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Bach 1¼G vs Bach 30CB

The Bach 30CB has a wider cup diameter.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
    Bach 1¼G
    • Trombone
    Cup diameter27.50 mm / 1.0827 in
    Best suited for
    🎻Orchestral playing — large cup for full, dark tone
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Bach 30CB
      • Trombone
      Cup diameter30.00 mm / 1.1811 in
      Best suited for
      🎻Orchestral playing — large cup for full, dark tone

      Cup Diameter

      The Bach 30CB has a cup diameter of 30.00 mm / 1.1811 in compared to 27.50 mm / 1.0827 in on the Bach 1¼G — a difference of 2.50 mm / 0.0984 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.

      Open in interactive tool + Add third mouthpiece Bach 1¼G details Bach 30CB details Bach 1¼G equivalents Bach 30CB equivalents

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