Bob Reeves Piccolo 42/M/692sL vs GR Technologies G66**
The GR Technologies G66** has a wider cup diameter.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bob Reeves Piccolo 42/M/692sL
• Trumpet
Cup diameter16.67 mm / 0.6563 in
Best suited for
All-round versatile — balanced cup for general playing
vs
Mouthpiece B
GR Technologies G66**
• Trumpet
Cup diameter16.76 mm / 0.6598 in
Cup Diameter
The GR Technologies G66** has a cup diameter of 16.76 mm / 0.6598 in compared to 16.67 mm / 0.6563 in on the Bob Reeves Piccolo 42/M/692sL — a difference of 0.09 mm / 0.0035 in. A wider cup generally produces a fuller, darker tone but requires more air support.
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.