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Castelli Men's Free Aero Race 4 Bibshort

Mfg PartNum:
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Castelli's Men's Free Aero Race 4 Bibshort features a new leg gripper design with vertical silicone stripes to keep it in place without restricting stretch. New fabric allows for better print quality. The seams have been updated to improve the fit and make the short look even better on the body. The bib straps have been re-engineered with new fabrics and construction to enhance airflow, durability, and smoothness against the body. This bib short also received the updated Progetto X2 Air seamless seat pad featuring Castelli's softest surface fabric.

Features & Specs:

  • Vortex dimpled fabric on legs.
  • Forza fabric on inner legs with 38% Lycra® content.
  • Cooling stripe mesh engineered minimalist bib.
  • Giro4 leg gripper elastic for better grip distributed over larger area.
  • Supportive Doppio V construction in front.
  • Flat-lock stitching.
  • Progetto X2 Air Seamless seat pad.
  • Weight: 172g.

Free Exchanges: This product qualifies for free exchanges within the first 60 days after order. We'll cover the shipping both ways for US customers if you need a different size and/or color of this product. Returned product must be in new condition with all labels and packaging. Free exchanges apply only for product in stock or available for backorder.


Style Type: Bibs 

Black - Small

Mfg PartNum: L19003010-2 

Black - Medium

Mfg PartNum: L19003010-3 

Black - Large

Mfg PartNum: L19003010-4 

Black - X-Large

Mfg PartNum: L19003010-5 

Black - 2X-Large

Mfg PartNum: L19003010-6 

Black - 3X-Large

Mfg PartNum: L19003010-7 

Dark Steel Blue - Small

Mfg PartNum: L19003070-2 

Dark Steel Blue - Medium

Mfg PartNum: L19003070-3 

Dark Steel Blue - Large

Mfg PartNum: L19003070-4 

Dark Steel Blue - X-Large

Mfg PartNum: L19003070-5 

Dark Steel Blue - 2X-Large

Mfg PartNum: L19003070-6 

Dark Infinity Blue - Small

Mfg PartNum: L19003041-2 

Dark Infinity Blue - Medium

Mfg PartNum: L19003041-3 

Dark Infinity Blue - Large

Mfg PartNum: L19003041-4 

Dark Infinity Blue - X-Large

Mfg PartNum: L19003041-5 

Dark Infinity Blue - 2X-Large

Mfg PartNum: L19003041-6 

Dark Grey - Small

Mfg PartNum: L19003030-2 

Dark Grey - Medium

Mfg PartNum: L19003030-3 

Dark Grey - Large

Mfg PartNum: L19003030-4 

Dark Grey - X-Large

Mfg PartNum: L19003030-5 

Dark Grey - 2X-Large

Mfg PartNum: L19003030-6 

Ordered by Most Relevant First
5 stars
4 stars
3 stars
2 stars
1 stars
Reviewed 8/26/2019
by Mike Hutcheson
Overall Rating
Comfortable to wear & comfortable on the bike!!

First time with the Progretto X2 seat pad - love it. Went with the compression version of these bibs & they are more work to get on, but after 50 miles of pedaling you can tell a difference.

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Reviewed 3/14/2020
by Anonymous
Cycling Enthusiast
San Diego, CA
Value Rating
Overall Rating
Love 'em

Very comfortable and provide good cushion-light weight.

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Reviewed 9/10/2019
by Anonymous
Cycling Enthusiast
Value Rating
Overall Rating
1 of 1 customers found this review helpful.
Nice fit, nice pad

The new pad is very nice, and I like it better than the previous Castelli pads. The fit up front is much better too. Straps are comfortable and work well. I'm 5'7 132 lb and have worn medium Castelli bibs in the past but this one is a small and fits perfectly. Snug, but that's my preference.

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Reviewed 5/20/2019
by Anonymous
Cycling Enthusiast
Anaheim Hills, CA
Value Rating
Overall Rating
A hole in the bib

I ordered 4 of these bibshorts but 1 of them had a little hole near the stitching on the front right leg.

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Reviewed 6/8/2019
by MeesterE
Casual Cyclist
Portland, OR
Overall Rating
Leaves a bit to be desired

I own a couple of Castelli pro bibs and shorts (Nano flex pro, the free aero race shorts and bibs) and would classify myself as more of a casual rider and in my experience using Castelli products, I have been nothing but impressed - not so much with these bib shorts. The fit is typical of Castelli, tight with good compression where it is needed - it's a comfortable fit with seams properly concealed or thoughtfully placed to reduce chafing. The straps, which are touted to enhance airflow, durability, and smoothness against the body are too narrow and end up twisting. The material is too thin and no matter how much I tried to keep them flat, they would bunch up and become uncomfortable on the shoulders - so much so that I mostly ride with the straps down. After my first ride - about 40 miles - I also noted there was pilling in the seat area from rubbing against my saddle - no holes, but still a bit disconcerting given the price I paid for the product. The chamois material and pad is comfortable but interestingly, the material doesn't completely cover pad - there is an area toward the back of the chamois, where you can see the pad and actually move it around. I initially thought the opening was there so you could take the pad out and case you wanted to wash or replace it, but it's sewn into the lycra. The pad still does what it's meant to do, but aesthetically, it's not nice to look at. With all that said, I still wear these mostly for my trainer sessions at home. They're comfortable and the dark steel blue color is a nice change from all the black shorts I have. Still a fan of Castelli, just not of this short.

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Reviewed 4/30/2019
by Persico
Overall Rating
Top of the line bibs

Ive been wearing Castelli free Aero bibs for the past 5 years and every year they improve their shorts that much more.

Cant say enough about the Chamios for great comfort on the saddle and the leg grippers are very compressed and aero and feel like your wearing nothing at all. The only thing I would like to see Castelli improve on these are the shoulder straps. I would like to have a more wider strap that stays flat, these start out ok but seem to narrow around the chest.

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*Orders received before 3:00PM Pacific time are shipped the same day (Mon-Sat). Orders over $50 are shipped free (USA only, excluding AK and HI). Some exceptions apply. See Shipping for details. 66