Crux 5

The Only Metric that Matters

When the objective is winning races, the goal is brutally simple. Get riders to the finish line faster. For Crux 5, that meant answering one question. Does this bike reduce total race time on the fastest, hardest gravel courses on Earth? To answer that, we built the most comprehensive gravel race simulations ever created. The result? Crux 5 is up to 9:58* faster over Unbound. 

15.2 Watts Faster

The Crux 5 is the most aerodynamic gravel race bike we’ve ever made. Drawing directly from Tarmac SL8 learnings and decades of aero research, every tube on Crux 5 was sculpted for speed at elite gravel race speeds.

Aero Gains Breakdown: Frame, fork & seatpost: 50%. Roval Terra Aero wheels: 30%. Roval Terra cockpit: 20%.

At 789 grams, the S-Works Crux 5 frame stands alone at the top of the gravel lightweight category. Complete builds start at 6.9 kg—a number most road bikes envy. Even in a full aero setup with 55 mm clearance and Tera Aero CLX III wheels, S-Works Crux 5 is lighter than the competition at 7.1 kg. This was made possible by Flow State Design, first pioneered on the Aethos road bike.

Speed Everywhere, All-Day.

Speed isn’t just about peak numbers—it’s about sustaining power and momentum deep into the race. Crux 5 delivers telepathic handling, instantaneous acceleration, and balanced compliance that reduces fatigue on the roughest courses. Rider First Engineered and now with 55mm tyre clearance for unmatched traction and comfort, it preserves the legendary ride feel of Crux 4—while adding real aerodynamic performance.