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Dessus new zipless aero jersey: is this really the “fastest” jersey out there?

British brand says its aero jersey has been tested out on the road with Body Rocket’s on-board drag technology

Yorkshire based Dessus has refined its aero jersey and claims that it is the equivalent of 4-8 watts faster than the market leading aero jersey at 40 km/h (25mph) and the equivalent of 8-16 watts faster than a standard jersey, confirmed by testing with British aero data tech developers Body Rocket.

2021 Dessus aero.21 jersey 1

The new Dessus Aero.21 Jersey is a zipless design with rear pockets that are said to have less of an aero penalty than usual when loaded up with snacks and valuables.

2021 Dessus Aero.21 Jersey Nero(1)

Tests were conducted with Body Rocket’s on-board aero technology that claims to give real-time wind tunnel data to riders out on the road.

2021 Dessus Aero.21 Jersey Nero back

The Brighton-based tech company recently partnered with BMC, as we reported last month, to refine the accuracy of its device on the Swiss brand's bikes. Dessus tested its jersey with Body Rocket technology in the “late prototype phase with release looming”, according to the Yorkshire clothing brand.

Is this reliable enough?

“The thinking behind using this tech rather than a traditional wind tunnel is that if kit is designed to be raced on the road then it should be tested as such; races are won and lost on the road,” Dessus says.

Tests were conducted around a track in a crouched position, hands on the hoods. Dessus says that this is “the most common riding position in a long road race and therefore the most ripe for valuable improvements”.

Aside from the jersey, all other items of kit such as shorts, bike and helmet were identical for each test.

Results by Dessus and Body Rocket show that the refined Aero.21 jersey was 4-8 watts faster than a market leading aero jersey and 8-16 watts faster than a standard jersey. If you object to the phraseology, you'd have to put out that much less power in order to achieve the same 40 km/h (25mph) while wearing the Aero.21 jersey, according to these results.

More aero gains can be found with the two integrated rear pockets which, as well as being redesigned for ease of use, are said to be “less aerodynamically affected by their contents”.

2021 Dessus Aero.21 Jersey Nero pocket

“The Dessus jersey design changes only 2% with contents in pockets vs a standard jersey, which sees a 5% increase in drag with contents in the pockets,” Body Rocket says.

The table below is a full data breakdown found on the Dessus website.

2021 Dessus Aero.21 jersey test data table.JPG

The jersey also features a new waist gripper to ensure added security of fit.

2021 Dessus aero.21 jersey 7

The sleeve design is said to be “a nod to the countless hours of testing in the Wharfe Valley” and is based on the topographic contours of the area.

2021 Dessus aero.21 jersey 4

The Dessus Nero Aero.21 jersey costs £120 and is available in Nero (black with red highlights), Rosso (red) and Azul (light blue).

2021 Dessus Aero.21 Jersey Nero azul

Does this zipless aero jersey appeal for gains or is it impractical aero faff to you?

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froze | 3 years ago

8 to 12 watts increase just by wearing their jersey?  Bull Schit!!!!   If this is true then the average speeds at the TDF should increase each time some company comes out with something new that gives the rider and additional free watts, but we're not seeing those increases at the TD, in fact, over the last 60 years the average speed has only gone up by about 2 miles per hour, but the main reason for that speed increase is that the daily rides have gotten shorter, so the TDF race is 300 miles less than it was 60 years ago.  All this technology from steel bikes to CF bikes, to aerodynamics, has done nothing!  And yet we're supposed to believe that some jersey you're wearing is slowing you down so you better buy this fancy expensive one.  LMAH!!!

We've only had one speed spike at the TDF in 2005 but that was only good for 1 km/h, and that was because everyone was doping.  In 1960 the average speed was 37 KM/H, or 23 mph over 2,573 miles, in 2014 it was 40 km/h or 25 mph over 2,270 miles.   All done over 21 stages.

If you want me to believe all this saving watts crap is for real then you need to show the proof at the TDF, according to my best estimates all the watts that the industry is saving from aero bikes, helmets, shoes, pedals, jersey, rider position, etc etc etc we should be doing at least 5 mph faster than in the 60's.

