Shimano Alfine DH-S501 and DH-3D72 100mm Front hub

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Hub Data
Manufacturer Shimano
Model Alfine DH-S501 and DH-3D72
Position Front
Axle Type 9mm
OLN 100 mm
Spoke Interface Type J-Bend
Brake Compatibility disc, Centerlock
Drive Interface n/a (front)
Internal Gearing none
Dynamo Type 6v 3w (26"-29")
Spoke Hole Diameter 2.6 mm
Left Flange Diameter 70 mm
Right Flange Diameter 70 mm
Left Flange Offset 20 mm
Right Flange Offset 28.5 mm
Mid-Flange Offset 4.3 mm (to the right)
Weight 0 g
Hub ID 278
Record Status Public
Created Nov 4, 2014 5:53am
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
11/4/14 -- measured for a PG wheelbuild. -Karl
12/1/15 -- Measures the same as a DH-3D72. -Karl