2026 Basso · RD
2026 Basso Astra geometry
Full frame geometry for the 2026 Basso Astra, size by size — stack, reach, angles and tube lengths.
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Geometry by size
| Size | Stack (mm) | Reach (mm) | Seat angle (°) | Head angle (°) | Head tube (mm) | Top tube (mm) | Seat tube (mm) | Front centre (mm) | Chainstay (mm) |
|---|---|---|---|---|---|---|---|---|---|
| 45 | 538.9 | 371.1 | 76 | 71.8 | 125 | 505 | 450 | 576.9 | 404 |
| 48 | 538.9 | 371.1 | 75 | 71.8 | 125 | 515 | 480 | 576.9 | 404 |
| 51 | 563.4 | 374.5 | 75 | 72 | 150 | 525 | 510 | 586.4 | 404 |
| 53 | 575.9 | 380.4 | 74 | 72.3 | 162 | 545 | 530 | 593.2 | 404 |
| 56 | 602.4 | 382.1 | 73.5 | 73.5 | 180 | 560 | 560 | 590 | 406 |
| 58 | 625.4 | 384.4 | 73 | 73.5 | 204 | 575 | 580 | 599 | 410 |
| 61 | 650.4 | 385.5 | 72.5 | 74 | 228 | 590 | 610 | 602 | 410 |
All measurements in millimetres unless marked (°) for angles.