The subject wants to ask "What model is the rear wheel bearing of Sentuo variable speed bicycle"? Inner diameter 10mm, outer diameter 30mm and height 9mm. According to the profile of Beijing sentuo outdoor products co., ltd, sentuo variable-speed bicycle is owned by the company. The rear wheel bearing model of Sentuo variable speed bicycle is 6200, with an inner diameter of 10mm, an outer diameter of 30mm and a height of 9 mm.