Assembly was easy and I can tell they used solid materials, manufacturing, and finishing methods when making this product. If you?re having a similar problem, try using some household items to help out! My son (14 year old) and I (girl power) put it together in about 2 hours total. Now get off your phone and go have an adventure! These are just as pictured and very comfortable. De haber sabido esto antes, no lo habría comprado. I only get a red light for about 15 seconds and thats the only sign of life. All our bikes have been purchased used so there has been plenty of work. I bought this pair and I?m very happy with them. Considering a purchase for my teenager daughter.