Input lever
Grind & Particles
Wheel face
Grinder model
The grinder used to prepare the coffee.
AeroPress Wheel Variable
Fines share
Grind & Particles · Process state
The proportion of very small particles.
Process state
Grind & Particles
Wheel face
Technical science
Competition practice
Definition
Fines share is the amount of the smallest fraction in the grounds and one of the biggest drivers of flow and clogging behavior.
Why It Matters
Fines extract quickly, migrate easily, and can sharply change pressure and texture.
Page Context
Fines share is part of the Brew Supply AeroPress Wheel and helps brewers describe the proportion of very small particles.
Related variables
Input lever
Grind & Particles
Wheel face
Burr set
The burr geometry installed in the grinder.
Input lever
Grind & Particles
Advanced detail
Burr alignment
How evenly the burrs are aligned.
Input lever
Grind & Particles
Wheel face
Grind setting
The selected grind size setting.
Input lever
Grind & Particles
Wheel face
Grind speed / RPM
The speed at which the grinder is operated.
Input lever
Grind & Particles
Wheel face
Sieving
Separating grounds by particle size after grinding.
Affected outcomes
Measured metric
Cup Outcome
Wheel face
Beverage TDS
Measured total dissolved solids in the served beverage.
Calculated metric
Cup Outcome
Wheel face
Extraction Yield
Calculated percentage of coffee mass extracted.
Measured metric
Cup Outcome
Wheel face
Beverage Yield
The liquid beverage mass collected or served.
Cup outcome
Cup Outcome
Wheel face
Aroma
The smell of the brewed coffee.