Get It Before Labor Day Weekend—Order With Free 2-Day*by 5pm MT 9/2/15


It’s all in the name.

Castelli’s Free Aero Race Bib Shorts hide their assets in their name. Namely, free speed, aerodynamics, and race-oriented. The Free Aeros utilize a variety of surface textures, fabrics, and time in the wind tunnel to deliver a claimed 10-watt savings at 50kph. This may not seem like much, but those savings add up over even a two or three hour ride, and could mean the difference between enough power for a sprint and pedaling lamely to the line.

At the core of the shorts sits Castelli’s Progetto X2 Air chamois, with one minor-but-crucial improvement —a softer face fabric. You get all the support and chafing resistance you expect from the Progetto, but it’s a bit kinder to your skin now. We’d be remiss to not mention the lightness of all of the fabrics in the Free Aero Race, in part because they’re comfortable and airy on even the hottest days, but also because you’re going to want to apply a bit of sunscreen at the leg bands.

  • Claimed savings of 10 watts at 50kph due to aerodynamics
  • Progetto X2 Air chamois
  • Giro Air leg bands stay in place without the use of silicone

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Castelli Free Aero Race Bib Shorts - Men's

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Here's what others have to say...

Unanswered Question

Is my ass crack going to show through these after a few months of uses? Just wondering if anyone has had these for more than a few months? The material looks great for breathability but i dont want to run into problems down the road.

4 5

Bought 2

  • Familiarity: I've used it several times
  • Fit: True to size
  • Height: 5' 7"
    Weight: 160 lbs
    Size Purchased: M

I am new to cycling. I wanted to get a decent pair of shorts so that I had the best chance of enjoying the sport. These have not let me down. They are comfortable, look good, and fit perfectly. I'm 5'7

Oh they could be a little cheaper...but oh well

4 5

Glad I bought them

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

I researched bibshorts after my previous two pair began to cause saddlesores. To be fair, I did have the last ones (not the same manufacturer) a year or two longer than they were intended to live. They began to loose their compressive character, and I should have been a bit more observant about fit. Free Aero's were on sale and I gave them a try. Started with one pair but after 1 ride jumped on the second as the chamois was superb and the compressive fit exactly as described...they disappear on you. All other reviews from here were spot on including smallish sizing, so that really helped me. Saddlesores disappeared after a reasonable period of time and meticulous hygiene attention. Let's see how long they live! Good deal on sale if you can get it.

I have had these bibs for about 2 months and have washed them about 5-6 times. I just noticed that the front of the chamois has become dislocated and partially folded over inside of the outer fabric. What is the warranty and is there any way to get them replaced?

Responded on

I had really good luck with the Castelli warranty department. Chainlove/Steep and Cheap only offer 30 days, but I think that Castelli warranty is 1 year for workmanship problems. You have to send them in, and they will evaluate them and send you a replacement, if it is a workmanship issue.

Responded on

Did you ever get this taken care of? Just noticed the exact same problem on mine.

5 5

Best bib on market!!

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

Best bib ever owned.Fits like a glove.5'8 140LBS and a med fits perfect

5 5

I'll never bother with any other bibs

  • Familiarity: I've used it several times
  • Fit: Runs small
  • Height: 5' 11"
    Weight: 165 lbs
    Size Purchased: xl

These are my first bibs after many pairs of shorts.
They are easily more comfortable than my best shorts. I first used them in a 75 mi race and they just disappeared. I never gave them a thought, they just sat there and did their job.
The straps are a little snug, but I do have a ridiculously long torso.
I'll never consider any other bibs. They are pricey, but time in the saddle is valuable and these have ruined me for anything lesser.

5 5

Super comfortable, great chamois

  • Familiarity: I've put it through the wringer
  • Fit: Runs small

Update after numerous rides... New favorite bibs, mainly because of GREAT chamois, super comfortable, no chafing after back-to-back 101/65-mile rides in high heat and humidity, just the right amount of padding, etc. New straps, leg bands are different but I found both really comfortable. Redesigned crotch area is MUCH improved. Last year's left no room for the obvious. Now, fit great. Agree with other review - typical Castelli sizing. I'm 5' 8", 155, order a medium. Wish they would do a Skratch Labs color way like offered last year.

Super comfortable, great chamois
5 5

1st ride

Just got these and took them out for an 80 mile ride. I like the fabric on the shorts and the leg band better than the previous year's free aero bibs. I don't think I like the fabric at the top of the straps as much, but all in all I think they are an improvement from last year's model. Typical Castelli sizing. I'm 135 lbs and wear a medium. They fit well but are tight especially around the thighs.

Free Aero Race - dimpled fabric

Free Aero Race - dimpled fabric

As the name suggests, the Free Aero Race Shorts are 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.

Free Aero Race - back view

Free Aero Race - back view

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. Castelli also included highly reflective details on the back of the grippers for extra safety.

Free Aero bib straps - back

Free Aero bib straps - back

Carré engineered lie-flat bib strap construction for minimal coverage, maximum comfort. Carré is a hem-less strap that lies virtually flat against your skin.

Progetto X2 Air Chamois

Progetto X2 Air Chamois

The Castelli Free Aero Race bib shorts feature a new softer surface fabric on the updated Progetto X2 Air seatpad. The innovative double V construction on the front keeps everything in place without compressing your stomach.

Castelli Free Aero Leg Band

Castelli Free Aero Leg Band

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.