In the video, a tall cyclist tests out a small bike and finds that it is much harder to ride than his usual XXL bike. He notes that the frame is much more twitchy and the handlebar is much closer to the wheel, making it difficult to control.
00:00:00 This cyclist has dropped two frame sizes from his usual XXL to an XL to large on his Obeyer Terra bike. The video's title is a play on the phrase "What happens when a tall cyclist rides a small bike?" The main issues are that the frame is not designed to handle this much weight, the wheelbase has decreased, and the bike is out of proportion to the rider's mass.
00:05:00 The cyclist tests out a small bike and a large bike, comparing size and handling. He benchmarks a XXL bike against his usual XXL or Bayer Terra bike, and finds that the small bike is more challenging. He then does a final ride on the small bike and compares it to his normal rides. He finds that the small bike is more difficult to ride, due to the smaller frame size. He also notes that due to the smaller frame size, his comfort is compromised.
00:10:00 In the video, a tall cyclist rides a small bike and finds that it is much harder to control than riding a bike on a larger frame. The cyclist also finds that the frame is much more twitchy and the handlebar is much closer to the wheel.