Bicycle frame for use by person with hip problems, has seat tube limiting free space that extends in area between bottom bracket retainer, rear wheel retainer and saddle retainer, where free space is opened at steering wheel-side

摘要

The frame (10) has a bottom bracket retainer (12), a saddle retainer (14), a rear wheel retainer (16), a retainer (18) for steering wheel (20) and front wheel fork (22), and a seat tube (30) that connects the bottom bracket retainer with the saddle retainer. The seat tube limits a free space (38) that extends in an area between the bottom bracket retainer, the rear wheel retainer and the saddle retainer, where the free space is opened at a steering wheel-side. The seat tube is connected with an upper tube (28) in a break-free and smooth manner.