In only her second road race, Stigger was able to go clear from the peloton and then beat her breakaway companions Marie Le Net (France), Simon Boilard (Canada) and Barbars Malcotti (Italy) at the line.
But Stigger put in a big dig on the early gradients of Igls, followed by Malcotti and Boilard.
Stigger was able to dip past Le Net to take her second rainbow jersey in a month.
Speaking after the stage, the young Austrian said: “It’s incredible to win in my hometown.
The best placed British rider was 11th place Pfeiffer Georgi, who was 1-51 down on the leader.
World Championship women junior’s road race
Austria’s Laura Stigger came out on top of a four-woman sprint to win the junior World Championship road race in Innsbruck.
How it happened
The Russian squad drove hard on the front during the Gnadenwald climb and decimated the peloton.
“This morning I didn’t believe I had any chance of winning because it’s only my second road race.
“It’s unbelievable.”
Result
1. Laura Stigger (AUS), in 1-56-26
2. Marie Le Net (FRA)
3. Simone Boilard (CAN)
4. Barbara Malcotti (ITA)
5. Jade Wiel (FRA), at 14 seconds
6. Vittoria Guazzini (ITA)
7. Camilla Alessio (ITA), at 29 seconds
8. Aigul Gareeva (RUS), at 56 seconds
9. Mie Saabye (DEN)
10. Maina Galand (FRAN)
Mountain biker Stigger takes home the road rainbow jersey after winning the junior cross country title earlier this month.
With 15km left to ride that trio had almost 30 seconds at the crest of the climb.
Le Net was the only rider left strong enough to bridge over to the Stigger group out front, setting the scene for the four-up sprint at the line.
“It’s a very tight victory. My legs were burning in the sprint.
“I just wanted to have fun and now I’m the world champion.
Team-mate Elynor Backstedt came in 30th, almost five minutes down.
>>>UCI Road World Championships 2018: dates, route, where to watch and more
“Thanks to the people for standing on the course and cheering me on.
The junior women battled it out over a 70km route with some stiff climbs built in, including Gnadenwald and Igls.
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