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Again, costing less than half of most of the “wheel-off” options for smart trainers, the Saris M2 uses magnets to adjust the resistance to your wheel up to a claimed 1500 Watts and 15% grade. Even when not used in virtual training mode, the M2 can still be used with a power curve that mimics a fluid trainer.
Easily foldable for storage when not in use, the Saris M2 has a moderate amount of power accuracy (+/- 5%, while most higher-end offerings are usually in the +/-2% range) and Bluetooth/ANT+ FE-C compatibility. But do bear in mind that while most computers/smartphones have Bluetooth built in, this trainer does not include an ANT+ dongle and may need to be purchased separately. On the other hand, internally built-in speed, cadence, and power sensors mean no extra accessories.