One-day races and Classics Léon Scieur (pronounced [le.ɔ̃ sjœʁ]; 19 March 1888 – 7 October 1969) was a Belgian cyclist who won the 1921 Tour de France, along with stages 3 and 10.

He began work as a glassmaker[2] before being introduced to cycling by his neighbour, Firmin Lambot, who taught him to ride a bike at the age of 22.

After working as a mechanic in World War I[2] Scieur rode the revived Tour de France in 1919 placing in fourth.

He asked the woman to help but the chief official, Lucien Cazalis, told him: "It's forbidden to receive help; you'll be penalised if madame threads the needle for you."

[4] He went into the lead on the second day and rode so hard to defend his position that reporters nicknamed him The Locomotive[2][5][7] He pedalled fast on a low gear,[5] winning won two stages, from Cherbourg to Brest and from Nice to Grenoble.

[8] Scieur was so angry at the breach of etiquette that riders weren't attacked when they had mechanical trouble[6] that he set off after Heusghem, lectured him on politeness and tradition, raced off angrily alone and won the stage to Grenoble.

Two Belgians, Firmin Lambot and Louis Mottiat, stayed in the main group rather than chase and spoil Scieur's chances.