Shimano vintage 3 Speed Hub 112mm Rear hub

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Hub Data
Manufacturer Shimano
Model vintage 3 Speed Hub
Position Rear
Axle Type 3/8" (9.5mm)
OLN 112 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 59 mm
Right Flange Diameter 59 mm
Left Flange Offset 25 mm
Right Flange Offset 26 mm
Mid-Flange Offset 0.5 mm (to the right)
Weight 1012 g
Hub ID 1239
Record Status Public
Created Aug 10, 2022 1:17pm
Contributed By Karl
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
8/10/2022 -- Measured a well-used hub during wheel rebuild. Axle is 3/8-26 and 153.4mm overall length. Pushrod is 108mm overall length with a 3.2mm shaft and 5.0mm head that is 1.4mm tall. Uses all-metal bell crank that threads onto the axle end and locks in place with one small locknut. Plastic oil port is roughly centered between flanges opposite the stamped markings that say "SHIMANO 3speedHUB USA PAT 3021728" Weight of 1012g is with all axle hardware, pushrod, bell crank, and snapring, but no cog. -Karl