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RRP 219,95
139,95
- Ordered before 22:00, delivered tomorrow
- Free tracked delivery
Our choice for men's performance bib shorts
With the Castelli Free Aero Race S Kit you choose the fastest bib shorts we have ever made. Thanks to the aerodynamic Forza2 Stretch fabric and the seamless Progetto X2 Air chamois you experience maximum comfort during your longest rides. It is our choice for performance bib shorts for men because the compression supports your muscles optimally without pinching. The minimalist straps keep you cool and the grippers ensure that everything stays perfectly in place.
Pros & Cons
Pros & Cons
- The Progetto X2 Air Seamless padding supports lasting seat comfort, which is important on long rides.
- As the Forza2 Stretch fabric moves smoothly with every pedal stroke, the bib short remains very comfortable.
- Aerodynamic optimisation contributes to more efficient use of energy, which is a definite plus for performance riders.
- Integrated UPF 50+ helps protect your skin, which is particularly nice and practical on long rides in the sun.
- The tight Race fit may make the bib short less suitable for riders used to a looser fit but does improve aerodynamics.
- The back pocket offers space for small items but cannot hold larger ones, which is in line with the competition design.
Specifications
Specifications
| Brand | Castelli | |
| Straps | Seamless straps | |
| Chamois | With Chamois | |
| Chamois quality | Top class | |
| Bib short leg hem | Non-slip raw cut | |
| Waterproofing | Not waterproof | |
| Windproof | Not windproof | |
| Fit | Aero | |
| Sex | Men's |
Castelli's Free Aero Race S Kit bib short is made for cyclists keen to combine comfort and speed on high-intensity rides. It fits closely to your body and moves smoothly with every pedal stroke. The focus is on efficient aerodynamics, long-lasting comfort and a stable fit throughout training sessions and races.
Material and seat pad
The Forza2 Stretch fabric follows the contours of your body and supports the garment's tight Race fit without being too tight. This helps to reduce drag, achieving a measured 3% decrease in CdA for improved aerodynamic efficiency. The Progetto X2 Air Seamless chamois offers long-lasting comfort on long training days. The lightweight mesh bib straps feel airy and dissipate heat effectively, which you will appreciate on high-intensity rides in sunny conditions. The fabric also incorporates UPF 50+ protection.
Finishes and details
The minimalist mesh bib straps are lightweight, breathable and stretchy, and remain securely in place without feeling heavy. Silicone grippers at the leg ends keep the bib short well in place while cycling. On the back, there is a pocket that provides space for small items or a race radio. These details contribute to practical use during training and races, and ensure that the bib short is functional but does not include any unnecessary additions.
The Forza2 Stretch fabric follows the contours of your body and supports the garment's tight Race fit without being too tight. This helps to reduce drag, achieving a measured 3% decrease in CdA for improved aerodynamic efficiency. The Progetto X2 Air Seamless chamois offers long-lasting comfort on long training days. The lightweight mesh bib straps feel airy and dissipate heat effectively, which you will appreciate on high-intensity rides in sunny conditions. The fabric also incorporates UPF 50+ protection.
Finishes and details
The minimalist mesh bib straps are lightweight, breathable and stretchy, and remain securely in place without feeling heavy. Silicone grippers at the leg ends keep the bib short well in place while cycling. On the back, there is a pocket that provides space for small items or a race radio. These details contribute to practical use during training and races, and ensure that the bib short is functional but does not include any unnecessary additions.
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What to look out for when buying new cycling legwear [Buyer's Guide]
Read moreReviews
Reviews
3 / 5
It fits well, but it’s a shame the hem’s curling up.
- J.H. 27 September 2026
Castelli isn’t the cheapest, but the value for money is excellent. With a slight change to their design, they’ve now missed the mark. It’s a shame. I’ve been happily wearing Castelli trousers for over 15 years. But it doesn’t look good when the leg of a pair of trousers starts curling up after just two wears.
Pros & Cons
Fit
The chamois sits comfortably
The hem curls up.
Automatic translation
5 / 5
Good value for money
- Lg 15 September 2026
Small size. I went up to sizes and fit me perfect
Pros & Cons
Good padding
Nice look
Very comfortable
Nothing I’ve found yet.
3
J.H., 27 September 2026
It fits well, but it’s a shame the hem’s curling up.
Castelli isn’t the cheapest, but the value for money is excellent. With a slight change to their design, they’ve now missed the mark. It’s a shame. I’ve been happily wearing Castelli trousers for over 15 years. But it doesn’t look good when the leg of a pair of trousers starts curling up after just two wears.
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Fit
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The chamois sits comfortably
-
The hem curls up.
Automatic translation
Frequently bought together
Frequently bought together
Recommended by the product specialist
Recommended by the product specialist
Related products
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| Castelli Free Aero Race S Kit | Assos Mille GT S11 | Assos Equipe R S11 | Castelli Espresso 2 | |
| 2 reviews | 7 reviews | 10 reviews | 3 reviews | |
| Select the waist size of your jeans for a size recommendation | 27 - 29 / 30 - 32 / 33 - 35 / 36 - 38 | 26 - 27 / 28 - 29 / 30 - 31 / 32 - 33 / 34 - 35 / 36 - 37 / 38 - 39 | 27 - 29 / 30 - 32 / 33 - 35 / 36 - 38 / 39 - 41 / 40 - 42 / 42 - 44 | 21 - 22 / 23 - 25 / 26 - 28 / 29 - 31 / 32 - 34 / 35 - 37 / 38 - 40 |
| Size (manufacturer) | M / L / XL / XXL | XS / S / M / L / XL / XXL / 3XL | S / M / L / XL / XXL / 3XL | XS / S / M / L / XL / XXL / 3XL |
| Straps | Seamless straps | Seamless straps | Seamless straps | Seamless mesh straps |
| Chamois | With Chamois | With Chamois | With Chamois | With Chamois |
| Chamois quality | Top class | Top class | Top class | Top class |
| Bib short leg hem | Non-slip raw cut | Non-slip elastic band | Non-slip raw cut | Non-slip raw cut |
| 139,95 | 159,95 | 159,95 | From 119,95 | |
| This product | View product | View product | View product |
All specifications
General
Brand
Castelli
Chamois quality
Top class
Bib short leg hem
Non-slip raw cut
Sex
Men's
Temperature
15 - 25+ °C
Properties
Straps
Seamless straps
Chamois
With Chamois
Waterproofing
Not waterproof
Windproof
Not windproof
Fit
Aero
Sun protection
With sun protection / UPF 50