That's funny, it certainly appears that he rides touring bikes, custom heavy-duty ones at that:

http://www.bikechina.com/heinzstucke1z.html

"Now about my bicycle. I have met a lot of bicycle enthusiasts who asked many questions about speeds, gear ratio, the weight of equipment carried, the height of the saddle, handlebars and many other technical things that I have never thought very much about. Some will probably shake their heads in disbelief over some of the figures I give, but what I wanted was a strong, reliable cycle which needed as little maintenance and repair as possible. The cycle was given to me by a bicycle company in Germany. It weighs about 25 kgs because it has a reinforced frame, thick spokes and solid luggage-carriers. I insisted on these things because on earlier tours I had always had trouble with broken spokes and broken carriers, etc. Imagine a broken frame in the middle of the desert! The bicycle has 26" wheels and a three-speed Torpedo hub-gear (incorporating pedal brake). I never felt that the three speeds were insufficient and I am happy with the little service the Torpedo has required. As of today I have pedalled about 385,000 kms."





He more recently switched to a Bike Friday Pocket Llama, a bike the manufacturer characterizes as their "expedition touring" model. He needed a folder to easily fit into boats/planes for the island-hopping he planned to do to complete the last 5% of countries he toured.

https://www.bikefriday.com/community/stucke



BTW - DT hubs do not have loose ball bearings, they use cartridge bearings, since at least 2004.