Trumpet Mouthpiece Size Chart: Sizes in mm & Inches

Syos trumpet mouthpieces come in two rim inner diameters: 16.3 mm (0.642 in), the diameter of a Bach 3, and 17 mm (0.669 in), the diameter of a Bach 1½. Choose the one closest to the mouthpiece you play now, then pick your cup.

For custom trumpet mouthpieces, we can make any diameter you need.

Find your diameter

Select your brand and your model. The tool tells you which Syos diameter is closest to yours, and by how many millimetres.

Cup diameter match

Find your cup diameter

Every Syos Originals trumpet mouthpiece comes in two cup diameters, 16.3 mm and 17 mm. Pick the mouthpiece you play today and we will show you which size feels the same.

I currently play

You play mm

SYOS Originals mm

Your SYOS size

All equivalents

See every mouthpiece and its gap

Brand	Model(s)	Diameter	Inches	SYOS size	Gap

Competitor cup diameters are indicative values based on manufacturer data and may vary slightly between production years. A negative gap means your mouthpiece is smaller than the SYOS size, a positive gap means it is larger. Bach, Yamaha, Schilke, Denis Wick and Monette are trademarks of their respective owners, cited for comparison only.

The SYOS trumpet range

Choose your sound

Your lips feel the cup diameter, your sound comes from the cup shape. Keep the size you know and choose the sound you're after.