Repair mountain bike, speed car special tools, it includes dual screws, connectors and dual sets of dual-head, of which, at the end of dual screw hexagonal structure; dual kit lens inside the inner wall also hexagonal structure, dual sets of head machining the outer wall having at least two projections bond; dual wall fitting is threaded, which is threaded at one end wall, and the other end is provided with a plurality of keyways. Its advantages are: simple structure is reasonable, because the tool designed for repairing mountain bike, designed for variable speed drive, so use it to repair such vehicles, convenient, practical, fast, easy to use, is an ideal special repair tools.