Detail 01
The 20 diameter
The widest number Schilke lists. On the Heavyweight version it measures .700 inch (17.78mm), against .670 inch for the 14.

Independent shopping perspective
The widest mouthpiece in Schilke's numbered line, on the standard blank. For developed embouchures that can drive a large cup diameter.

Strong match
Consider the trade-offs
What matters in use
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 01
The widest number Schilke lists. On the Heavyweight version it measures .700 inch (17.78mm), against .670 inch for the 14.
Detail 02
More lip vibrating inside the cup. More sound available, and more physical work to produce it.
Detail 03
Plain-numbered models carry standard rim, cup and backbore — not a shallow A cup or a semi-flat 4 rim.
Detail 04
The wider of Schilke's two throat sizes. Freer blowing than the 27 used on the tight-backbore lead pieces.
Detail 05
This size was the founder's personal choice, which tells you it's a working player's piece, not one you grow into.
Detail 06
The lighter body. Same cup dimensions as the Heavyweight 20, roughly $50 less.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
On the Heavyweight versions, .700 inch against .670 inch — about three-quarters of a millimetre more diameter. That is a large jump in how much lip sits inside the cup.
No. It's described for the robust embouchure. The 13 is the student and developing-player size — rounder number 3 rim, quicker response, easier flexibility.
Plain-numbered Schilke models use standard rim, cup and backbore. The letters mark variations, like the shallow A cup and tight a-backbore on the 14A4a.
Only if you can support it. A larger cup offers more volume of sound, but if endurance drops your tone gets worse, not better.
Reference
The complete catalog record, organized around the decisions musicians make when comparing gear.