Saris M2
If you’re looking to get into a virtual training environment like Zwift or Sufferfest while reaping all of the benefits of training with power and virtual feedback, the M2 is one of the best budget options to get you started.
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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.
$500, Saris.com