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2015年11月14日 (土)

2 Speed Internally Geared Hub (Part 1)

次回この記事の日本語版を投稿します。

This is an internally geared 2 speed hub dating back about 50 years. I plan to use this to build a 26 x 1 3/4 BE rim with #13 spokes for my light carrier Sekine.  Light carrier is a misnomer as it weighs 36 kilograms.

The beauty of this 2 speed hub is that the gearing is internal, and, moreover, it doesn't use any cables.  It is operated by pedaling backwards a third of a turn.
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Here's a breakdown diagram and instructions.
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The hub was manufactured by Yamamoto Iron Works based in Osaka.  A quick check revealed that the company was founded in 1915, 100 years ago and is still in business. 
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The hub is beautifully chromed, and, by today's standards is heavy weighing in at over 2 kilograms.!   
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It has an oil port and oil cap.  Typically these hubs were oiled every 6 months.
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Traditional 40 count spoke. 
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Spoke holes are well machined and are the "keyhole"fashion also known in Japanese as the "Daruma" fashion.
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This type of 2 speed hub where shifting is performed by pedaling backwards is known today as  "kickback"and Sturmey-Archer has a complete line-up.  But the specs are for modern-day bicycles and cannot be used on a traditional 40 spoke BE rim.

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Hi Richard-

I have several of the Chinese version of these. They look to be identical. Drop me a line if you are interested

Hi there.

Thanks for the offer, I have all I need for now but will keep your kind offer in mind. I am still in the process of building a rear wheel with this hub. I'm interested to test ride and see what gear ratio is once assembled

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