Until the 1980s, most derailleur chains were also bushing chains, but today, virtually all derailleur chains are of the "Sedis" bushingless design.
His freewheel broke in the Pyrenees and he could no longer turn the wheel - in the absence of a derailleur, which Desgrange had also banned - to ride a lower gear.
Road bicycle - 10-speed is a 1970s American term describing road racing bicycles (using a derailleur) with 10 total gearing combinations, or speeds.