|1970||Daniel Morelon||48×14||7.32 metres|
|1999||Florian Rousseau||49×14||7.47 metres|
|2001||Arnaud Tournant||50×14||7.62 metres|
|2011||Kévin Sireau||52×13||8.54 metres|
Note the gradual progress of an additional tooth on the chainring until you get to Sireau who adds two teeth, plus the game-changing 13T sprocket on the back. Sireau also uses 172.5mm cranks.
But the change isn’t due to Sireau and the French team. “In 2006, after having filmed the English [sic] we understood they were using a bigger gear than us” track coach Gérard Quintyn told Vélo Magazine.