The Mille GTO S11 shorts are the latest iteration of Assos’ top-spec pair of shorts in the Mille comfort range, which feature in CW’s guide top the best bib shorts.
As with all top-of-the-range Assos products, the shorts feature an enormous host of proprietary fabrics with names only the Assos marketing department could concoct. So, let’s get listing exactly what the difference between a kukuPenthouse and OSSIDIA are.
Image 1 of 2
Construction
Starting from the hem of the legs up, we have the Inject leg grippers around the raw cut leg hems. These are more open than a traditional solid silicone band and claim to improve airflow around the leg while providing plenty of grip.
This is fitted to the OSSIDIA material used across the main body of the legs and designed to ‘wrap your large muscles in silky-smooth compression’, as it states on the website. It uses warp-knit construction for an incredibly thin yet supportive material. Moving up from here the cranKio Tec darting around the hips prevents any bunching of the material throughout the pedal stroke.
As we get to the waist, LOSANGA material is used across the crotch, which is non-compressive to reduce pressure and allows for greater airflow. This is paired with the famous kukuPenthouse chamois relief channel designed for male anatomy. The waist area here is also low pressure, or zeroPressure waist as Assos refers to it, making nature breaks easier and limiting constriction around sensitive areas.
The straps have been revamped to be thinner in construction, similar to those used in the Assos Equipe RSR Superléger S9; rollBar is the extended strap which gives it two attachment points at the rear to keep the chamois in contact with the body while pedalling both in and out of the saddle.
Image 1 of 2
The chamois has many features. It starts with the GTO S11 insert, a dual-layer 21mm pad with additional support under the ischial bones, commonly referred to as the sit-bones. It feels similar to a dense memory foam. The pad is suspended with goldenGate 2.0, where the pad is attached at the front and rear, but floating in the middle so that it remains in contact with the body to eliminate friction. kraterCooler are the large perforations at the front of the pad to allow greater air cooling and reduction in humidity, while whirlKrater are the perforations across the body of the chamois, apparently creating a whirlwind of cooling air.
Standard and Long leg lengths are available, with a 3cm difference, while just black is offered as a colour option. Sizes range from XS to 3XL.
The Ride
While they are comfortable once on, there is nothing that really stands out about the Mille GTO shorts pre-ride. That all changes when you hop on the bike and becomes more apparent the longer you ride for.
The features such as the raw cut hems and new grippers work well, while the zero pressure waist does make for a comfy fit. The straps are also effective. It is only when you get into the riding position on the bike that all these features and elements really start to make sense though.
The legs stay in place well, even over stubble or hair, while the cranKio darting really does eliminate any folding of fabric around the hip during the pedal stroke. This removes elements of discomfort I often have come to associate with simply riding for longer duration, and over the course of a few 5+ hour rides, it was noticeable just how comfortable the Mille GTO were relative to other shorts.
Riding in the shorts, the longer I went the more comfortable they felt relatively
(Image credit: Future – Andy turner)
This is further exaggerated in warmer weather. The compressive yet impressively breathable OSSIDIA material works wonders as it gets hotter, while the lighter strap construction and LOSANGA material at the front of the shorts really help with temperature regulation.
The more breathable panels at the front of the shorts also compliment the perforations within the chamois pad. There is a noticeable level of airflow at higher speeds and when you get out of the saddle. This will have the effect of reducing moisture in that environment, which in turn will help with hygiene and limiting gripes such as saddle sores.
The Mille GTO pad itself is fantastic. I have been a bit fan of the Mille seatpads for a while, and this latest iteration feels fairly similar on first impressions, but again, as you ride it makes more sense. The higher density material in the pad really comes alive once you get into longer rides, or ride on rougher road surfaces. Vibration dampening is second to none and, as with other features, limits the rate of decline in comfort compared to a lot of competitors. Having the centre of the pad somewhat free to move also means that there is far less chance of having your body move across the pad which can lead to friction and irritation. Instead, it does move with the body how Assos intended.
You can actually use the lower portion of the straps to shove a rolled up jacket under
(Image credit: Future – Andy turner)
I like the lower secondary attachment point on the straps that is used across the Mille range of shorts and tights. I’ve actually found it useful as an external pocket for stashing lengthways a waterproof or jacket when not needed to free up pocket real estate.
Value
Undoubtedly, £295 / $410 for a pair of cycling shorts is a considerable sum of money. The Mille GTO S11 are an exceptionally good pair of shorts, but Assos has now trickled down a lot of the great technologies and functionalities, which actually causes a bit of a headache for the GTO shorts.
I’ve tested both the Mille GT and the GTS, and the GT are my second favourite in this range, very close to the pinnacle GTO shorts. The pad features the same floating structure, the materials are comfortable, and the strap design is very similar. The grips are not as effective, and in hotter weather it’s perhaps not quite as breathable, but it’s close. It also comes in a broad range of colours which I personally am a fan of. The biggest issue for the GTO however, is that the Mille GT shorts are just £135 / $210.
Comparing the Mille GTO with the Rapha Powerweave, Q36.5 Dottore, and other ~£300 shorts, the Mille GTO are now my favourite for longer warmer rides. But spending my own money, the Mille GT offer so much of what makes the GTO a great long ride pair of shorts, but for about 45% of the price. The gulf between the two in price is huge, but the gulf between the two in terms of performance is barely a small stream you can step over. It extends in excessively warm weather or very long rides, but for most people, the Mille GT will be an exceptional pair of shorts for potentially one of the best value offerings out there for cycling bib shorts.
This darting is an inspired idea that really boosts long ride comfort
(Image credit: Future – Andy turner)
Conclusion
The Assos Mille GTO S11 bib shorts are fantastic. It’s not that the baseline performance is standout, but rather the rate at which they continue to maintain comfort over longer rides and warmer conditions. Whereas competitors may start to deteriorate in comfort, the GTO maintain their performance level. The problem though, is that many of the features that make them so great have trickled down to the significantly cheaper Mille GT shorts, which themselves offer possibly the best value bib shorts on the market currently.
