"s had 13-38"s, but some had the 15.5-38"s like all the 450"s and 560"s had.
 

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