The words "smart bike", "indoor cycle" and "exercise bike" are often mixed up. They are different kinds of machine.
Indoor cycle
An indoor cycle (sometimes called a spin bike or studio cycle) has a weighted flywheel and a resistance knob or lever, and a seat and handlebars you can adjust. It is the style of bike used in studio classes. Many show speed, time and cadence on a console, and some report power or connect by Bluetooth to a phone or app.
Smart bike
A smart bike controls its own resistance electronically. An app or the bike's software can change the resistance for you, for example to follow a structured workout or a virtual route. Smart bikes normally measure power directly and need a mains power supply. Some apps need their own membership, so check what the app you want to use requires.
Exercise bike
Upright exercise bikes sit like a normal bike. Recumbent bikes have a reclined seat with a back support and pedals out in front. Both usually have a console with preset programmes.
Which to compare
- Resistance: manual (knob or lever), magnetic, or electronically controlled.
- Data: which figures it displays and whether it records power.
- Connections: Bluetooth or ANT+, and which apps it supports.
- Power: whether it needs a mains supply or is self-powered.
- Fit: the seat and handlebar adjustment range and the maximum user weight.
Each product page lists these details when the manufacturer publishes them.