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    AeroPress Wheel Variable

    Grinder retention / loss

    Grind & Particles · Measured metric

    Coffee retained in the grinder or lost during transfer.

    Measured metric
    Grind & Particles
    Wheel face
    Measurement-friendly
    Competition practice
    Inferred
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    Definition

    Retention and transfer loss describe coffee that does not make it from bean dose to brewer dose because it stays in the grinder or is lost in handling.

    Why It Matters

    It changes the actual dose into the brewer and can silently break mass consistency.

    Measurement Options
    Dose in vs dose out on a scale
    Page Context

    Grinder retention / loss is part of the Brew Supply AeroPress Wheel and helps brewers describe coffee retained in the grinder or lost during transfer.

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    Related variables
    Affected outcomes