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  • Castelli Competitive Cyclist Aero Race Bib Short - Women's
  • Castelli Competitive Cyclist Aero Race Bib Short - Women's
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  • Castelli Competitive Cyclist Aero Race Bib Short - Women's Chamois
  • Castelli Competitive Cyclist Aero Race Bib Short - Women's Chamois
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CastelliCompetitive Cyclist Aero Race Bib Short - Women's
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Item # CST00PX

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Item # CST00PX

Look fast to go fast.

If you want to see what happens when you mash up some of our favorite bib shorts with Competitive Cyclist styling and livery, look no further than the Women's Competitive Cyclist Aero Race Bib Short from Castelli. It pairs top-notch materials, with a fit that's refined for day-long rides honed from its decade's experience of providing the sport's best riders with kits. And just like we've seen in bicycle frame design, these shorts give the nod towards aerodynamics and are constructed to help you slice through the wind a little easier letting you go faster with less effort. Of course, these would all be moot points if they weren’t comfortable to wear, but thankfully Castelli specs it's women's specific Progetto X2 Air Donna chamois for support and comfort.

The Aero in the name gives a hint as to the design queues Castelli instills into these bibs. It claims a reduction of power output in the neighborhood of 10 watts at 50 kilometers an hour. The secret to these gains comes from how the shorts manage airflow across their layers and textures especially the Vortex fabric dimpling on the shorts' outer thigh. Just like with a golf ball or some deep carbon rims, these dimples manage the turbulent lamina of air that runs along the shorts' surface, preventing its premature release into pockets of drag-inducing dead air. This is complemented with its stretchy Forza fabric on the inner legs which incorporates 38% Lycra to easily follow your every move and provide gentle compression.

Chamois duties are handled by the excellent Progetto X2 Air Donna insert with offers a super soft face fabric next to your sensitive areas. It retains its anti-microbial properties, seamless construction, four-way stretch, and a ventilated, perforated foam layer. A quick poll at the office has Castelli's chamois right up there with some of our favorites and our go-to shorts if we know we're in for a long ride.

The bibs' uppers feature a wide-open design that still lends support while preventing you from overheating. They feature a unique strap construction comprised of two different materials. The straps are mesh 3/4 of the way up while its Carré material cradles your shoulders. Carré is a soft, seamless strap that lies flat against your skin, so there aren't any wind-grabbing ridges from bib straps under your jersey. The seam between the mesh and Carré is reinforced, so the junction remains together after repeated wearing and washings.

The Giro Air leg grippers provide a mesh-like elastic that lies perfectly flat, offers tenacious stay-in-place grip, and a low mass helping to reduce the aerodynamic footprint. The band is also wide, spreading the pressure over a larger area and offer more gripping so hems don't move about on your ride.

  • Competitive Cyclist branded shorts for fast riding and racing
  • Dimpled Vortex fabric offers free speed with aero qualities
  • Lycra-boosted inner legs ensure you can dial a perfect fit
  • Lie-flat bib straps provide total comfort with minimal coverage
  • Flat-lock stitching reduces chaffing potential
  • Progetto X2 Air Donna chamois cushions you on rough roads
  • Lock your hems in place with Giro Air mesh-like grippers
  • Boost your low-light visibility with reflective accents
Tech SpecsSize
Tech Specs
[outer thigh] Vortex, [inner thigh] Forza
spring, summer, fall
Progetto X2 Air Donna
mesh, Carré
Leg Gripper
Giro Air
Recommended Use
road cycling
Manufacturer Warranty
1 year


Women's Cycling Apparel












































Note: Castelli has a "Euro" slimmer fit. We suggest ordering at least one size larger than your normal US size.
How to Measure:
For best results, take measurements over your underwear.
Measure under your arms, around the fullest part of your chest.
Natural Waist:
Measure around your natural waistline, keeping the tape a bit loose.
Measure around the fullest part of your body at the top of your legs.
Using pants that fit well, measure the crotch seam to the bottom of the leg.

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Avg. ride time: 5h 15m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Great Gift

  • Familiarity: I've used it several times
  • Fit: True to size
  • Size Bought: M

Purchased the complete kit for someone as a gift. Utilize the Castelli sizing guide and it is spot on. Form fitting, race day bibs as advertised. No issues, and fit and finish is top quality like you would expect from Castelli.