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Castelli Free Aero Race Team Bib Shorts - Men's


Item # CST005I

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Item # CST005I

Smooth operator.

Castelli built the Free Aero Race Team Bib Shorts for one functional purpose: to smooth out the air. The Team designation implies a difference though, and that difference is the addition of design elements that are so subtle that they may as well only be implied, too. It's got a splash of Italian flair, including Castelli's iconic red as an underscore to stress the leg bands' low-contrast branding, but the flashiest element of the kit remains the literally flashy reflective patches on the backs of the legs. The graphical restraint means the shorts operate as smoothly on the eyes as they do in the wind.

Just like the rest of its family tree, the Free Aero Race's Team version is designed to cheat the wind, reducing power output requirements by a claimed 10 watts at 50 kilometers an hour. The secret to these gains lies in how the shorts manage airflow across their multiple boundaries and textures — most obviously via the dimpling across the shorts' outer plane. 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.

The shorts also keep the beloved Progetto X2 Air Seat Pad, which returns from last year's version with only one, minor change. Its surface is softer, which means it now presents a more gentle face to your perineum. It retains its bacteriostatic properties, seamless construction, four-way stretch, and ventilating, perforated foam layer. The perforated viscous comfort inserts also enjoy an encore performance, so your sensitive areas will enjoy riding over all manner of terrain.

Those may be the only returning features of the previous model — not even the materials used were safe from Castelli's obsessive need to tinker. The seat and front of the shorts both feature fabrics designed for durability and cooling breathability, respectively, and the entire body is 30% Lycra for a fit that strikes a balance between compression and unrestrictive movement.

The bibs' wide open, non-stifling design also returns from the previous model, but the bibs themselves now comprise two materials. The straps are mesh 3/4 of the way up, but — like any good domestique — the mesh lets a yolk of Castelli's innovative Carré material summit your shoulders. Carré is a hem-less strap that lies virtually flat against your skin, so there aren't any wind-grabbing, stegosaurus ridges from bib straps bulging out of your jersey. The liminal seam between mesh and Carré is also reinforced, so you don't have to worry about any wardrobe malfunctions while hoisting the trophy on the podium.

Last year's model featured Castelli's upgraded Giro3 integrated grip bands at the hem, but it shouldn't surprise you at this point that Castelli has upgraded these yet again. The new Giro Air has the same perfectly flat, stay-in-place grip, but with less mass, which no doubt contributes to the claimed overall weight loss of 17 grams and definitely reduces the aerodynamic footprint. The new band is wider, almost equaling the length of a typical Euro-slammed road stem, and every square millimeter of the material acts as the gripping agent. No silicone gel print here.

The lower mass means the leg bands are also pretty transparent, which may initially be a turn-off, but will likely take off as it appears in the pro peloton. In this case, it's important to note that "pro" isn't short for "UV protection," so we recommend a bit of sunscreen applied a few minutes before suiting up.

  • 30% Lycra, dimpled side panels to reduce wind drag
  • Race fit with light compression
  • Progetto X2 Chamois
  • Carré yolk bib straps provide hem-less comfort on your shoulders
  • Giro Air leg grippers
  • Reflective accents

Tech Specs

race fit
Progetto X2 Air
yes, Carré yolk
Leg Gripper:
Giro Air
Claimed Weight:
[size large] 178 g
Recommended Use:
road cycling
Manufacturer Warranty:
30 days

Size chart


Men's Apparel
Chest 36.2in
Waist 31.5in
Hip 37in
Inseam 31.9in
How to Measure:
For best results, take measurements over your underwear.
Measure under your arms, around the fullest part of your chest.
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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Here's what others have to say...

Avg. ride time: 3h 46m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Perfect bibs?

    If they aren't perfect, they're mighty close. These fit perfectly. The chamois is great. The straps are made of some kind of magical unicorn skin. They feel UNREAL. Every time I train or race in other bibs it's a little bit of a let down. Another home run from Castelli...


    Excellent quality!

    • Familiarity:I've used it several times

    The product is of excellent quality in terms of material, workmanship, and design. I am about 5'-10"/165 lbs and bought a large. Normally I would buy a medium. The large still fits tight but is comfortable when riding because of the material. I have found with Castelli products you can easily select a size up and have a good fit.



    • Familiarity:I've used it several times

    I have this bibs for less than 3 months ..Were great when new with tight fitting and compression feel...In less than 3 months have become really soft and they stretch too easily out of position...Not impressed for the cost..Chamois is great ..


    Quadzilla Beware - Runs Small

    • Familiarity:I returned this product before using it

    I usually wear a Large in Castelli bibs. I read the reviews and decided to size up and went with the XLs. These things are still too small and I'm 6'/190(33waist/32inseam) with muscular thighs/butt. I like my clothing snug/race fit, but these bibs are very constricting on the legs and crotch. If I went with the XXL, the length would be longer than I like. Really bummed...these things are quality material and well made.


    Perfect fit and feel.

    • Gender:Male
    • Familiarity:I've used it several times

    Im 6�3, 185lbs, 34/34 pants and this bibs fit and feel perfect. Nothing more to say :-)

    What size did you get?

    Avg. ride time: 3h 31m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    awesome bibs

    • Familiarity:I've used it several times

    This bibs are great but run smaller then other Casttelli ordered med but had to exchange for lg. The chamois is great and your butt will thank you. I have used them on three 30 mile rides and they performed very well.

    Avg. ride time: 4h 34m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    Sweet Bibs

    • Familiarity:I've used it once or twice and have initial impressions

    These bibs are freakin' sweet. Haven't used them a ton yet, but if your like me, you know a good thing when use it.

    Unanswered Question
    Avg. ride time: 4h 34m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    does castle have a team version jersey?