| 摘要 |
A simple, user-installable device for raising the handlebars of bicycles to allow an upright sitting posture, comprising a section of tubing, with one end (2) adapted to receive the handlebar stem (8), and the other end (1) adapted for insertion into the steering shaft (7). It is fixed in the steering shaft via an expansion device (5), and the handlebar stem is fixed in the extender via its own expansion device. An optional shock absorber may be included in the extender. In this embodiment, the upper end of the extender is enlarged to contain a slidable hollow plunger (21) which receives the handlebar stem. The plunger is damped to isolate frame vibration from the user's arms. This also reduces shock on the front wheel by isolating the mass of the handlebars from the fork. In addition to raising the handlebars, the stem extender can be designed to accept a replacement stem of different diameter than the original.
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