From article:
Double-reduction gearing and drivetrain - The pedals are connected to a first reduction gear; that gear is connected to a low-speed pinion with one more shaft. This pinion is connected to a second reduction gear mounted directly to the back wheel.
Swag estimate from photo, 80:11 front 100: 14? to wheel??? Yes I could zoom in and count the teeth, takes too much time.
More here:
http://www.bicycling.com/news/records/badass-mom-of-three-becomes-worlds-fastest-female-cyclist
requires I turn off Ad Blocker and give them my email.........ain’t gonna