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Shimano DH-3D37QR 6v 3.0w Centre Lock Disc Dynamo Front Hub - Silver - 36 Hole

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Questions & Answers (1) Q & A
This robust dynamo from Shimano offers excellent reliability and the option to use a disc braking system.
· aluminium coil construction
· Center Lock disc brake mount
· material: Varnished aluminium
· suitable for all dynamo-operated 6 V lighting systems
· 26" - 29" wheel size
· 6 volt, 3 watt
· hub width: 100 mm
· weight: approx. 650 g (without quick release)
· incl. quick release, connector and SM-DH10 overvoltage protection

Supplied with rubber cover if not being used with disc brakes.
To prevent your lights from burning constantly, you need a front light with a switch!
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Questions & Answers (1)
Open Circuit
14 Jun 2017
Can these hubs run open-circuit without damaging them?

I'm assuming by open circuit you mean without anything plugged into them, if so then yes this is possible. It will not damage the hub and will actually improve the rolling resistance of the hub as there will be no power being drawn by the magnets.