Bob Reeves 11C vs Bob Reeves 5GS
The Bob Reeves 5GS has a wider cup diameter.
Mouthpiece A
Bob Reeves 11C
• Trombone
Cup diameter24.80 mm / 0.9764 in
Cup depthShallow
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
vs
Mouthpiece B
Bob Reeves 5GS
• Trombone
Cup diameter25.55 mm / 1.0059 in
Cup depthShallow
Rim width—
Throat diameter—
Backbore—
Finish—
Material—
Cup Diameter
The Bob Reeves 5GS has a cup diameter of 25.55 mm / 1.0059 in compared to 24.80 mm / 0.9764 in on the Bob Reeves 11C — a difference of 0.75 mm / 0.0295 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a shallow 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.