2018 Surly · G
2018 Surly Midnight Special geometry
Full frame geometry for the 2018 Surly Midnight Special, 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) | Trail (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 40 | 531 | 363 | 75.5 | 71 | 95 | 500 | 400 | 720 | 70 | 574 | 425 | 993 | 50 | 69 |
| 46 | 538 | 366 | 74 | 71.5 | 100 | 520 | 460 | 751 | 70 | 575 | 425 | 994 | 50 | 65 |
| 50 | 544 | 379 | 73.5 | 72 | 110 | 540 | 500 | 778 | 65 | 587 | 425 | 1007 | 50 | 62 |
| 54 | 560 | 389 | 73.5 | 72.5 | 125 | 555 | 540 | 806 | 65 | 597 | 425 | 1018 | 50 | 59 |
| 56 | 580 | 393 | 73 | 73 | 140 | 570 | 560 | 827 | 65 | 591 | 425 | 1012 | 40 | 66 |
| 58 | 599 | 402 | 73 | 73 | 160 | 585 | 580 | 846 | 65 | 606 | 425 | 1027 | 40 | 66 |
| 60 | 620 | 409 | 72.5 | 73.5 | 180 | 605 | 600 | 866 | 65 | 614 | 425 | 1036 | 40 | 63 |
| 64 | 641 | 423 | 72.5 | 74 | 200 | 625 | 640 | 895 | 65 | 628 | 425 | 1050 | 40 | 60 |
All measurements in millimetres unless marked (°) for angles.