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Spoke-to-Bulkhead Clearances
(If the wheel pulley mounts to a wood ring on a wood wheel, or to spoke spacers, use the clearance from the wood ring or
from the spoke spacers when using the charts below)
Full Bulkhead Mount Clearance Chart
Clearance Shim Thickness
2.25ʺ (57mm) 0.75ʺ shim (19mm)
2.375ʺ (60mm) 0.875ʺ shim (22mm)
2.5ʺ (64mm) 1ʺ shim (25mm)
2.625ʺ (67mm) 1.125ʺ shim (29mm)
2.75ʺ (70mm) 1.25ʺ shim (32mm)
2.875ʺ (73mm) 1.375ʺ shim (35mm)
3ʺ (76mm) 1.5ʺ shim (38mm)
3.125ʺ (79mm) 1.625ʺ shim (41mm)
3.25ʺ (83mm) 1.75ʺ shim (44mm)
3.375ʺ (86mm) 1.875ʺ shim (48mm)
3.5ʺ (89mm) 2ʺ shim (51mm)
3.625ʺ (92mm) 2.125ʺ shim (54mm)
3.75ʺ (95mm) 2.25ʺ shim (57mm)
3.875ʺ (98mm) 2.375ʺ shim (60mm)
4ʺ (102mm) 2.5ʺ shim (64mm)
Partial Bulkhead Mount Clearance Chart
(clutch extends past bulkhead starboard corner)
Clearance Shim Thickness
1.5ʺ (38mm)
no shim
1.625ʺ (41mm) 0.125ʺ shim (3mm)
1.75ʺ (44mm) 0.25ʺ shim (6mm)
1.875ʺ (48mm) 0.375ʺ shim (10mm)
2ʺ (51mm) 0.5ʺ shim (13mm)
2.125ʺ (54mm) 0.625ʺ shim (16mm)
2.25ʺ (57mm) 0.75ʺ shim (19mm)
(refer to Full Bulkhead Mount chart for larger values)
Shims thicker than 2.5ʺ are not advised due to the long
bolts required. We recommend fastening a 2ʺ backing
block to the bulkhead and attaching a thinner shim to
that in order to get the necessary clearance. See diagram
at right.
Clearance Backing Block + Shim Thickness
4.125ʺ (105mm) 2ʺ + 0.625ʺ shim (51 + 16mm)
4.25ʺ (108mm) 2ʺ + 0.75ʺ shim (51 + 19mm)
4.375ʺ (111mm) 2ʺ + 0.875ʺ shim (51 + 22mm)
4.5ʺ (114mm) 2ʺ + 1ʺ shim (51 + 25mm)
4.625ʺ (117mm) 2ʺ + 1.125ʺ shim (51 + 29mm)
4.75ʺ (121mm) 2ʺ + 1.25ʺ shim (51 + 32mm)
4.875ʺ (124mm) 2ʺ + 1.375ʺ shim (51 + 35mm)
5ʺ (127mm) 2.5ʺ + 1ʺ shim (64 + 25mm)
3"
2"
2"
Use #10 screws
(#7 or 3/16ʺ drill size)
Shim Dimensions
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