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Bach 12C vs Schilke 51B

The Schilke 51B has a wider cup diameter, the Schilke 51B features a deeper cup, the Schilke 51B has a larger throat opening.

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 12C
    • Trombone
    Cup diameter24.50 mm / 0.9646 in
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Schilke 51B
      • Trombone
      Cup diameter25.63 mm / 1.0091 in
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Schilke 51B has a cup diameter of 25.63 mm / 1.0091 in compared to 24.50 mm / 0.9646 in on the Bach 12C — a difference of 1.13 mm / 0.0445 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 12C details Schilke 51B details Bach 12C equivalents Schilke 51B equivalents

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