Which has a bigger cup — Bach 18 or Schilke 66?

The Bach 18 has a cup diameter of 32.10 mm / 1.2638 in compared to 31.52 mm / 1.2409 in on the Schilke 66 — a difference of 0.58 mm / 0.0228 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 18 and Schilke 66?

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

Bach 18 vs Schilke 66

Name: Schilke 66
Brand: Schilke

The Bach 18 has a wider cup diameter, the Bach 18 has a larger throat opening.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material

The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.

Mouthpiece A

Bach 18

• Tuba

Rim width—

Best suited for

📣High-volume projection — open throat for power

Mouthpiece B

Schilke 66

• Tuba

Rim width—

Best suited for

📣High-volume projection — open throat for power

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.