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The flywheel weight is 16.9 lbs. I contacted Nautilus directly. They put me on hold long enough to pull up the engineering schematic where the ACTUAL flywheel weight was indicated. I also asked if this is the same flywheel that they use for the U616. The answer was "yes". If you go to Nautica's website they even have a Q/A section on the "reviews" link of the model page. Someone asks for clarification and even receives the wrong answer from a Nautilus rep when they asked if it as 10lb or 30lb. The answer said that both are correct when NEITHER are. Previously this model received comments of a 10lb flywheel being inadequate, so we all assumed they moved up to a 30lb flywheel based on marketing and available data from sellers. The flywheel is 16.9lbs on both the U616 and U618. The replacement cost for the flywheel is about $60 -shipping if it is out of warranty.
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