Bob Reeves 4G-5G vs Schilke 45B
The Bob Reeves 4G-5G has a wider cup diameter, the Bob Reeves 4G-5G features a deeper cup.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Bob Reeves 4G-5G
• Trombone
Cup diameter26.00 mm / 1.0236 in
Best suited for
Orchestral playing — large cup for full, dark tone
vs
Mouthpiece B
Schilke 45B
• Trombone
Cup diameter24.30 mm / 0.9567 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Bob Reeves 4G-5G has a cup diameter of 26.00 mm / 1.0236 in compared to 24.30 mm / 0.9567 in on the Schilke 45B — a difference of 1.70 mm / 0.0669 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.
Compare Bob Reeves 4G-5G with others
Compare Schilke 45B with others
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