3 ms·

Because everything before "safety bike" was bloody dangerous. "Safety bike" requires precise racks, chains, and rubber (so industrial oil refineries must exist)

• lostlogin 6y ago
  > so industrial oil refineries must exist Rubber bike tyres were patented in 1868, with decent ones in 1887. Synthetic rubber was invented in 1909. https://en.m.wikipedia.org/wiki/Bicycle_tire https://en.m.wikipedia.org/wiki/Bicycle_tire https://en.m.wikipedia.org/wiki/Synthetic_rubber https://en.m.wikipedia.org/wiki/Synthetic_rubber