From the first moment I tested the bike, the front brake caliper was sticking to the brake pad, preventing the wheel from spinning normally. I was on a trip when it was delivered and I emailed them as soon as I got home to let them know about the front brake calipers. They emailed me telling me how to realign it. I tried their methods about nine times and it was clear that the caliper was defective. A few days after beginning to use the bike, the pedal assist broke. They told me what to look for to fix it but nothing helped. One thing they suggested two times was to check whether the crank was tight. Both times I told them that it was already tight. I asked for a return or refund but they did not accommodate. The last thing they told me to try for the pedal assist was tightening a circular piece, but this piece had a wire attached to it which prevented it from being rotated. I told them that. Their response was to tell me to tighten the crank, which I already had told them two times was tight. Around this time the bike stopped turning on at all. I asked for an extension to the refund policy but they did not comply. I asked them what they were going to do about the pedal assist and about the bike not turning on at all, and they have not responded in four days. The suggestion to tighten the crank after being told twice that it was already tight is a dead end for the technical support for that issue. Another dead end is the fact that they have not responded in 4 days about the pedal assist or about the bike refusing to power on at all. The company warranty policy states: "All bicycles and unicycles come with a 1 year warranty on frame failure and 6 month warranty on parts against any manufacture defects." The brake caliper prevented the wheel from spinning properly from the first day. I informed the company of the parts defect within the warranty period and followed all instructions for trying to fix it before it was determined to be defective. They haven't sent a replacement for the front brake calipers more than five months after telling me they would order a replacement, and over seven months after being informed of an issue.