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The 180/65-16 isn't available yet but the E3 in 180/60-16 and 180/70-16 are available. The difference is imperceptible, a couple millimeters at the most.
Those E3 sizes are radials. Is the jury in yet with a verdict on using radials on HD's? I certainly would hesitate putting a radial rear with a bias front.
So I wonder what the scoop is on using radials on HD's. I can't see how it would cause problems, and the reason they're usually never discussed is that there have been few or no radial sizes available.