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Castelli Free Aero Race Bib Shorts

$139.96 $199.95

Item # CST0794 30% Off

5 5

Community Rating | 23 Reviews

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  • Black, S ($139.96)
  • Black, M ($139.96)
  • Black, L ($139.96)
  • Black, XXL ($139.96)
  • Black, 3XL ($139.96)
  • Black/White, S ($139.96)
  • Black/White, M ($139.96)
  • Black/White, L ($139.96)
  • Black/White, XL ($139.96)
  • Black/White, XXL ($139.96)
  • Black/White, 3XL ($139.96)
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Item # CST0794


Look pro.

The Castelli Free Aero Race Bib Shorts have not only survived the test of multiple seasons under Pro Tour behinds, they have moved from strength to strength largely due to the intelligent feedback from real-world professionals. Designed to provide long-lasting, durable comfort, the Free Aero Race Bib Shorts will keep you supported and ventilated during long days in the saddle. That's why Cycling Plus magazine named these bib shorts the best of the best during extensive testing in 2011.

The beauty and effectiveness of the Free Aero Race Bib Shorts comes from the targeted use of three main fabrics. First, Castelli developed what they call an Action Micro fabric that is particularly durable and placed it in the saddle contact regions, since those are the areas that get the most regular wear and tear. Energia Micro fabric is used on the sides and back of the bib shorts to take advantage of its outstanding stretch and return. The Breathe Micro fabric is used for the front of the shorts because, as its name indicates, it has been designed to let the fabric breathe to help keep the legs from overheating when the sun is beating down on a hot day.

Perhaps nothing in these bib shorts has benefited as much from Castelli's association with professional cycling teams as the Progetto X2 Air Seat Pad. The Garmin-Cervelo team spent a year testing this short; that's a lot of saddle time to be thinking about how comfort could be improved. Since Castelli had it pretty right to begin with, there wasn't much more than tweaking going on. What it has done is add a perforated foam layer to the pad to help ventilate and keep the nether regions cooler by allowing air to flow directly onto the surface fabric. That layer sitting next to your skin is made from a four-way stretch, seamless, bacteriostatic layer designed to move with you, reducing any bunching and friction. The cushioning layer consists of strategically placed, multi-density foam. For good measure, perforated viscous comfort inserts have been added under the highly sensitive ischial and perineal pressure areas, so that your undercarriage will be supremely protected whether you are out on a two-hour weekday jaunt or training over cobbles for Roubaix.

Castelli has taken great care in making sure that these will be bib shorts that will never feel stifling on a midsummer's day. Keeping your chest free from unnecessary fabric is priority, so you'll notice that the shape of the bib straps allow for a very wide opening on the front torso that dips down to the waist. You won't feel hindered by the straps and you'll really appreciate the open-air feeling on hot climbs up mountains in July. Knowing how irritating inner thigh seams can be, Castelli has eliminated them from this bib. And what seams there are have been properly sewn so as to be as unobtrusive as if there were no seams at all.

Castelli upgraded the hems of the legs by including their Giro3 integrated leg grippers, which features grip material knit directly into the short. The generous 5 cm wide band will gently compress to secure the leg hem in place. It also lies completely flat, keeping your leg aero as if it were in a skin suit. As a final touch, Castelli included highly reflective details on the back of the grippers for extra safety.

The Castelli Free Aero Race Bib Shorts are available in Black and Black/White. They come in sizes Small through XXX-Large.

  • Multi-density Progetto X2 Air insert provides critical perineal support while offering maximum airflow
  • Low-profile mesh straps keep your chest free and open to prevent overheating
  • Color-matched (to jersey) Giro3 leg grippers hold the short in place no matter how hard you hammer
  • Radio pocket sewn in mesh strap back helps keep you in contact with the rest of the team

Tech Specs

race cut
yes, Progetto X2 Air
Removable Chamois:
Recommended Use:
cycling, training, racing

Size chart


Men's Apparel
 Small Medium Large X-Large 2X-Large 3X-Large
Chest  35.5 - 37in
(90.2 - 94.0cm)
37 - 38.5in
(94.0 - 97.8cm)
39 - 41in
(99.1 - 104.1cm)
41 - 43in
(104.1 - 109.2cm)
43 - 45in
(109.2 - 114.3cm)
45 - 47in
(114.3 - 119.4cm)
Waist 29.5 - 31.5in
(74.9 - 80.0cm)
31 - 33in
(78.7 - 83.8cm)
33 - 35.5in
(83.8 - 90.2cm)
35.5 - 37.5in
(90.2 - 95.3cm)
38.5 - 40.5in
(97.8 - 102.9cm)
41 - 43in
(104.1 - 109.2cm)
Hips 36.5 - 38.5in
(92.7 - 97.8cm)
38 - 40in
(96.5 - 101.6cm)
40 - 42in
(101.6 - 106.7cm)
42 - 44in
(106.7 - 111.8cm)
44 - 46in
(111.8 - 116.8cm)
46 - 48in
(116.8 - 121.9cm)
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.

