A Clear Case of Trading with the Enemy (2015)
greatwarproject.org
greatwarproject.org
WWI started almost by mistake. It rapidly got out of hand. All the major countries now had machine guns, artillery, railroads, and steel mills. This was an industrial strength war. It started with calvary and ended with tanks. That was new. The level of destruction was much higher than in past wars. This was the first war where there was more than enough ammo, and enough machine guns and artillery to use it. France is still cleaning up unexploded ordnance from WWI.
It's important today to understand how Europe worked before WWI today, because that's Putin's view of the world - Great Powers engaged in ongoing power struggles and land grabs. Hence Georgia, Crimea, and Ukraine. We're used to a comfortable superpower stalemate, which we've had since the atomic bomb in 1945. That may not last.
For the US, the decades of assorted coups, intrigue, proxy wars, military adventures, tinpot middle eastern dictators, oil crises, war on terror, drone strikes etc mostly happen somewhere off in another comfortably remote hemisphere, with US involvement small and limited to people who signed up for the job.
From the other side, all this stuff is happening near your country's borders and potentially affecting your conscripted kids. It's like the Cuban missile crisis ALL THE TIME. It's not "comfortable" at all.
- Truck spring wheel: http://encyclopedia.1914-1918-online.net/smw/images/thumb/a/...
- Bicycle spring wheel: http://www.oldbike.eu/museum/wp-content/uploads/2014/05/WW1-...
In regular environments (see: driving on paved road) they actively work against speed by reducing road contact due to tread gaps. That's why racing vehicles use smooth wheels:
http://www.theautochannel.com/news/2009/01/26/388620.1-lg.jp...
http://www.slowtwitch.com/articles/images/6/75576-largest_MI...
Plus most cars were still using slick (smooth) tires up until around the 1940s-1960s and (I don't believe) were fast enough to have a threat of hydroplaning.
ETA: Just remembered you were talking about the bike. Considering the background, it looks like it was used on dirt roads so if ever mud happened to be in the way, one could just carry the bike over. Dirt roads also don't usually require too much turning and are fairly sturdy, so there's little reason to believe skidding was a common problem.
Even if it were for sidewalk/road riding, you can easily get out of the way of puddles and slow down easier than cars.
The British and Germans traded a lot prior to both wars, which is worry for the argument that the trade links between the US and China will prevent a future war.