Need makes inventiveness
In WW1 there was no more rubber. The people still wanted to ride bicycles. The alternative shown here was eagerly used so as to still be mobile. Bicycles were in Germany at the time of WW1 very popular. This conversion set was made in factories and sold in big quantities.
Today this type of tire has become extremely rare. On untared field paths this principle works without problems. On asphalt, cobblestones or similar, less so."
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