I ordered two of these bikes; one for me and one for my wife. The bikes arrived and upon putting one together, I noticed many small "bubbles" on both sides of the flywheel and especially on the part that makes contact with the pads. I felt this was just cosmetic defects and did not bother me that much. However, after a few days of use of the other bike, the cranks were noticeably loose. I could take my fingers and move the cranks up and down at least a half inch. Also, the bike became noisy on the down strokes of each crank. In addition, on the bike with the bubbles, the pads became very noisy when climbing. I called Sunny Health with these issues. The person tells me to remove the round plastic tab off the crank where it attaches to the bottom bracket and tighten up the nut. The person says they will send me a new crank if needed. I mentioned the bubbles on the other bike and the Sunny representative says this is certainly more cosmetic, but my pads may wear out quicker. I take the plastic tabs off both sides of the bike and the nut is very tight. I conclude there must be something wrong with the bottom bracket. I also email Sunny Health and they respond saying "Please let us know if you will be needing any replacement parts, or any troubleshooting instructions." I also gave my cell phone number expecting to receive a call from Sunny Health with help, but they never called. I decided to call Walmart about returning the bikes and the Walmart representative said they would send someone to my home to pick up the bikes and give me a refund. Since Walmart proverbially "stepped up to the plate," I decided to reorder the same bikes in hopes of getting two that are not defective. I will re-post an update when the bikes arrive. To be somewhat fair to Sunny Health, they did say that applying "Dupont Teflon Silicone Lubricant" to the pads would stop the squeaking of pads. They said the lubricant must be silicone based.
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