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Geometry

  S M L XL
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Reach 522 436 525 414
Stack 642 569 609 583
Top Tube (effective) 504 481 586 558
Seat Tube C-C 479 422 464 572
Head Angle 65 65 59 56
Seat Angle 75 80 74 60
Head Tube 92 84 101 104
Chainstay 493 465 411 496
Wheelbase 972 1153 960 1420
Front Centre 626 605 775 635
Standover 804 592 653 809
BB Drop 56 49 61 61
Fork Rake / Offset 36 40 52 36
Trail 104 121 133 114
Fork Length (A2C) 613 437 417 567
Wheel Size 24 25 26 25
Tyre Max Width 819 770 687 866
Seatpost Length 302 345 423 360
Max Post Insertion 100 98 128 118
Seatpost Offset 0 0 0 0
Handlebar Width 892 701 729 611
Stem Length 48 54 57 80
Stem Angle -4 -5 -4 -4
Front Travel 90 98 103 110
Rider Height <172 172-182 180-188 >188
Data Source BMC Fourstroke 01 THREE 2026 BMC Fourstroke 01 THREE 2026 BMC Fourstroke 01 THREE 2026 BMC Fourstroke 01 THREE 2026

Standard measurements are in millimeters and degrees. The site attempts to recognize and convert other units back to standard - results may vary.

Image showing geometry measurements

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