Yamaha TR-16C4 vs Yamaha TR-18C4
The Yamaha TR-18C4 has a wider cup diameter.
Mouthpiece A
Yamaha TR-16C4
• Trumpet
Cup diameter17.00 mm / 0.6693 in
Cup depthMedium
Rim width—
Throat diameter3.65 mm / 0.1437 in
BackboreSemi-narrow
Finish—
Material—
vs
Mouthpiece B
Yamaha TR-18C4
• Trumpet
Cup diameter17.42 mm / 0.6858 in
Cup depthMedium
Rim width—
Throat diameter3.65 mm / 0.1437 in
BackboreSemi-narrow
Finish—
Material—
Cup Diameter
The Yamaha TR-18C4 has a cup diameter of 17.42 mm / 0.6858 in compared to 17.00 mm / 0.6693 in on the Yamaha TR-16C4 — a difference of 0.42 mm / 0.0165 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
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.