1957 Giro d'Italia|
| Dates | 18 May - 9 June 1957 |
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| Stages | 21 |
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| Distance | 3,926.7 km (2,440 mi) |
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| Winning time | 104h 45' 06" |
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The 1957 Giro d'Italia was the 40th running of the Giro d'Italia, one of cycling's Grand Tour races. The Giro started in Milan, on 18 May, with a 191 km (118.7 mi) stage and concluded in Milan, on 9 June, with a 257 km (159.7 mi) leg. A total of 120 riders from 15 teams entered the 21-stage race, which was won by Italian Gastone Nencini of the Leo-Chlorodont team. The second and third places were taken by Frenchman Louison Bobet and Italian Ercole Baldini, respectively.