Which has a bigger cup — Bach 3C or GR Technologies 67M?

The GR Technologies 67M has a cup diameter of 17.00 mm / 0.6693 in compared to 16.30 mm / 0.6417 in on the Bach 3C — a difference of 0.70 mm / 0.0276 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 3C and GR Technologies 67M?

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

Bach 3C vs GR Technologies 67M

Name: GR Technologies 67M
Brand: GR Technologies

The GR Technologies 67M has a wider cup diameter.

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

The taper behind the throat leading to the shank. Affects projection and tone character.

Mouthpiece A

Bach 3C

• Trumpet

Backbore—

Best suited for

🎵All-round versatile — balanced cup for general playing

Mouthpiece B

GR Technologies 67M

• Trumpet

Backbore—

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.