Which has a bigger cup — Bach 1½C or Bob Reeves 42/M/692?

The Bach 1½C has a cup diameter of 17.00 mm / 0.6693 in compared to 16.67 mm / 0.6563 in on the Bob Reeves 42/M/692 — a difference of 0.33 mm / 0.0130 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 1½C and Bob Reeves 42/M/692?

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

Bach 1½C vs Bob Reeves 42/M/692

Name: Bob Reeves 42/M/692
Brand: Bob Reeves

The Bach 1½C 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 1½C

• Trumpet

Rim width—

Mouthpiece B

Bob Reeves 42/M/692

• Trumpet

Rim width—

Best suited for

🎵All-round versatile — balanced cup for general playing

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.