Reviews & Community

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Here's what others have to say...

5 5

Even better than the vaunted body paint

First, these are incredibly comfortable. You compression is great; very tight, but never uncomfortable. About the white and black and they look really good.

4 5

Great bib and cham, just not for me...

  • Familiarity: I returned this product before using it

I've been on the hunt for high quality bibs with a great cham in the $150-200 price range. These check those boxes . . . but you can see through the material on the sides of the legs, all the way up to the hips. I'm a pretty modest guy, I guess, so I had to return. Otherwise, these would have been perfect, and I probably would have bought two or three more. I certainly understand why others rave about these bibs so much. I guess the hunt continues, for me at least.

5 5

Great bib, perfect fit

  • Gender: Male
  • Familiarity: I've put it through the wringer

I've mentioned this in other Castelli reviews: do not "size up"! The size chart (waist) is correct as is, just use it. I'm 5'10, 32 inch waist, 155 lbs and the medium, as recommended, is perfect.

Best chamois I own, better than the top Louis Garneau which is very good. I have both both the bib and the short and while the short is often as comfortable as the bib at times it's not. Things jiggle around a bit more with the short sometimes, hard to understand why the variation. But the bib version is always just right, every ride is great.

5 5

Great bib

This is my favorite of all my castelli bibs. At 6' 165 lbs a large is perfect, these seem to have a little better compression than my others. The chamois is top notch as well as the construction of this piece. Other reviews stated these are a tad longer than most bibs which is true- not by more than an inch or so. The different fabrics also work well with these bibs. All and all a great find!!

5 5


  • Familiarity: I've used it several times

I wish someone would have told me that expensive chammys are AWESOME. First time I put them on I had a smile on my face for the first 20 miles because i hardly noticed my saddle. They feel amazing, didn't bunch at all when going in and out of the saddle and after 40+ miles. I'm stoked to take these out for a century and see how they perform. Also happy to report that the bibs are stretchy enough that you can relieve yourself without having to take the suspender straps off. Man they thought of everything.

Speaking of sizing: I'm 6'0" 185lbs, and the XL fits me perfectly. Straps aren't too tight, the legs fit comfortably above my knee.

5 5

Great bib

  • Familiarity: I've used it several times

Great bib. Very happy with selection. Regarding size, I usually order a L, but the panels on the side stretched to make it a little too revealing (black). I swapped for an XL and the fit is perfect, but in no way loose, which I would experience when I sized up. Recommend sizing up in this short.

5 5


  • Familiarity: I've put it through the wringer

Used regularly (nearly every ride) with no issues or complaints. Has held up well after 1 year of washing (2 - 3 times a week) on delicate cycle and flat air dry. Trained, raced, gran fondo, and several centuries in these shorts. I'll be buying a few pair to ensure I have a pair for each day of Ride the Rockies 2014. Expect when Mother Nature forces me to wear a winter bib (fleece) this is it! Good from 50 to 100 plus degrees.

4 5


  • Familiarity: I've used it several times

I'm 5'11'', 145lbs with 32in waist. The size large in these shorts is slightly too small for me. I'm keeping them and will wear them, but if I had to do it over again I'd go XL. They are not long enough on the thigh and the straps tug pretty tight. The short is similar to what might be called a compression fit. They are very snug and they feel like they are supposed to be. The chamois is what everyone says it is: it's fantastic. It's a tad cushy, like you would want it to be, but not too much so. The shorts are also comfortable on the bike. They are cut/tailored just right. They are also a thinner but tough piece of lycra on the legs. The intent to keep you cool is there. The shorts are priced right. You get what you pay for. If you are considering these shorts, go up one size from what you normally get, and stop procrastinating - this is the right cycling short.

5 5

Amazingly good

  • Familiarity: I've used it several times

I rarely write reviews but I'm compelled to do so on these bib shorts. As many have echoed here, these are really superb bibs. The chamois is simply amazingly comfortable for long rides and the leg compression is spot on. Quality of finish is also very, very good. XL fit me perfectly: 6' tall, 185 lb, 34" waist, 40" chest.

