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Castelli Claudio Men's Bib Shorts

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Item # CST0457

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Item # CST0457


There's a lot that a photo of pro racing can't tell you. Those early-season classics, frequently run in raw weather that would turn us home after only an hour, aren't raced in plain shorts. Those legs aren't bare and those shorts aren't cut from 8 oz. Lycra. The combination of embrocation with thermal bibshorts is a PRO's secret weapon.

Castelli's Claudio Nanoflex Bibshorts appear to be a traditional pair of bibshorts, however, they're cut from Castelli's proprietary Nanoflex fabric used in some of their best tights and warmers. The name comes from tiny nanofilaments of silicone that cause water to bead up and run off as if it were oilskin. It's just porous enough to breathe but provides enough of a barrier to keep you protected from light rain and road spray. Even in a driving downpour it will still keep you warm thanks to its brushed finish inside.

Castelli incorporates their KISS3 pad to maximize the bibs' combination of value and comfort. It features an anatomic shape to conform to your body and ultimately increase your comfort. Unlike most pads found in comparably priced tights, the KISS3 pad features a continuously variable thickness, eliminating the odd sensation of thick here, thin there, that you may have seen before with a dual-density pad. The brushed microfiber cover cuts down on chafing and features a bacteriostatic treatment to reduce the likelihood of saddle sores.

Traditional silicone leg grippers keep the shorts in place at the bottom, while mesh bib straps help transport moisture to the jersey and make sure the waist stays where it's meant to be. Two reflective rear tabs make you more visible in low-light conditions.

The Castelli Claudio Nanoflex Bibshorts come in Black and are available in five sizes from Small through XX-Large.

Tech Specs

Recommended Use:
cold-weather cycling

Size chart

Fuji Bicycles


Geometry Chart


Altamira LTD

Seat Tube


Effective Top Tube








Head Tube


Head Tube Angle


Seat Tube Angle


Bottom Bracket Drop


Chainstay Length



44 44.0cm 51.5cm


36.3cm 72.1cm


72.0 deg 75.0 deg 6.9cm 40.5cm 97.1cm
47 47.0cm 53.0cm


37.0cm 74.1cm 13.0cm 72.5 deg 74.5 deg 6.9cm 40.5cm 97.7cm
50 50.0cm 54.5cm 54.0cm 37.0cm 76.0cm 14.0cm 73.0 deg 73.5 deg 6.9cm 40.5cm 97.6cm
53 53.0cm 56.0cm 56.0cm 37.9cm 78.3cm 16.0cm 73.5 deg 73.5 deg 6.9cm 40.5cm 98.6cm
55 55.0cm 57.5cm 58.0cm 38.9cm 80.1cm 18.0cm 73.5 deg 73.5 deg 6.9cm 40.5cm 100.1cm
58 58.0cm 59.0cm 60.1cm 39.7cm 82.1cm 20.0cm 74.0 deg 73.5 deg 6.9cm 40.5cm


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Here's what others have to say...


Great Bibs

    I live in the Pacific Northwest where the average high temperature is 60 degrees and lower for 7 months out of the year, yet the average low only goes below 40 degrees 4 months out of the year. I was looking for a bib short that could be used when the temperature was too low to comfortably use summer shorts. As it drizzles and rains here for much of the year, I was also looking for something that shed water well in case I got caught out in showery weather. These bibs fit the bill. Matched with the Nanoflex knee or leg warmers, these shorts give me a lot of flexibility in getting the right level of insulation for the conditions.

    These are nanoflex not thermoflex, right?...

    These are nanoflex not thermoflex, right? Same as the warmers meant to go with the Gabba.


    Great bib shorts for the cold

      Let me start with saying that I'm already a huge fan of castelli apparel and these were better than I expected. I just moved back to the Midwest so I had to get something for my winter training and these so far are working great. First time using the kiss3 chamois and it's definitely more comfortable than the chamois in my castelli podium collection bibs. I've rode on these bib shorts about 6 times now and the weather has ranged from 40-60 degrees. No problems in either condition and I think I should be fine riding in them down to 30 degrees. If they keep me warm down to that I'll definitely be purchasing another pair. I'm 160 and 6ft tall and a medium fits perfect. Tight but not restricting.


      What you see is not what you get.

        Bibs pictured are not what you get. Instead,"Nano Flex" is written in big black letters on the left leg, the Castelli logos are blacked out, and there are reflective tabs sticking out on your butt. Otherwise, these are good, comfortable fleece bib shorts that are suitable for chilly rides.