Hubby's sleeping so I can't verify, but I would think the 60 would make the front lower - raising the back, which in turn makes the bike turn quicker... but could also make it easier to lose too.
I think you might also have to factor in the tire brand. If I remember correcly some manufacturers have the same size tire - 120/70 but the actual dimensions of it are different therefore you have to set the bike up accordingly.
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