Home > Trumpet > 63 Series: .630" / 16mm


The GR 63 Series can be described as being between a Bach 7 cup diameter and a Bach 10 1/2.

With various rim contours, alpha angles, cup volumes, and backbores, the GR 63 Series has many options for players who use this popular size.
6A4a players who have issues with "bottoming out" have great success with the 63Z*, 63Z**, and 63SZ models!

Models Backbore Cup Volume Cup Volume Cup Diameter r2 r4 Rim
63 Number Description Cubic Inches Inch mm Fraction @.032" Contour Bite Alpha Angle
63Z* 1 Small .0604 0.63 16 40/64 0.639 Flat Med. - Wide Medium High
63Z** 1 Small .061 0.63 16 40/64 0.643 Flat Med. - Wide Soft High
63SZ 1 Small .0620 0.63 16 40/64 0.641 Medium Medium Medium High
63S 1 Small .064 0.63 16 40/64 0.641 Medium Medium Medium High
63MS 2 Medium Small .068 0.63 16 40/64 0.641 Medium Medium Medium High
63M 2 Medium .071 0.63 16 40/64 0.641 Medium Medium Medium High


63 Series Trumpet Mouthpiece 63Z Series Trumpet Mouthpiece