Input lever
Grind & Particles
Wheel face
Grinder model
The grinder used to prepare the coffee.
AeroPress Wheel Variable
Boulder share
Grind & Particles · Process state
The proportion of very large particles.
Process state
Grind & Particles
Detail panel
Technical science
Definition
Boulder share is the portion of the grind that extracts more slowly than the bulk of the coffee.
Why It Matters
Too many boulders can reduce total extraction or make the coffee feel simultaneously thin and harsh.
Page Context
Boulder share is part of the Brew Supply AeroPress Wheel and helps brewers describe the proportion of very large 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.