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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
|
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