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Item # AAS0154

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Item # AAS0154


Assos' LL.bonKa_s5 Bib Tights are similar to its LL.bonKa_s5 Tights, with anatomic shaping of the Roubaix and Roubaix Q fabric panels, but they increase the cold-weather comfort by adding Stratagone wind/waterproof material to exposed frontal portions of your legs. The total garment weight is hardly more than the LL.607 version, but the performance effect in winter's worst conditions is well worth the difference.

Assos gives the S5 Bib Tights the FI.Mille_S5 Chamois. It's curved to perfectly fit your body, and it has a built-in channel in the pad to reduce genital pressure. In addition, it has the same softness and heat-ventilation dimples of the FI.13 chamois. Assos gives it the 'Long Distance' designation as it has more surface area than the FI.13, it stretches less than the FI.13, and it has a stabilizer built into the chamois, causing it to move less during your pedal stroke. One aspect of the FI. Mille chamois that we like is that the front portion is cut high enough to prevent "podium bulge" for those moments you'll be spending off the bike in the cafe or general store.

You'll find the LL.bonKa_s5 Bib Tights use windproof material down the front of the thigh and over the knee. Another panel is strategically located at the top of the crotch to shield you from icy cold winds. Aside from the four-way stretch wind/waterproof fabric, they use a combination of super soft Roubaix and Roubaix Q fabric. Roubaix is a thicker-than-average Lycra with a wonderful microfleece interior. It provides the kind of warm fuzzy feel that can be the difference between soldiering on or turning back for home when the weather is cold and bleak.

The panels that line the seat area and inner leg are Roubaix fabric. The outer portion of the legs and the back of the knee use Roubaix Q, a fabric that starts life as Roubaix. Then a waffle pattern is cut into the microfleece interior of the fabric. The reduction in material doesn't decrease the warmth; however, it does decrease the weight and bulk in comparison to standard Roubaix. This is especially important at the knee. The lighter Roubaix Q material won't bunch and chafe at the back of the knee when you pedal.

The Assos LL.bonKa_s5 Bib Tights are Black and come in six sizes from Small to TIR. The bib uppers have a large mesh insert in the back for maximum ventilation and stretch. As is often the case with Assos, a few small details make the difference; they have foot stirrups to hold the legs in place throughout your ride, and an 18cm zipper is used in the front to facilitate natural breaks. The long zipper is integral into the narrow design of the front portion of the bibs. The reason -- to eliminate any potential for nipple rub on those cold, windy days that eventually lead to chafing. In addition, the narrower origin for the bib straps allows for a more even distribution of pressure over the shoulders, especially when wearing a few layers.

Tech Specs

Roubaix Q
yes, FI.Mille_S5
Removable Chamois:
Recommended Use:
winter road cycling
Manufacturer Warranty:

Size chart


Men's Apparel
Leg & Knee Warmers 0 I II
Height 4ft 11in - 5ft 2in
(150 - 159cm)
5ft 3in - 5ft 6in
(160 - 169cm)
5ft 7in - 5ft 10in
(170 - 179cm)
5ft 11in - 6ft 1in
(180 - 185cm)
6ft 1in - 6ft 3in
(186 - 190cm)
6ft 3in - 6ft 5in+
(191 - 195cm+)
XLG but wider
Arm Warmers 0 I II
Chest 35.4in
46.5+ in
How to Measure:
For best results, take measurements over your underwear.
Measure around the widest part of your chest.

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Great product

  • Familiarity: I've put it through the wringer
  • Fit: Runs small
  • Size Bought: XLarge

Very warm and fits like a second skin, great sale price to.

Yeah, they are that good.

  • Familiarity: I've used it several times
  • Fit: True to size

I bought these to be worn while I am riding my fat bike so keep this in mind when you factor in the wind chill equation.

You do not feel these bibs on you while you ride—you have them on but they are not there. They fit great, work great and are a bit tougher than I thought. I have worn mine in temps between 0°-35°—when it gets lower than 10° I use a thin lycra knee warmer and a longer wool sock to stay warm. I tend to have good circulation so I stay warmer than most people.

I have taken one or two bad spills on these bibs and they held up fine when sliding on my back side down an icy hill without a blemish.

Best ever winter tights?

  • Familiarity: I've put it through the wringer

I have a pair of older 607's that were "warm enough" down to temps around 28-30 degrees F. These tights are quite a bit warmer. Extra insulation covers the bladder area and the fit is sublime while riding, as with all Assos kit. I use these tights down to 20 degrees F with howling winds and noticed at most a slight chill at the end of a 2 hour ride. Assos makes an even warmer tight that incorporates a vest but I can't see how my legs would be any warmer. The fabric is windproof in the right places and breathable where it needs to be. They were much lighter than I expected. Going on my second season with them and have no complaints. Fit is exactly per the Assos sizing guide as far as I can tell (I am 66.5 inches and wear medium tights, but could probably go with a small as well when in summer race shape). Every single piece of Assos gear I have bought starts off with a conversation about it being too expensive, but I am never disappointed. They replaced a pair of worn out PI Amfib tights and there is no comparison. If I hand wash after a ride and let drip dry, they are ready to go the next morning.

Avg. ride time: 10h 4m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.


  • Familiarity: I've put it through the wringer

Like everything else Assos, these are remarkably well engineered.

Rode them all Winter and cannot believe I was concerned about purchasing them in the first place. There is nothing that ruins winter more than being cold all the time.

If you are a serious cyclist, and are serious about training outside over the winter, get these. There are warmer models, but if you are active these will be warm enough - any warmer and you will probably be a pool of sweat. I used them from -10 C (14 F) to +10 (50F) (wouldn't go warmer) in blowing wind, snow flurries and ice rain. Warm in the winter - what a concept!

They wash well and dry quickly - good enough for daily rides.