Timemore Chestnut C3 to Fellow Opus

A V60 grind of about 15 clicks on a Timemore Chestnut C3 is roughly 4.5 on a Fellow Opus. Both land near 560 µm, a medium-fine grind.

Timemore Chestnut C315 clicksV60 setting

Fellow Opus4.5V60 setting

Particle size ~560 µmGrind Medium-fine

Settings by brew method

Brew method	Timemore Chestnut C3	Fellow Opus
Espresso~250 µm	7 clicks	1.25
Moka pot~350 µm	10 clicks	2.25
AeroPress~450 µm	12 clicks	3.25
V60~560 µm	15 clicks	4.5
Chemex~700 µm	18 clicks	6
French press~900 µm	23 clicks	8.25
Kalita Wave~600 µm	16 clicks	5
Cold brew~1100 µm	28 clicks	10.25
Siphon~650 µm	17 clicks	5.5

Both grinders are mapped to one particle-size scale, fitted from the Honest Coffee Guide's per-method charts. It is not manufacturer burr-gap data, so treat this as a starting point and adjust by taste.

Go the other way

Fellow Opus to Timemore Chestnut C3

More about these grinders

Questions

Is 15 clicks on a Timemore Chestnut C3 the same as 15 clicks on a Fellow Opus?

No. The two grinders count in different steps, so the same number gives a different grind. 15 clicks on the Timemore Chestnut C3 matches about 4.5 on the Fellow Opus.

How accurate is this conversion?

It is a starting point. Both grinders are mapped to particle size in microns, fitted from the Honest Coffee Guide charts for each brew method, not from manufacturer burr-gap specs. Beans, roast and burr wear change the result, so adjust by taste.

The coffee tastes sour or bitter after converting. What should I change?

Sour and thin: grind finer by a step or two. Bitter and harsh: grind coarser. Change one thing at a time.

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