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Castelli Mens Free Aero Race 4 Bibshort Kit Version
Castelli Mens Free Aero Race 4 Bibshort Kit Version
Castelli Mens Free Aero Race 4 Bibshort Kit Version

Men's Free Aero Race 4 Bibshort Kit Version

Mfg PartNum:
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Meticulous Evolution

The new Free Aero Race 4 Bibshort is the result of over a decade of partnerships with pro teams. Castelli has implemented miles of racing and riding experience into ensuring that the latest clothing is ready to meet the demands of professionals, and also that of performance-focused cyclists. As one of Castelli's best-selling bibshort for the professional rider and race-ready athlete alike, the latest iteration keeps everything loved about the Free Aero Bibshort and makes a few key improvements.

Minimal and Fast

A brand new bib construction is implemented for a minimalist fit, which has been combined with fabrics that boast better breathability. Featherweight, super-thin striped mesh aids in breathability. When the race turns up, the Free Aero Race 4 will lend to better temperature regulation than before.

New leg grippers lay flat, allowing stretch through all phases of the pedal stroke. Now with vertical silicone, the laser cut raw edges are staying right where they belong, from the beginning to the end of your ride. Receiving the updated Progetto X² Seamless seat insert reduces road vibrations while be extremely soft and comfortable.


  • Freshly updated - Castelli's most popular bib short
  • Vortex dimpled fabric on legs for aero performance
  • Forza fabric on inner legs with 38% Lycra® content for perfect fit
  • Stripe mesh engineered minimalist bib construction keeps you cool
  • Giro4 leg gripper elastic for better grip distributed over larger area
  • Doppio V construction in front for increased support and comfort
  • Flat-lock stitching reduces irritation
  • Progetto X2 Air Seamless seat insert cushions against road chatter
  • B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

    Discount Codes are not applicable to Closeouts.

    This product is NOT Eligible for VIP Points.

    Fabric: Forza 


    Weight: 172 g


    Temperature Range: 59°-95°F 


    Chamois: Progetto X2 Air Seamless seat pad 


    Discipline: Road Racing 


    Style Type: Bibs 

    Black/Black - Small

    Mfg PartNum: L20003010-2 

    Black/Black - Medium

    Mfg PartNum: L20003010-3 

    Black/Black - Large

    Mfg PartNum: L20003010-4 

    Black/Black - X-Large

    Mfg PartNum: L20003010-5 

    Black/Black - 2X-Large

    Mfg PartNum: L20003010-6 

    Dark Gray/Dark Gray - Small

    Mfg PartNum: L20003030-2 

    Dark Gray/Dark Gray - Medium

    Mfg PartNum: L20003030-3 

    Dark Gray/Dark Gray - Large

    Mfg PartNum: L20003030-4 

    Dark Gray/Dark Gray - X-Large

    Mfg PartNum: L20003030-5 

    Dark Gray/Dark Gray - 2X-Large

    Mfg PartNum: L20003030-6 

    Dark Steel Blue/Dark Steel Blue - Small

    Mfg PartNum: L20003070-2 

    Dark Steel Blue/Dark Steel Blue - Medium

    Mfg PartNum: L20003070-3 

    Dark Steel Blue/Dark Steel Blue - Large

    Mfg PartNum: L20003070-4 

    Dark Steel Blue/Dark Steel Blue - X-Large

    Mfg PartNum: L20003070-5 

    Dark Steel Blue/Dark Steel Blue - 2X-Large

    Mfg PartNum: L20003070-6 

    Black / Vortex Gray - Small

    Mfg PartNum: L20003860-2 

    Black / Vortex Gray - Medium

    Mfg PartNum: L20003860-3 

    Black / Vortex Gray - Large

    Mfg PartNum: L20003860-4 

    Black / Vortex Gray - X-Large

    Mfg PartNum: L20003860-5 

    Black / Vortex Gray - 2X-Large

    Mfg PartNum: L20003860-6 

    Ordered by Most Relevant First
    5 stars
    4 stars
    3 stars
    2 stars
    1 stars
    Top level bibs
    by Anonymous
    Cycling Enthusiast

    Very high level of quality and overall comfort, fit for me is outstanding. Only complaint is the straps kind of roll up very thin and are uncomfortable unless you take the extra minute or so to flatten them out before your ride. Also, they do run quite small, best to size up.

    Reviewed 8/16/2020
    Was this review useful to you? Yes/No
    Thank you for your feedback.
    Nice bib short but
    by Timmy B

    These are my favorite bibs, I ride them on centuries all the time. They are mostly comfortable except for the fit around the bits and pieces. Like I said I ride these all the time on long rides, great pad too, it�s just a little tight in the front.

    Reviewed 8/13/2020
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    Thank you for your feedback.
    Beautifully made shorts
    by Drerle
    New Jersey
    3 of 4 customers found this review helpful.

    High quality shorts that prioritize low weight over durability. These shorts are gossamer thin. I poked a small hole in a leg that I had the tailor fix for $20..

    The pads seem to extent more laterally than Im used to.

    Next time I may select a lower level pair of Castelli bibs for thicker more durable material.

    Reviewed 6/25/2020
    Was this review useful to you? Yes/No
    Thank you for your feedback.
    Excellent bibs
    by Jess
    2 of 2 customers found this review helpful.

    Fantastic bibs, every bit the quality and comfort of Assos at a fraction of the price. Only caveat is they run small. Im 59 155lbs and Im a large.

    Reviewed 6/21/2020
    Was this review useful to you? Yes/No
    Thank you for your feedback.