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Castelli
Free Aero RC Bib Short - Men's

3.125 out of 5 stars
16 Reviews
Current price: $131.99 Original price: $219.99
40% off
Color:Black

Size:

Size Chart

Quantity


Why We Like The Castelli Free Aero RC Bib Short

Castelli's Free Aero RC Bib Short offers a compressive feel and superb comfort engineered for high-level racing. Forza 2 fabric provides outstanding muscle support and compression, and minimalist bib straps allow maximum airflow while keeping everything in place. A soft waistband and leg endings both feature a raw-cut design for added stretch and comfort, and a rear mesh pocket lets us reach back for the gels or snacks we couldn't fit in our jersey pockets.

Details

  • Minimalist and race-oriented bib short for the speedy cyclist
  • High-compression fabric reduces muscle fatigue and increases support
  • Progetto X² Air seamless seat pad for long-distance comfort
  • Bib straps enhance airflow and a reinforced yoke keeps straps flat
  • Item #CSTZ7KZ
Material
Forza 2 (32% Lycra)
Season
spring, summer, fall
Fit
compressive
Inseam
[medium] 11in
Chamois
Progetto X² Air
Pockets
1 rear mesh
Bib
yes
Leg Gripper
none
Claimed Weight
6.5oz (183g)
Manufacturer Warranty
1 year
Activity
road cycling

What do you think about this product?

Overall Rating

3 based on 16 ratings

Review Summary

1 Stars - 4 reviews
2 Stars - 3 reviews
3 Stars - 2 reviews
4 Stars - 1 reviews
5 Stars - 6 reviews

Fits Small

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

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2 out of 5 stars

August 31, 2025

Sizing way off and fabric not elastic

I love Castelli tops and accessories. I used to sell Castelli at one point of my life. Their quality and thought for the cyclist is usually higher than most. These are my first Castelli bibs. I have multiple brands from Pearl Izumi Pro to AGU, to Scott Pro +++, etc. I am 6’1”, 210 lbs, 35” waist pants and athletic build no tummy. I typically wear an XL in bibshorts and Xxl in jerseys. I wanted to love these shorts which I ordered in XXL per the reviews. The fit was terrible. I got it on but it feels like you are wearing thick nonelastic rubber similar to heavy resistance bands. I suppose this is what Castelli think is compression. It felt similar perhaps to a thick utility denim skin suit. I would have to be 180lbs with slightly less muscle on my legs for them to work. The shoulder straps are abrasive. I returned them and bought the Castelli Espresso bibshort in XXL. That short is a winner. It has true elastic compression. Stay away from the RC unless you are very slim for your height and like shorts that go to the knees. The chamois is great but the nicest part is towards the very rear. It tapers thin quickly as you go anterior. If they had extended the thick pad forward and to the middle just three more centimeters.

PSPS
5 out of 5 stars

August 20, 2025

Best shorts I've ever owned

Familiarity:
I've put it through the wringer

Make no mistake, these are targeted towards the single digit body fat, 1000K/week, leg shaving crowd. Designed to fit snugly on low volume body to maximize the compression effect and whatever aero benefits that are claimed. That's not me. 6' 1" and some change, between 200 and 205, and it's not all muscle. Size chart suggests XL, which is what I bought. Pulling these on, you notice the fit, but once you're on the bike, they disappear. One of the best pads available, the compression effect is noticeable, especially on tired legs, and a long cut on the legs to cover my longer femur bones. They are not for everyone, but for a certain type of user, they are as good as it gets.

sean203804
Competitivecyclist.com

Originally reviewed on Competitivecyclist.com

3 out of 5 stars

June 18, 2025

Great shorts if you're short.

Familiarity:
I returned this product before using it
Size Bought:
XXL

6"1" and 155# XXL straps STILL dug into upper traps. Otherwise great quality stuff.

None
1 out of 5 stars

June 3, 2025

Too small

Too small, way too small! Could barely fit into 2X. I’m not that big 6’0”, 195#

Old guySMS
Competitivecyclist.com

Originally reviewed on Competitivecyclist.com

1 out of 5 stars

May 22, 2025

Love Castelli, but not these

If you like loose leg-grippers and painful straps, these are for you!

Patrick
1 out of 5 stars

April 29, 2025

Horrible sizing/fit

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

These bibs run SUPER small. I'm 6'-0", 180lbs and wear a large in every other brand (Rapha, Le Col, Giordana, Louis Garneau, Pearl Izumi) but i could even get these on. I don't even think an extra large would fit. Not only that but they are cut extremely weird. They manage to go all the way down to the top of my knees while simultaneously having shoulder straps that were too short to even attempt to get them over my shoulders. I tried but I was afraid I was going to rip them, that's how short the straps were. They also seem to be made out of a very abrasive fabric, I can't imagine that they would be comfortable. I highly recommend avoiding these bibs but if you must, size up AT LEAST one size.

ISTVAN B
Competitivecyclist.com

Originally reviewed on Competitivecyclist.com

4 out of 5 stars

April 23, 2025

Fits super small

Familiarity:
I returned this product before using it
Size Bought:
l
Weight:
190

Very nice, but fits super small. I'm no stranger to euro sizing. But at 6 feet tall 190, the sizer large bibs were not just tight. They were unwearable. Be sure to size up from your normal size.

Sean B
5 out of 5 stars

April 19, 2025

Nice piece of kit

Familiarity:
I've used it several times

Excellent quality. Nice chamois. It's like a honeycomb cell structure put the foam is fairly firm, which I like. A smidge on the small side for me but I can pull and shimmy into them. I'm 6' even and 185 lbs. Most brands' large size fir me perfectly but these are very tight and the straps could be a bit longer. I've worn other Castelli stuff in the past, which always runs on the slightly smaller side compared to American brands, but this is even small by their standards.

Billdyd
Competitivecyclist.com

Originally reviewed on Competitivecyclist.com

5 out of 5 stars

November 5, 2024

Very confortable.

Familiarity:
I've used it several times
Size Bought:
XL

Very light and confortable, size up. Good for long redes. I usualy buy Large in other brands and XL in Castellis.

san5516273 s
2 out of 5 stars

September 4, 2024

Runs small, bib straps are uncomfortable

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

In the same size, the Aero RC fits smaller than a pair of Espresso bibs. The pad is nice and located well. The material used in the lower is comfortable and the legs do stay down without silicone gripper. The bib straps are just bad though. They aren't at all soft so are prone to raw nips. The also aren't very stretchy and are cut short for the size. So much tighter than the straps of the Espresso bibs of the same size. And there is an uncomfortable seam in the yoke that is itchy & scratchy on the upper back.

Phat P
Competitivecyclist.com

Originally reviewed on Competitivecyclist.com

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