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Schilke 45B vs Schilke 51D

The Schilke 51D has a wider cup diameter, the Schilke 51D has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
Mouthpiece A
    Schilke 45B
    • Trombone
    Cup diameter24.30 mm / 0.9567 in
    Cup depthMedium
    Rim width—
    Throat diameter5.95 mm / 0.2343 in
    Backbore15/64 .2344"
    Finish—
    Material—
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Schilke 51D
      • Trombone
      Cup diameter25.55 mm / 1.0059 in
      Cup depthMedium
      Rim width—
      Throat diameter7.04 mm / 0.2772 in
      BackboreJ .277"
      Finish—
      Material—
      Best suited for
      📣High-volume projection — open throat for power

      Cup Diameter

      The Schilke 51D has a cup diameter of 25.55 mm / 1.0059 in compared to 24.30 mm / 0.9567 in on the Schilke 45B — a difference of 1.25 mm / 0.0492 in. A wider cup generally produces a fuller, darker tone but requires more air support.

      Cup Depth

      Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.

      Throat Diameter

      The Schilke 51D has a wider throat (7.04 mm / 0.2772 in vs 5.95 mm / 0.2343 in). A wider throat allows more air through, increasing volume and projection but reducing resistance.

      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 Schilke 45B details Schilke 51D details Schilke 45B equivalents Schilke 51D equivalents

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