| 摘要 |
A bicycle for includes fork head (2) from which two sleeves (3a,3b) branch off and, on the side opposite to the sleeves, a tubular pivot (4) comprising a lower cylindrical portion (4a) integral with the fork head, and an upper cylindrical portion (4b) for fixing a stem. The external diameter (Da) of the lower cylindrical portion (4a) of the pivot is larger than the external diameter (Db) of the upper cylindrical portion (4b) of the pivot, and a transitional zone (4c) links the two parts (4a,4b) with different diameters.
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