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Assos T FI.Uno_S5 Bib Shorts

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Item # AAS0006

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Item # AAS0006


Assos refers to their FI.Uno S5 Bib Shorts as their "All-around racing and training shorts". Assos takes the hallmarks of the FI.13 S5 and re-engineers them in a way that provides a balance between technical advancement and cost control. They're built entirely of Assos' new A430 fabric, giving you both excellent muscle compression and sweat evaporation. The cutting lines here are less sophisticated as the FI.13 S5, but you nevertheless get superb performance from the fact that the FI.Uno S5 is built in an AEPD design for on-the-bike comfort and has 6 panels to promote muscle support.

The FI.Uno S5 lacks in the curved chamois design of its higher-priced counterparts, but the bib straps pull the chamois into place. And the chamois has the same next-to-skin softness of FI.13 and the FI.Mille, and it also shares the heat-ventilation dimples on the chamois.

The overlocked seams provide cost savings for the FI.Uno, and they have the additional upside of providing excellent elasticity. So you'll save money and be more comfortable. The welded leg grippers are the same story. They flawlessly hold the legs of the shorts in place, but they do so at a lower cost.

If you're looking to experience the handsome fashion and the performance benefits of Assos, but your preference is to do so at a reasonable cost, the FI.Uno S5 is tailor made for you. Yes, it's the least expensive pair of Assos bibs. But if they didn't make fashion sense or technical sense, Assos wouldn't make them. From a bang-for-the-buck perspective, they'll tell you they're the best bib shorts.

The Assos FI.Uno S5 Bib Shorts are available five colors, in sizes Small through TIR.

Tech Specs

yes, FI.13_S5
Recommended Use:
cycling, training, racing

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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Very nice bib!

  • Familiarity: I've used it several times

I own 5 pairs of Assos bibs. Three S2 generation bibs and two S5 generation bibs. I bought a pair of T FI.13 S5 bibs in all black before I bought a pair of T FI.Uno in white/black. Both bibs are medium. I'm 6', 155lbs. The FI.13 fits more snug than the T FI.Uno. I actually think T FI.Uno pad is a bit more comfortable than the T FI.13 pad. The Uno pad is thicker, but never bulky. Just provides enough support. The Uno fits very nice. I have other brand bibs in the correct sizing. Most of them show slight puckering at where the seams go over my rear when I'm in standing position(not riding). The puckering will disappear once I bend over into riding position. So I use this as a gauge for how bib is tailored to my body(not just in riding position, but also standing straight). None of my 5 pairs of Assos ever showed any puckering in the back. That tells me the cut is just dead on. There's only one thing I didn't like about the Uno. It's the inseam. My FI.13 has a 8 inch inseam. My other older S2 bibs are all at 8 inch inseam. I always think 8 inch inseam is the perfect length. However, the Uno has 10 inch inseam. I have relatively long legs(35.5" inseam). The Uno just looks way too long. If you go by OREC, the bib shall not extend beyond 2/3 of your thigh. Uno is about 3/4 of my thigh if not more. So the Uno is too long. I took my Uno to a tailor, hemmed at 8 inches. Problem solved. They're perfect now :)

Very nice bib!

Very disappointed

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

I bought my bib in January 2014 after washing in cold water gentle cycle the back mesh has come apart. I figured I try out the low end bib just to see what all the hype is about but only to be disappointed. I have bibs that are cheaper example a Pearl in r cool and never had a problem like this. I would say I got a bad bib but I also had issues with assos early winter gloves that I had to take to my local cleaner to be repaired. I will be waring Capo and Rapha from now on. I can say the packaging was very nice.

Don't like 'em

  • Familiarity: I've used it several times

OK, so they have great materials, are made well and fit like a second skin-all good. I just don't like the chamois. The seat is good-just the right amount of padding. It's the front of the chamois that I don't like. It's too wide and too bulky-not a conforming fit like most other manufacturers use. I like Sugoi, Hincapie and Pearl Izumi product much better and at a fraction of the cost. These shorts have a lot of cachet, but cachet won't help you 50 miles down the road when they become uncomfortable to your manhood. I think bibs are very personal and this one just doesn't work for me. Voted 'Likely to be seen on eBay soon'

Follow up: They're gone-thanks eBay!!

I am 6', 170lbs with a 39" chest. Which...

I am 6', 170lbs with a 39" chest. Which size should I get?

L. Reasoning: These shorts run just slightly snug and I think M would be just a tad confining for your build, especially the length of shoulder straps. I am 6'2" and 180 with 44 chest. L is snug and straps any shorter would be too snug. Chest size not too important with bibs; so Gould have no problem.

I'm 6'1", 170, 40" chest, wide shoulders, and wear a medium in assos bibs. If you're built like a bike racer they should fit fine. The straps will be tight when standing but perfect in riding position.

L: I'm nearly the same measurements (6'0.5", 168lbs, 39" chest, 32 waist) and have enjoyed the S5 Unos for over a year. The straps are starting to get loose, but I appreciate the non-compressive front. Legs and stomach are where the compression is needed and these deliver the right amount.

Ready to get back in the saddle!

  • Familiarity: I've used it several times

Riding I do: I currently ride 50+ miles a week on the unpaved, dirt roads of Catalina Island. I was exclusively a road cyclist for the 17 years that I lived in San Francisco before I moved to the island.

Me: 5'9" 155 lbs

Review: Riding trails and dirt roads for me, is a lot tougher than the road riding I was used to. There's a lot more vibration, inconsistency to the surfaces and as a result muscle fatigue. I found that the shorts that I was using weren't getting the job done so I started looking around and found these on sale. I've now been out on 6 rides with these and I can say that they are the best that I've ever owned. Other brands that I've used are Pearl Izumi and Voler which were fine for road riding. I've been able to ride three straight days (total of 6 rides now) without any soreness while before I was feeling the pain on just a single ride. The quality of the materials and pad are the best I've owned. I can stay in the saddle while climbing and descending without a problem on the dry, dusty and bumpy trails of Catalina now. There aren't many "flat" sections out here but I can handle hose too now thanks to my Assos F1 Uno!

Also, a shout out to Sara L from Competitive Cyclist! I incorrectly entered my address (doooohhhhh!!!) for shipping and she was on top of getting it corrected even though the product had already shipped (caught it within 20 minutes of placing the order). She was friendly and helpful and even followed up with an email a couple days later to make sure it arrived. Awesome customer service! Thank you!

My backside says these are the best

  • Familiarity: I've put it through the wringer

I ride a lot of trainer miles indoors, and these shorts are comfy, durable, and all around awesome.


  • Familiarity: I've put it through the wringer

I have tried numerous shorts and bibs, this one by far is the most comfortable one I have under the $250 range. The fit is great, one simply forget about it during long rides, it is that good!

Assos ,5 stars on bibshorts

  • Familiarity: I've used it several times

I now have 4 pair of assos. 2pair shorts and 2 pair of bibshorts. i'm 5'9" 210 (on a good day)

purchased xxl, by far the best fitting most comfortable bibshorts I've ever owned.