Stages SB20 - What's Inside?
![Image](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgxV2Vq2jEc2oz6v6hnGsEQGL-vEAowwYZzzsSBKFsjIMgtkWuzEBYGM8k30PZzGMAm018tFHqCcWE91Je-WdRZUcmXCgxBEJUMM13Iw4InSDdX-omy9UxCSjhQYY6tw_xUuMha_EBh-HiXWeoplbwP5WmzmwcOGu62Fv3l3VoFnEUacK_RVQkj3XGc_Uw/w679-h529/SB20%20boards.png)
The Stages SB20 indoor smart bike was released in 2020. Let's take a look at the electronics that enable it on platforms like Zwift.com and TrainerDay.com. An external power supply routes power to different bike components through a series of printed circuit boards (PCBs). The bike also includes two battery powered crank-based power meters. Here's an overview the basic functions: USB Board - Wedged vertically under the phone tray. It powers 3 USB ports. Upper Board - Fastened horizontally under the phone support rail. This System On a Chip (SoC) handles wireless communication and controls the bike itself. Switch Board - This wire distribution board sits inside the aluminum handlebar stem. It routes connections for the brake level controls and under handlebar tape "blip" shifter buttons. Lower Board - This mainly analog circuit board is attached to the flywheel / electronic brake unit. It controls bike resistance and sends power to other PCBs. Power Meters - A