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I put a 150 metzeler on mine and it was tight but fit no problem. The dealer advised me not to use a 150 dunlop, because they "grow" a little when they get hot and they might rub. Very happy with the choice.
I agree with what has already been posted. There are threads here on HDF where guys have squeezed 160's on their rides. So I imagine the bike model and year have something to do with it. On my bike the 150 was REAL tight. Enough so that I went back to a 140 when I needed a new tire.
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