Input lever
Coffee Material
Wheel face
Origin
The geographic and agricultural source of the coffee.
AeroPress Wheel Variable
Defect risk
Coffee Material · Risk flag
The likelihood that the coffee carries roast, green, storage, or process defects.
Risk flag
Coffee Material
Detail panel
Competition practice
Inferred
Definition
Defect risk summarizes the chance that the raw coffee material contains off-notes or structural problems that brewing cannot solve.
Why It Matters
A recipe can only control brewing variables; it cannot fully repair defective material.
Risk Note
This page describes a diagnostic warning, not a directly measured variable. It is useful for diagnosis and recipe debugging, but it is not a direct control lever or direct measurement by itself.
How To Observe
- Cup the coffee and watch for phenolic, moldy, flat, baggy, or harsh notes.
Page Context
Defect risk is part of the Brew Supply AeroPress Wheel and helps brewers describe the likelihood that the coffee carries roast, green, storage, or process defects.
Related variables
Input lever
Coffee Material
Detail panel
Variety
The genetic variety or cultivar of the coffee plant.
Input lever
Coffee Material
Wheel face
Process
How the coffee was processed after harvest.
Input lever
Coffee Material
Wheel face
Roast level
How light or dark the coffee was roasted.
Input lever
Coffee Material
Detail panel
Roast development
The internal development of the roast, not just the color.
Input lever
Coffee Material
Detail panel
Roast date
The date the coffee was roasted.
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.