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Assos tK.607_S5 Bib Knickers

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Item # AAS000W

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Item # AAS000W


When tights are overkill, but shorts leave your knees cold, the Assos tK.607_S5 Bib Knickers are the simple solution. Insulated to keep your muscles and joints warm, the tK.607_S5 provide the same plateau of Assos quality as the summer-weight T.607_S5 — only now you get the pinnacle of cool weather protection.

Assos' tK.607_S5 bib knickers use a combination of Assos' exclusive RXQ and stratagonUltra fabrics. The bulk of the construction uses the RXQ insulating fabric which uses a 3D air channel structure. This open structure creates a micro air cushion between the skin and the fabric. And while this creates an insulating layer that's capable of retaining your natural body heat, you won't drown in sweat in the same way that you do with other fabrics. This is because RXQ is a low-density, low-volume fabric, and its breathability keeps your core dry and your temperature regulated. At the abdominal and inner-leg areas, Assos placed its windproof stratagonUltra material. This takes the bite off of chilly winds, which Assos explains, oddly enough, reduces your 'need to pee.'

As impressive as the Assos fabric lineup is, the true Assos signature is its precision fit. Utilizing what Assos calls its Advanced Ergonomic Pattern Design (AEPD) racing cut, the tK.607_S5 benefits from the most thought out designing process in the business. Assos is the first to tell you that high-end materials mean nothing if the cut is bad. That's why it's spent a maddening amount of time on two points of study — how the body is shaped, and how it changes throughout the movements of cycling. Accordingly, the AEPD cut is made for the shape of cycling, not standing (just a little something to remember when you try them on). With the tK.607_S5, the cut greets the contours of your body and adds a slight compression that aids in muscle stabilization. It's worth noting that AEPD achieves this without adding a sensation of pressure. Further along these lines, the leg grippers use a no-pressure elastic. To achieve this gentle grip, Assos integrated them with the fabric of the knickers instead of placing them inside the hem. Altogether, the characteristics of AEPD literally make the knickers 'click' into place for the ultimate in cycling fit.

The tK.607_S5 has been given the Assos exclusive FI.Mille_S5 elastic interface chamois. Now, you've probably heard of CyTech's Elastic Interface Technology, but guess who's engineers spearheaded the project? That's right, it was Assos. Designed to follow the body in motion, the FI.Mille_S5 uses a variable density throughout the chamois to support the regions that need the most support, without impacting the ones that don't. The support focus is primarily placed at the perineal, ischial, and gluteal areas — the points most prone to distress from saddle pressure and compression. With its anatomic design, the FI.Mille creates an abrasion-free support that promotes an increased circulation by protecting nerves like the pudendal. Further along these lines, FI.Mille's waffle texture also works to dissipate any buildup heat. Even more impressive, the insert is road-specific. Assos engineers realize that saddles and saddle positions vary throughout different disciplines of cycling, and the insert's chamois density patterns are mindful of the specific pressures of road cycling.

The Assos tK.607_S5 Bib Knickers are available in the color Black Volkanga and in six sizes from Small to TIR.

Tech Specs

[knickers] 68% Assos RXQ nylon, 17% polyester, 13% elastane, 3% polyester mesh, 2% carbon fiber
form fit
yes, FI.Mille_S5
Chamois Thickness:
Removable Chamois:
spring, fall, winter
Recommended Use:
early winter road cycling
Manufacturer Warranty:
limited lifetime

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 kit!

  • Familiarity: I've put it through the wringer

Love these bib knickers. Yes they are pricey, but they or SO comfortable, extremely well made and look great. I'm 6'0" and 190lbs and found an XL fit perfectly.

Avg. ride time: 2h 35m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Hard to step down now...

  • Familiarity: I've used it once or twice and have initial impressions

Gasped at the thought of dropping this kinda of money on knickers but after wearing middle of the road LG and PI's I decided to step up. Trevor helped me with sizing and didn't try to up sell but basically said, they all wear them and love them AND they got them to me in two days! I'm 5'10 and fluctuate between 180 and 205 and they are at my weight limit right now and still feel great. They should fit even better as I burn off my winter weight. The S5 chamois is thick but wow what a difference in what I'm used to wearing, absolutely no soreness or irritation. I knew the quality was gonna be top notch as I bought some of their socks and sock liners. I tend to run hot so 60F is my max for these. They only problem is now finding shorts that are this nice, time to make room to move into the "kukupenthouse" with the S7 they offer. Thanks again CC and Trevor for hooking me up

John, size L. They are snug but not too tight

Awesome Cold Weather Knickers

  • Familiarity: I've put it through the wringer

This knickers are extremely comfortable and fit like a glove with all the panels. The chamois is perfect and the stay in place with no movement. The fabric they use is very soft and compressive but also stretchy. They are not windproof (don't claim to be) so if you run really cold or are doing low effort workout might be too cold below 45. The only con is the high price but no other knickers including capo and rapha come close. I finally decided to quit wasting money on any other bottoms and only buy assos, they are an investment in your most important assets your body and health; or at least that that's what I tell my wife.

Avg. ride time: 2h 2m 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 used it once or twice and have initial impressions

Me: 6'2", 160 lbs, 31 in waist.

Large fits very well.

Pro: impeccable finish, fabric is so soft and plush that my wife thought these were natural fibers (think cashmere), fit is "race-cut" (good for my body shape), warm enough into the 30's

Con: Chamois is giga-thick (think ultra absorbent diaper), calf gripper are not sticky so they ride up.

First purchase from Assos. I expected perfection but got something else. Will update review once I ride with it a few more times.

Not sure where this is coming from no problems what so ever no riding up when they 1st came out quick hit & walk around the house then washed to take to the Seagull Century in Salsbury MD. picture perfect the chamois is the long distance one on point not so on point the S7 chamois..another nice did it twice when the lighter weight version for early fall/spring purchased them as well dead on comfrot,Kevin Ware