Over All Rating Reviews :
And then I tried riding the bike and encountered a serious problem. Whenever I tried to increase the resistance to even a mildly strenuous level the flywheel squealed terribly; worse yet, even when I tried to continue pedaling over the noise, it would simply lock up. I think this is because the bike uses cantilevers and pads with dense fabric instead of magnetic resistance. In other words, when one turns the resistance knob the pads press against the flywheel, sort of like brake pads on a bike. I believe that the friction between the flywheel caused both the squealing and vibration that caused the resistance knob to rattle, thereby tightening the pads inadvertently.
Needless to say, this was a source of great frustration and I tried all sorts of adjustments to the resistance knob, the cantilevers, and so on with no luck. I was VERY disappointed by the bike because I thought it was basically going to end up as a very expensive clothes horse. But I finally decided to try smearing each side of the rim of the flywheel with lubricant to reduce friction, not knowing what effect it would have on the material that covers the resistance pads.
Long story short, this seems to have done the trick and now the bike works beautifully. I'm pretty active--mountain biking, in-line skating, martial arts--and it looks like the Sunny Pro will provide strenuous indoor workouts for a long time to come. I really do think it's on par with much more expensive machines. Time will tell.
For now, though, I'm giving it four stars because of the frustration I experienced initially. The solution I came upon may seem pretty obvious but it wasn't included in the directions or in other posts so I thought I would share it. It's made the bike functional instead of completely useless.
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