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Castelli Ergo Bib Knickers

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Item # CST2478

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Item # CST2478


When you're prepared, the shoulder seasons can be the most enjoyable times to ride. The weather is moderate, the sun is usually shining, and the roads are clear for cycling. However, wearing your summer bib or winter pants are going to leave you either soaked in sweat or shiveringly cold. When you need a little 'oomph' for the season, the Castelli Ergo Bib Knicker is ideal. With a three-quarter leg covering made from proprietary materials, the Ergo Bib Knicker provides the right amount of warmth without sacrificing its race-day fit.

Castelli's Ergo Bib Knicker uses a multi-panel construction that's made from the exclusive Affinity fabric. This material provides a slight compression that helps to reduce muscle fatigue by increasing blood flow. Just as important for long hours in the saddle, the Affinity fabric is highly breathable and it wicks moisture efficiently to its quick-drying surface. And while staying dry is crucial, so is the freedom of movement. To ensure this, the Ergo uses an eight-panel design that promotes full articulation and muscle support throughout the cycling movements. The fit is further complemented by the incorporation of a breathable mesh upper and straps.

The Ergo Bib Knicker has you resting on Castelli's Kiss3 Chamois. The chamois adapts prominent features of the pro-level Progetto X2, like a seamless construction and a brushed microfiber surface layer. This reduces skin-friction and abrasion, and the Kiss3's Bacteriostatic treatment mitigates the threat of saddle sores or infection. For prolonged comfort, the Kiss3 uses a variable thickness pad with maximum padding placed at the ischial zone for support, and minimum thickness at the perimeter to minimize chafing.

The Castelli Ergo Bib Knicker is available in sizes from Small to XXX-Large, and in the color Black/white stitching.

Tech Specs

[body] ThermoFlex, [straps] mesh
yes, Kiss3
Recommended Use:
cycling, training, racing
Manufacturer Warranty:
30 days

Size chart


Men's Apparel
 Small Medium Large X-Large 2X-Large 3X-Large
Chest  35.5 - 37in
(90.2 - 94.0cm)
37 - 38.5in
(94.0 - 97.8cm)
39 - 41in
(99.1 - 104.1cm)
41 - 43in
(104.1 - 109.2cm)
43 - 45in
(109.2 - 114.3cm)
45 - 47in
(114.3 - 119.4cm)
Waist 29.5 - 31.5in
(74.9 - 80.0cm)
31 - 33in
(78.7 - 83.8cm)
33 - 35.5in
(83.8 - 90.2cm)
35.5 - 37.5in
(90.2 - 95.3cm)
38.5 - 40.5in
(97.8 - 102.9cm)
41 - 43in
(104.1 - 109.2cm)
Hips 36.5 - 38.5in
(92.7 - 97.8cm)
38 - 40in
(96.5 - 101.6cm)
40 - 42in
(101.6 - 106.7cm)
42 - 44in
(106.7 - 111.8cm)
44 - 46in
(111.8 - 116.8cm)
46 - 48in
(116.8 - 121.9cm)
How to Measure:
For best results, take measurements over your underwear.
Measure under your arms, around the fullest part of your chest.
Measure around your natural waistline, keeping the tape a bit loose.
Measure around the fullest part of your body at the top of your legs.
Using pants that fit well, measure the crotch seam to the bottom of the leg.

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Here's what others have to say...


Not bad for the price

  • Familiarity:I've used it several times

PROS: The fabric fits me well, even after four washes. They're comfortable and they look good.

CONS: They're a little long and, man, the pad is super thin. Not the most comfortable shorts.

VERDICT: Change the pad and this would be a winner.

Unanswered Question

Do these knickers have insulation? I'm...

Do these knickers have insulation? I'm looking for a pair with no insulation built into them.


Fell apart after 2 washes

  • Familiarity:I've used it several times

The fit is consistent with previous size M from Castelli that I've purchased. Unfortunately, I have been consistently disappointed with the brand. The design and comfort are great but the quality of these bibs in addition to almost every piece of Castelli gear I've purchased is very poor. The stitching for the chamois came apart after two washes. Ugh.

Regarding care: I use a front loader washer on gentle cycle and never, ever use a dryer -- only hang dry.

you must not be very nice to your kit as I and many of my fellow freinds swear by castelli and is our kit of choice you should learn to look after your stuff

love my castelli Espresso Due jacket as well. Very good to me.

Had the same experience with these bibs, however I reattached the liner and have worn them as my go to bibs with baggies for 2 winters of mtb. Agree the liner is thin , but still works for long rides.All my other Castelli gear has held up great


Great 3/4 bibs

  • Familiarity:I've used it several times
  • Fit:Runs small

First pair of Castelli knickers, definitely dig them. Seem a big longer than I expected but I have short legs too. Paired up with a Gabba Jersey and it's a great kit. Bought a size larger based on feedback with Castelli sizing, was good advice.