Bicycle frame for mountainbikes and citybikes, has step-through section, where receptacles of connections in area of tubes are wider than themselves and bottom bracket obtains new position with objective of partial decoupling from frame

摘要

The bicycle frame has a step-through section with headtube, upper tube, lower tube and saddle tube or tubes in different moldings, bottom bracket housing, saddle struts and lower struts. The connections between the upper, lower and saddle tube or tubes are redesigned for localization, number and shape. The headtube, upper tube, lower tube and saddle tube or tubes are placed together in a new way. The receptacles of the connections in the area of the tubes are wider than themselves. The bottom bracket obtains a new position in the frame with the objective of partial decoupling from the frame.