We're just buying into the traveling medicine man show.

andystow replied to froze | 3 years ago

Here's why they're stating it that way. Neglecting rolling resistance (close enough at their speeds) then power is proportional to speed cubed, hence speed is proportional to the cube root of power. I'll use round numbers, 8 W at 40 km/h, but really it's 8 W at 350 W, so let's call it effectively 358 W.

40 km/h x (358/350)^(1/3) = 40.3 km/h.

That's meaningless to you or me (who in any case would gain more like 0.0something km/h at 25 km/h) but would certainly make a difference in a time trial. If real.

Note that they give a range, but no indication that they did multiple trials and that the results are statistically significant. Was the air temperature higher when they ran their new jersey? Pressure lower? Humidity higher? Was it a perfectly windless day?

Cyclespeed Tours | 3 years ago

Shame they can't export any to Europe without loads of fees and taxes....otherwise I might be interested.

Gkam84 | 3 years ago

As tested with the Body Rocket system....That was was enough for me to ignore.

Welsh boy | 3 years ago
1 like

When are you going to stop writing this BS?  Please get someone who knows what they are talking about to write these articles, something CANNOT be X Watts faster, the Watt is NOT a measurement of speed.  Writing things like that just destroys all credability of everything else in the article, it really just points to the review being a manufacturer's worded advert and not an independent review of a product.

mdavidford replied to Welsh boy | 3 years ago
1 like

I'm sure when I first saw this it had a bit that said 'if you have an issue with those units, here's what it actually means', but oddly it seems to have been edited out.

Compact Corned Beef replied to Welsh boy | 3 years ago
1 like

"If you object to the phraseology, you'd have to put out that much less power in order to achieve the same 40 km/h (25mph) while wearing the Aero.21 jersey, according to these results."

That seems pretty clear to me.

mdavidford replied to Compact Corned Beef | 3 years ago

That's the one. For some reason I just couldn't see that at all when I was looking for it earlier. sad

Yorky-M | 3 years ago

Can i hear you say jeasus, jeasus was sent to save your souls,

sparrowlegs | 3 years ago
1 like

I've got one of the gen1 Dessus jerseys. It's a really well made jersey, fits great (despite me having a bad shoulder that wants to pop at every movement) and the only compromise for me are the rear pockets but it's no big deal. 

I think design is genuinely something different, it's not a massive name but it's designed here in the UK and the fact it boasts aero benefits is a bonus as I'm always chasing my own PBs.

mbprouser | 3 years ago

I'm pretty the UAE team had something like this a while back.

peted76 | 3 years ago

So it's a t-shirt then.

Sounds like they could have saved a lot of time by adding the word 'tight' before the word 't-shirt'.  

Seagull2 | 3 years ago
1 like

Read great piece once upon a time, and for the bog -standard cyclist like me, with avg speed 14-16 mph over 30 -60 mile spins, there are only 2 things that make a significant difference to the time it would take me to cover 25 miles / 40 km - 1. more training, ie get fitter and stronger  and 2. a more aero position   ie tri bars  - -            A 3 kg lighter bike might save me 20-30 secs, an aero bike something similar  ,  dunno about an aero jersey but can't imagine I'm going anywhere near fast enough for it  to have a tangible benefit. Anyway, i'm getting older, so I have come to terms with the fact all my PBs are set in stone,  and  now i concentrate on enjoying myself on the bike 

andystow replied to Seagull2 | 3 years ago

For a quick SWAG at the power saved at lower speeds, use the cube of the ratio of speeds.

16 MPH / 25 MPH = 0.64


0.262 x 16 W = 4.2 W.

Steve_S_T replied to Seagull2 | 3 years ago

I feel the same way Seagull2, although I live in hope with regard to PBs. In all honesty those maximum gains only apply to top pros, the law of diminishing returns applying to the rest of the road cycling world, although the "negligible benefit" group would be by far the largest, whether folk care to admit it or not. 

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