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Bach 1¼G vs Bach 4G

The Bach 1¼G 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 4G
      • Trombone
      Cup diameter26.00 mm / 1.0236 in
      Best suited for
      🎻Orchestral playing — large cup for full, dark tone
      📣High-volume projection — open throat for power

      Cup Diameter

      The Bach 1¼G has a cup diameter of 27.50 mm / 1.0827 in compared to 26.00 mm / 1.0236 in on the Bach 4G — a difference of 1.50 mm / 0.0591 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 4G details Bach 1¼G equivalents Bach 4G equivalents

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