SHIMANO - Dynamo Hub - Disc Brake - 3.0W - CENTER LOCK - Quick Release - 16-28 inch Wheel Size The DH-3D37-QR dynamo hub uses a quick release type axle, 100mm O.L.D. spacing, and 36 spoke holes. The hub has a CENTER LOCK disc brake mount, produces 3 watts at 6 volts, and is suitable for wheel sizes from 16 to 28 inches. Product Specifications:

Model: DH-3D37-QR

Center-Lock disc brake mount

Spoke holes: 36

Voltage: 6 Volt

Power output: 3 Watt

Suitable wheel size: 16 to 28 inch (ETRTO 400 to 716)

Axle: 133 mm long quick release (QR)

Pitch circle diameter: 74 mm

Offset: 4 mm

Flange distance: 51 mm

Installation dimensions: 100 millimeters

Spoke hole size: #14

Seal: Single seal

Electrical power output connection E2-type

Weight: 650 grams