Exercise bikes: upright, recumbent or spin — pick the posture, then the resistance

Which style fits the rider, why magnetic resistance beats friction, what flywheel weight actually does, and the fit adjustments that decide whether it gets used.

Three kinds of bike, three kinds of rider. Decide the posture first; it's the thing you can't change later.

Posture

• Upright: compact, sits like a regular bike, moderate intensity. The default for general fitness.
• Recumbent: bucket seat, back support, low step-through. The choice for bad backs, bad knees, rehab and long easy sessions. Largest footprint.
• Spin / indoor cycling: road-bike position, heavy flywheel, built for hard intervals and class-style training. Least comfortable for casual use.

Resistance

Magnetic resistance is silent, wears nothing and adjusts precisely; it's the right answer at any price now. Friction (felt pad on the flywheel) is cheaper, noisier and needs replacement pads. Air resistance (fan bikes) scales with effort and is a different, harder workout.

Flywheel

Heavier flywheels (30–40 lb on spin bikes) smooth the pedal stroke; on magnetic bikes the gearing matters as much as the mass, so a lighter flywheel with a good drive can feel just as smooth. Don't buy on flywheel weight alone.

Fit

• Seat height and fore/aft, and handlebar height — four-way adjustment on both is what lets two people share a bike.
• Inseam range stated by the maker vs. the riders'.
• Pedals: cages for sneakers, SPD clips for cycling shoes, or dual-sided.
• Q-factor (pedal spacing) if you have knee issues — narrower is closer to a road bike.

What to check

• Weight capacity and a frame that doesn't rock at full effort.
• Belt drive over chain for quiet.
• Console honesty: power (watts) readings are accurate on a few bikes and decorative on most; Bluetooth to a training app is the useful feature.
• Transport wheels and the footprint with the seat back.

Ignore, mostly

Screen size and bundled subscriptions, "calories burned" accuracy claims, and number of preset programs.

Today's prices

Every seller we found, ranked by total price: exercise bike.

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