Shimano Nexus NX-30 Dynohub 100mm Front hub

Add this hub to your bench

Hub Data
Manufacturer Shimano
Model Nexus NX-30 Dynohub
Descriptor discontinued model
Position Front
Axle Type 9mm
OLN 100 mm
Brake Compatibility rim brake
Drive Interface n/a (front)
Internal Gearing none
Dynamo Type 6v 3w (26"-29")
Spoke Hole Diameter 2.5 mm
Left Flange Diameter 80 mm
Right Flange Diameter 80 mm
Left Flange Offset 28 mm
Right Flange Offset 28 mm
Mid-Flange Offset 0 mm (centered)
Weight 0 g
Hub ID 189
Record Status Public
Created Mar 19, 2010 1:28pm
Contributed By
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

It's listed here to help avoid confusion among other models still made by Shimano.

Info from Peter White Cycles:
"Drag with the Nexus is higher than with the more expensive Schmidt hub. In fact, at most speeds the Nexus has higher drag when its light is turned off than the Schmidt has when its light is turned on. You get what you pay for. But the drag is less than with the Busch&Müller Dymotec 6 sidewall generator when the light is turned on. Because the hub also has some drag even with the light off, I don't recommend it for longer events such as brevets and long tours. For touring, the Dymotec sidewall dynamo would be a better choice, since in daylight, with the light off and the dynamo disengaged, there is zero drag, and most people don't tour by bicycle in winter, when snow will cause a sidewall dynamo to slip. Drag with the Schmidt hub is so low with the light off that it isn't an issue."