Most road bikes are 2x set-ups, which means they have two front chainrings and a front derailleur ... Much bike technology (trainers, car racks, bike stands) is still designed for rim brake ...
Endurance bikes are a bit more upright, feature more stable handling, put a premium on comfort, and may have built-in storage and mounts for racks ... front end of both the Roubaix SL8 endurance ...
Cycling is an excellent way to workout, but sometimes an outdoor cycling or spin studio session doesn't fit in with your schedule or work with the weather forecast. That's where an indoor exercise ...