2026 Surly · G
2026 Surly Preamble geometry
Full frame geometry for the 2026 Surly Preamble, 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) | Standover (mm) | BB drop (mm) | Chainstay (mm) | Wheelbase (mm) | Fork rake (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| XS | 517 | 352 | 74 | 70 | 120 | 500 | 410 | 722 | 54 | 420 | 987 | 47 |
| S | 535 | 381 | 73 | 71 | 135 | 545 | 505 | 776 | 54 | 420 | 1013 | 47 |
| M | 567 | 391 | 72.5 | 72 | 130 | 570 | 565 | 826 | 66 | 435 | 1030 | 44 |
| L | 605 | 404 | 72 | 72 | 170 | 600 | 605 | 863 | 66 | 435 | 1055 | 44 |
| XL | 643 | 421 | 72 | 72 | 210 | 630 | 645 | 901 | 66 | 435 | 1085 | 44 |
All measurements in millimetres unless marked (°) for angles.