Frame geometry per size. Jamis does not publish rider heights for the Allegro.
| Size | Top Tube (mm) | Stack (mm) | Reach (mm) | Head Tube (mm) | Standover (mm) |
|---|---|---|---|---|---|
| 15" | 569 | 545 | 402 | 121 | 726 |
| 17" | 570 | 569 | 392 | 147 | 757 |
| 19" | 577 | 592 | 396 | 173 | 798 |
| 21" | 589 | 616 | 401 | 195 | 836 |
| 23" | 601 | 639 | 406 | 219 | 867 |
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