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Is there only one docking system for frame tube diameter 22-28 mm?

Is there only one docking system for frame tube diameter 22-28 mm?

Yes.The docking system B covers frame tube diameters from 22-28mm due to its design (shape of the clamping parts). In addition there is a docking system B for 29-32 mm tube diameter, but the only difference is the length of the bolts.