| 摘要 |
A frame for a bicycle in which two beams, which intersect to form a cruciform, in side elevation, extend between a head tube and a seat tube. Each beam being structurally efficient in the transverse plane. The cruciform being rendered structurally efficient in the vertical plane by a tie running beneath the cruciform and extending between lower regions of the head and seat tubes. The front and rear parts of the frame are separably joined to one another at the junction of the cruciform by means of a first coupling. The tie also being separable into front and rear parts, by means of a second coupling located immediately below the first coupling.
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