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What’s the difference between magnetic and friction resistance on a bike?

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a. Magnetic resistance uses magnets that oppose the polarity in the flywheel. As the flywheel spins, the magnets create “drag” without any friction. As the magnets move closer to the flywheel, more resistance is created. 

b. Friction resistance is created by an adjustable lever and felt pad that presses against the flywheel to produce “drag.”  As you increase resistance, the pad presses down harder against the flywheel. A few caveats with friction resistance include the fact that it can be noisy, isn’t precisely measurable - therefore you lack digital resistance levels, and the pad can wear out over time. It is typically less expensive however. 

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