Yamaha TR-11B4-GP vs Yamaha TR-13B4
The Yamaha TR-13B4 has a wider cup diameter.
Mouthpiece A
Yamaha TR-11B4-GP
• Trumpet
Cup diameter16.46 mm / 0.6480 in
Cup depthShallow
Rim width—
Throat diameter3.65 mm / 0.1437 in
BackboreSemi-narrow
Finish—
Material—
vs
Mouthpiece B
Yamaha TR-13B4
• Trumpet
Cup diameter16.63 mm / 0.6547 in
Cup depthShallow
Rim width—
Throat diameter3.65 mm / 0.1437 in
BackboreSemi-narrow
Finish—
Material—
Cup Diameter
The Yamaha TR-13B4 has a cup diameter of 16.63 mm / 0.6547 in compared to 16.46 mm / 0.6480 in on the Yamaha TR-11B4-GP — a difference of 0.17 mm / 0.0067 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Cup Depth
Both mouthpieces share a shallow cup depth, so the sound character from depth alone will be very similar.
Throat Diameter
Throat diameters are essentially identical at 3.65 mm / 0.1437 in, so resistance feel will be comparable.
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.