There are many factors whose resistance you have to overcome when pedaling a bicycle outdoors: Aerodynamic drag, gravity, rolling resistance (from the tires and innertubes on the riding surface), and mechanical resistance of the drivetrain (chainrings, chain, rear cassette, and rear derailleur pully wheels). Fortunately, Stages makes all the tools you need: With recently in-stock Shimano 105 left side power meter, you can train even better to overcome these. For more information on training and power to weight, check out the latest blog at the link in our bio.