4 5

Almost Perfect

  • Gender: Male
  • Familiarity: I've put it through the wringer

I love these bibs so much I bought a second pair. The Progetto X2 chamois is the best on the market; it's not bulky (I'm talking to you PI) and has just enough padding in all the right places. The overall fit is superb with great compression on the legs. The upper is so comfortable you forget you're wearing bibs. I also appreciate how low the front panel drops, allowing you to answer nature's call without having to contort yourself into some sort of hunchback. The only thing that prevents me from giving 5 stars is questionable durability. On the front of the bibs at the top of the chamois stitching (where the bottom of my jersey rubs against it), the fabric is pilling and I worry this will eventually become a hole. 5'11" 160lbs 30" waist 38.5" chest - size L fits perfectly

5 5

Progetto X2 Chamois is AWESOME!

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

By far the best seat pad available. I can't say enough great things about this bib short! Comfort, fit it's there. Legs do not creep up. Chamois has a WOW factor on longer rides. Fabric breathes well. Size up as Castelli runs small. I'm 5'7 165 lbs. and wear a Large in Castelli. I am very pleased with my purchase.

5 5

Probably best bib shorts out there

  • Familiarity: I've put it through the wringer

Comfortable, supportive bib shorts. I've used these for 100 mile rides and the chamois lived up to the test. I went for the solid black and the materials are very comfortable against my skin. The chamois is very simple in appearance, but you can tell a lot of thought went into the design. Simple straps that are very comfortable as well. I'm 6'3"/195 lbs and the shorts in XL fit me perfectly. These are my "go to" shorts when I'm heading out for a long ride.

5 5

Thumbs up!

  • Familiarity: I've put it through the wringer

Awsome, awesome awesome!

Feels goods, sits well, great design

5 5

Expensive but great

  • Familiarity: I've put it through the wringer

These shorts are great, super comfortable and just feel great, the first time i used them was for an endurance mountain bike race and they kept me comfortable throughout. the most important thing is size up though I wear a L in Pearl Izumi shorts and needed an XL in these.

5 5

Expensive, but worth it

  • Familiarity: I've put it through the wringer

I used to exclusively wear Capo bib shorts, until a riding buddy suggested I try Castelli with my next pair. I bought a pair of the black Free Aero Race Bibs and have never looked back. They are now my favorite shorts - fit is great, at times I was wearing and washing them daily - no material problems or decals coming off like others report. And they still are great for rides from 20-100+ miles. I love 'em.

4 5


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

I have only used this bib shorts once so far but with that said it is clear the Castelli Aero Race Bib Shorts are quality bike shorts. I have previously used Castelli Ergo Tre Shorts and Castelli Endurance Shorts and the Castelli Free Aero Race Bib Shorts are more comfortable. I am 5'9, 155 and the large is a bit snug but overall I would say a good fit.

2 5

Started falling apart after 2 rides

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

I got these and used them on a long ride- very nice. Washed them (delicate cycle) and hang dry, used them again the next week and when I went to wash them I noticed the stitching in the chamois had started to come undone.

$200 for that? No thanks-- I'll stick w/ demarchi, desoto and craft.

Responded on

I had exactly the same problem and I waited too to return them. So, I over-sewed the undone stitching and now use these bibs for shorter rides.

5 5

Expensive, But You Get What You Pay For

A hackneyed phrase for sure, but rings true here. A very comfortable, well fitting, and good looking pair of bib shorts.
I am 5'8", 165 pounds with a 31 inch waist and the medium fits me perfectly. The chamois is extremely comfortable and lends itself to long rides (longest ride 75 miles in these bibs so far). Absolutely no chafing or discomfort after the ride.
The fit is perfect around the entire lower body, with good grip ensuring that the shorts do not migrate upwards. The straps are comfortable and not constricting in any way.
I am pleasantly surprised by the quality of construction; there are absolutely no flaws. I had a problem with the quality of a pair of Sorpasso bib tights in the past, but not a single problem with these free aero shorts.
I hand wash these and air dry, as I am a bit concerned about the iron on emblems deteriorating, but no problems so far.
I got these instead of the "Paint" product because they seem a bit more durable. Very pleased with this purchase.

4 5

Good but

Pretty darn expensive. I have other cheaper shorts I like better but not made any more. May be getting better w/ some age on them.

5 5

Medium Fit Just Right For Me

I recently got the black/white version of this bib.

I spent a long time deciding whether to get medium or small.

First of all, this is a very comfortable bib. I machine wash cold and the bib is just fine.

I was very luck to have chosen medium. I rarely saw a review with a person my size, and it was hard to gauge. I hope that this will help out some of the smaller people.

Height: 5' 7.5'
Inseam: 33'
Weight: 130 lbs

Good luck on picking the right size :)

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