2026 Chapter2 · RD
2026 Chapter2 Rira Ultra geometry
Full frame geometry for the 2026 Chapter2 Rira Ultra, 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) | Front centre (mm) | Chainstay (mm) | Wheelbase (mm) | Fork rake (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| XS | 489 | 361 | 74 | 70 | 90 | 502 | 430 | 721 | 74 | 574 | 410 | 972 | 53 |
| S | 517 | 371 | 74 | 72 | 112 | 520 | 450 | 744 | 73.5 | 576 | 410 | 974 | 53 |
| M | 545 | 381 | 74 | 73 | 135 | 538 | 470 | 768 | 73 | 574 | 410 | 975 | 43 |
| L | 573 | 391 | 74 | 74 | 161 | 555 | 500 | 799 | 72.5 | 584 | 410 | 982 | 43 |
| XL | 601 | 401 | 74 | 74 | 191 | 574 | 530 | 827 | 72 | 602 | 410 | 1001 | 43 |
All measurements in millimetres unless marked (°) for angles.