Cannondale Synapse Carbon 2025 geometry
Size chart for fitting. If this bike already feels right, find others with a similar riding position (size 48). Category: road-endurance.
| Size | Stack | Reach | Head tube angle | Seat tube angle | Chainstay | Wheelbase | BB drop |
|---|---|---|---|---|---|---|---|
| 48 | 535 mm | 365 mm | 70.8° | 74.3° | 415 mm | 990 mm | 78 mm |
| 51 | 555 mm | 371 mm | 71.3° | 74.0° | 415 mm | 998 mm | 78 mm |
| 54 | 575 mm | 377 mm | 71.8° | 73.7° | 415 mm | 1006 mm | 76 mm |
| 56 | 595 mm | 383 mm | 72.3° | 73.3° | 415 mm | 1016 mm | 76 mm |
| 58 | 615 mm | 389 mm | 72.5° | 73.0° | 415 mm | 1028 mm | 74 mm |
| 61 | 635 mm | 395 mm | 72.8° | 72.7° | 415 mm | 1040 mm | 74 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.