Castelli Free Aero Race 4 Bibknicks Black

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The Castelli Free Aero Race 4 Bibknicks were designed to perform at the highest level, using some of Castelli's best technology to form Castelli's top of the line raceday kit. Comfort meets performance with a design that is at home on raceday with an added touch of comfort so that you can really test your limits. The Vortex BLC Textured fabric offers improved aerodynamics, while the combination of Pro Lycra® fabric improves comfort with great stretch and rebound, as the Doppio V construction in the front gives you enhanced support and comfort.

The Progetto X2 Air Seamless pad gives you all day comfort so that you can spend hours in the saddle. The Giro4 leg gripper will ensure these bibknicks stay in place, while the mesh straps are comfortable and breathable. The Castelli Free Aero Race 4 Bibknicks are built for WorldTour racing performance so they will be more than capable of handling on riding or racing challenges you may have.


  • Vortex dimpled fabric on legs for aero performance
  • Forza fabric on inner legs with 38% Lycra® content for perfect fit
  • Stripe mesh engineered minimalist bib construction keeps you cool
  • Giro4 leg gripper elastic for better grip distributed over larger area
  • Doppio V construction in front for increased support and comfort
  • Flat-lock stitching
  • Progetto X2 Air Seamless seat pad
  • 15°-35°C / 59°-95°F
  • Weight:172g
More Information
Delivery Available Yes
Sizing SKUs SM: C178057, MD: C178058, LG: C178059, XL: C178060, XXL: C178061, 3XL: C178062

Castelli Sizing Chart

Size Waist Inseam Chest Hip
Womens XS 24.5" 29.5" 31" 34"
Womens Small 26.5" 29.9" 33" 36"
Womens Medium 28.5" 30.3" 35" 38"
Womens Large 30.5" 30.7" 37" 40"
Womens XL 32.5" 31.1" 39" 42"
Size Waist Inseam Chest Hip
Mens Small 31" 32.2" 36" 37"
Mens Medium      33" 32.6" 37.5" 38.5"
Mens Large 34.5" 33" 39" 40"
Mens XL 36.5" 33.5" 41" 42"
Mens XXL 38.5" 33.8" 43" 44"
Mens XXXL 40.5" 34.2" 45" 46"

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