BMC Kaius 2025 geometry
Size chart for fitting. If this bike already feels right, find others with a similar riding position (size 47). Category: gravel.
| Size | Stack | Reach | Head tube angle | Seat tube angle | Chainstay | Wheelbase | BB drop |
|---|---|---|---|---|---|---|---|
| 47 | 530 mm | 375 mm | 70.5° | 74.0° | 425 mm | 1010 mm | 76 mm |
| 51 | 550 mm | 383 mm | 71.0° | 73.7° | 425 mm | 1020 mm | 76 mm |
| 54 | 568 mm | 390 mm | 71.5° | 73.5° | 425 mm | 1030 mm | 74 mm |
| 56 | 586 mm | 397 mm | 71.5° | 73.2° | 425 mm | 1040 mm | 74 mm |
| 58 | 606 mm | 404 mm | 72.0° | 73.0° | 425 mm | 1052 mm | 72 mm |
| 61 | 626 mm | 411 mm | 72.0° | 73.0° | 425 mm | 1064 mm | 72 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.