2026 Transition · MDB
2026 Transition Spire geometry
Full frame geometry for the 2026 Transition Spire, 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) | BB drop (mm) | Chainstay (mm) | Wheelbase (mm) |
|---|---|---|---|---|---|---|---|---|
| MD | 619 | 460 | 78.8 | 63 | 100 | 25 | 446 | 1257 |
| SM | 619 | 430 | 79.6 | 63 | 100 | 25 | 446 | 1227 |
| MD Low | 624 | 455 | 78.8 | 62.5 | 100 | 32 | 448 | 1259 |
| SM Low | 624 | 425 | 79.6 | 62.5 | 100 | 32 | 448 | 1229 |
| LG | 628 | 485 | 78.1 | 63 | 110 | 25 | 446 | 1287 |
| LG Low | 633 | 480 | 78.1 | 62.5 | 110 | 32 | 448 | 1289 |
| XL | 637 | 510 | 77.5 | 63 | 120 | 25 | 452 | 1322 |
| XL Low | 642 | 505 | 77.5 | 62.5 | 120 | 32 | 454 | 1324 |
| XXL | 646 | 535 | 77.2 | 63 | 130 | 25 | 452 | 1352 |
| XXL Low | 651 | 530 | 77.2 | 62.5 | 130 | 32 | 454 | 1354 |
All measurements in millimetres unless marked (°) for angles.