Bests & Worsts Reviews from Amazon

My wife loved the bike for about two weeks. Then she felt a periodic inconsistency in resistance related to her pedaling speed. A corresponding noise became increasingly annoying. At her request I opened it up and found that the flywheel axle pulley had been over-tightened during assembly causing damage to the ball bearings. The normally sealed bearing was crushed and the balls were falling out. While design is a factor, incorrect assembly is the greater culprit. I speculate that the other reviewers that have mentioned inconsistent pedal resistance have the same problem. I registered the product today on [...] and will be seeking a replacement part. These parts are all internal to the "Main frame" so I'm uncertain as to whether I'll receive just the bearing or an entire main frame. I will update this post with their response. Update: I apologize for the delayed response. I did get it fixed. I called the company and reported the problem and within days they sent me a new flywheel (magnetic resistance wheel) that included a new axle and bearings. I noticed that it was missing the appropriate washers (same as the original) to protect the axle bearing so it would have caused a similar problem again. I used one washer from the old axle and changed the assembly order. I called back their tech support and reported my findings and they were very gracious and said they would get immediate word to the factory. After installing the flywheel appropriately, it has given many hours of good service. My wife has thoroughly enjoyed it. That said, I couldn't recommend the product until I knew that the factory had corrected their assembly procedures.