If I'm following what you are talking about, I had the same problem on my 147 when I bought the same tires for the front. I had bought one in 2012 and then bought another one in 2014 just to notice, although the tire size was the same, it was a smaller tire. I contacted Carslile about the problem and they sent me another tire. I ended up putting two new tires on the front of my 147 and I was happy with it. My guess is that with a bit of age they grow in size about 1-2 inches.
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Daniel G.
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(May 1970) 147 w/an IH spring assist, 48" deck, 42" blade, 1969 73, #2 trailer, 10" Brinly plow and (on loan) Dad's #2 tiller.
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