BMC Roadmachine 2023 geometry
Size chart for fitting. If this bike already feels right, find others with a similar riding position (size 47). Category: road-endurance.
| Size | Stack | Reach | Head tube angle | Seat tube angle | Chainstay | Wheelbase | BB drop |
|---|---|---|---|---|---|---|---|
| 47 | 524 mm | 362 mm | 71.0° | 73.5° | 415 mm | 984 mm | 75 mm |
| 51 | 547 mm | 370 mm | 71.5° | 73.5° | 415 mm | 993 mm | 75 mm |
| 54 | 569 mm | 377 mm | 72.0° | 73.5° | 415 mm | 1003 mm | 73 mm |
| 56 | 589 mm | 383 mm | 72.0° | 73.5° | 415 mm | 1013 mm | 73 mm |
| 58 | 609 mm | 389 mm | 72.5° | 73.5° | 415 mm | 1025 mm | 71 mm |
| 61 | 629 mm | 395 mm | 72.5° | 73.5° | 415 mm | 1037 mm | 71 mm |
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Size guidance
Stack and reach describe the frame's cockpit envelope better than traditional seat-tube sizing. If you know your preferred stack/reach from a bike that already fits, search within a few millimeters first, then check head angle and chainstay for handling feel. See the glossary for stack, reach, and HTA.