单动力还是双轮驱动？看看为什么双驱动系统为Fiona Petersen工作

Fiona is an MTB fanatic who rides a double drivetrain. She meets up weekly with a group of guys to go biking. With this hardcore group she does a lot of steep climbs and technical downhills. Fiona prefers the double drivetrain because she wants to save as much energy as she can on the climbs. Watch her video and discover why the double is her ultimate setup. drivetrainadvice.shimano.com/global/en