Harmonics on a 20" tire start around 70mph so balance or out of round are suspect as others have pointed out.
70 is max for me and I prefer 65 top end. (Not telling you eat to do) but even if lower speeds are not a problem the tire wear and impact on the drive train from balance are worth fixing.
JMHO.
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2010 Damon Daybreak 3204 Sport, bunkhouse with Jeep Wrangler toad.
Improvise, adapt and overcome... "Semper Fi"
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