If a wheel is built properly there shouldn't be any 'settling in' period. They should start true and stay true, and if they don't then they were built with uneven spoke tension and/or not stress relieved properly.
@Regal started
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If a wheel is built properly there shouldn't be any 'settling in' period. They should start true and stay true, and if they don't then they were built with uneven spoke tension and/or not stress relieved properly.