Which has a bigger cup — Bach 1¼G or Bach 30CB?

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.

How does cup depth compare between Bach 1¼G and Bach 30CB?

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

Bach 1¼G vs Bach 30CB

Name: Bach 30CB
Brand: Bach

The Bach 30CB has a wider cup diameter.

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 1¼G

• Trombone

Rim width—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📣High-volume projection — open throat for power

Mouthpiece B

Bach 30CB

• Trombone

Rim width—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

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.