Which has a bigger cup — GR Technologies G66FD Radtke or GR Technologies 67FD?

The GR Technologies 67FD has a cup diameter of 17.00 mm / 0.6693 in compared to 16.76 mm / 0.6598 in on the GR Technologies G66FD Radtke — a difference of 0.24 mm / 0.0094 in. A wider cup generally produces a fuller, darker tone but requires more air support.

GR Technologies G66FD Radtke vs GR Technologies 67FD

Name: GR Technologies 67FD
Brand: GR Technologies

The GR Technologies 67FD has a wider cup diameter.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material

How deep the cup is, from shallow (brighter, easier high register) to deep (darker, fuller sound).

Mouthpiece A

GR Technologies G66FD Radtke

• Flugelhorn

Cup depthDeep

Mouthpiece B

GR Technologies 67FD

• Flugelhorn

Cup depthDeep

Best suited for

🎻Orchestral playing — large cup for full, dark tone

Cup Depth

Both mouthpieces share a deep cup depth, so the sound character from depth alone will be very similar.

Which is better?

Neither mouthpiece clearly dominates the other — the right choice depends on your embouchure, playing style, and the sound you're after. Try both if possible.

Open in interactive tool + Add third mouthpiece GR Technologies G66FD Radtke details GR Technologies 67FD details GR Technologies G66FD Radtke equivalents GR Technologies 67FD equivalents

GR Technologies G66FD Radtke vs GR Technologies 67FD

Cup Depth

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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Compare GR Technologies 67FD with others

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