I advise you to buy at least two to have a good selection of pieces. I only have the two largest gears in one and four in the other. The stock wheels were in a hot mess upon arrival and were difficult to turn. Pull the center out of the wheel if you're having similar problems. A sharp tip of tweezers will suffice, which you will need to fine tune parts stuck in the rotating mechanism. The center round piece is only held up by a simple center post and should pop out easily if you handle one of the tweezer blades while lifting it. Most likely you will see gears stuck inside, which can easily be removed with tweezers. I placed both gears on a plastic tray with holes to sort the gears. In the end I combined both bikes into one bike because there was a lot of space. I highly recommend keeping the wheel upright at all times so the gears stay in place and don't get caught on the inner workings of your wheel. Hope this review helps. I look forward to having some fun with them soon and hope you do too if you decide to buy them.
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