Before mounting a rim. One should check its radial and lateral runout on a balancing machine.

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• 0.05-0.30 mm = Excellent
• 0.35-0.50 mm = Very Good (no action required)
• 0.55-0.80 mm = Borderline (no action required, if Road Force balance is ok, and no vibration at highway speeds)
• 0.85-1.20 mm = Likely to vibrate, highly recommend straightening
• Over 1.25mm = Almost guaranteed to vibrate, definitely needs to be straightened

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You might want to read also about wheel runout