Shimano Nexus Inter-3 SG-3R40 120mm Rear hub

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Hub Data
Manufacturer Shimano
Model Nexus Inter-3 SG-3R40
Position Rear
Axle Type 3/8" (9.5mm)
OLN 120 mm
Spoke Interface Type J-Bend
Brake Compatibility rim brake
Drive Interface single cog driver
Internal Gearing 3 speed
Dynamo Type none
Spoke Hole Diameter 2.8 mm
Left Flange Diameter 74 mm
Right Flange Diameter 74 mm
Left Flange Offset 24.5 mm
Right Flange Offset 24.5 mm
Mid-Flange Offset 0 mm (centered)
Weight 0 g
Hub ID 226
Record Status Public
Created Mar 20, 2012 10:36am
hub dimension diagram
PLEASE NOTE: Shimano publishes hub dimensions in a relatively confusing manner on They seem to provide the outside-to-outside flange spacing, and an overall offset of the flanges as a whole. Wheelbuilders are interested in the distance from the midpoint between locknut faces to the middle of the flange (not the inside or outside face). When necessary, I convert Shimano's data into useful spoke calculation dimensions with some simple arithmetic, and factor in 3mm thick hub flanges (an approximation). The formula is to divide spacing by two, add or subtract the overall offset, then subtract half of our assumed 3mm flange thickness. Please check the notes to see if the values for this part are derived from Shimano's published data or actual measurements of a hub specimen. -Karl
6/2/16 -- Stock rear hub on Linus 3-speeds. -Karl