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The key to understanding how the Win Wing works lies in physics: water and mud leave the wheel in a straight line from the tangential point of release. By shielding only the upper rear quarter of the wheel, the Win Wing eliminates spray from reaching the critical areas of the rider with a minimum of material. By shielding only the upper rear quarter of the wheel, the Win Wing eliminates spray from reaching the critical areas of the rider with a minimum of material.” While bikes of old all had a lot more symmetry, a number of modern bikes tweak their stays side-to-side a bit to either maximize tire clearance around the drivetrain or to fit a disc brake caliper into the rear end somewhere tidy. Ass Saver have produced a great new product in the Ass Saver Win Wing. Great for your gravel bike, easy to attach and won’t mark your seat stays… This is not really a fender for everyone. Some don’t like the look of this gray recycled plastic loop hanging over your rear wheel. Some really need the total protection of proper full-coverage fenders. And some – like our own Editor-in-Chief – would rather have a wet butt than nasty muddy water bottles. And those are all valid concerns.
It’s so simple that it makes you wonder why it didn’t already exist. And, at the same time, its clever and minimal design leads you to admire the thought process and engineering that went into it." I later realized I’d positioned the Win Wing a little high. Ass Savers recommends that you “aim for 5-10 mm tire clearance” for the Tangential Coverage to work properly. That’s very close to the tire. As you can see in several of these photos, the bike I was testing it on happens to have mounts at just the wrong place on the seat stays. This prevented the Win Wing from being repositioned into the perfect spot. I tried it on a different bike the next day, and moving it a little lower seemed minimize forward spray, although conditions weren’t nearly as wet. Either way, the ass-saving function of the Win Wing makes it well worth it. Thanks to its sophisticated simplicity and careful choice of materials, the Win-Wing is virtually indestructible. With only four components (competitors use as much as 40 components) it's not that much that can go wrong. The glassfiber reinforced wishbone holder is both flexible and tough and the rubber straps are virtually indestructible. The elastic in the attachment straps makes it easy to get a good, secure fit (Image credit: James Watkins) Performance
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For the Tangential Coverage to work properly, the mudguard needs to be installed very close to the wheel. Aim for 5-10 mm tire clearance for maximum coverage. And, there simply are few fender options with big enough coverage for mountain bikes. Modern knobby 2.4″ trail tires (61mm) push this fender a bit beyond its limits, but essentially anything smaller than that fits fine, offering plenty of room for most XC bike tires. Extra benefits, too… Just as important as a tight fit is the angle of the blade. There are three different settings to compensate for the angle of your seat stays. Choose the one that allow a horizontal or a tail-up position. Avoid a tail-down angle as this will reduce the efficiency of the fender.
There’s also a slot on one-side to secure a zip-tie around it, not to keep it from falling off, but as a mini anti-theft feature for when you leave your bike unattended. Ass Savers Win Wing – Pricing, options & availability It looks minimalist (it weighs only 72g, or 64g for the Road version), but by harnessing the principal of ‘tangential coverage’, the level of rear-end protection is impressive. The Win Wing looks strange at first glance. I am an avid user of the basic Ass Saver (a plastic flap that basically slips under your saddle and as the name suggests, saves your ass) but the Win Wing’s design is really taking things to the next level. If you are just looking for a lightweight, simple solution to keep your butt clean & dry ( or a bit drier if you ride in constant rain) on road, gravel, or cross-country rides… then, the Win Wing is a good option to consider. And if you want to keep mud off your dropper post, that might just be a very welcome added bonus, too.These two gentlemen could not be any more accommodating if they tried, quality service that is a rare find in today’s crazy world, I can not recommend this company enough! We researched other brands and found that they were appalling quality straight out of the box and often more expensive too.
And who would have suspected that this road & gravel fender is perfect for protecting your dropper seatpost? This might be my favorite surprise in mounting the Win Wing. The more dropper posts expand beyond mountain bikes, the more riders will have to deal with maintaining droppers. During the R&D phase, Ass Savers found that water does not spin off the wheel through the full radial cycle but rather comes off at a tangent that, of course, is aimed right at the saddle. As a result, it’s only the rear half of a full fender that guards against moisture and dirt. With this in mind, the Win Wing is intended to be mounted very close to the tire and angled up (there are three center holes on each blade to aid in achieving this angle). The Wishbone mount comes in two sizes, a Gravel size and a Road size, with each model corresponding to category Blade widths.
If you've got a bike that just won't take mudguards, or you want a guard that you can pop on your best bike for the occasional damp solo ride, the Win Wing is for you. Verdict Ass Savers offers two versions of the Win Wing: one for road bikes with tires up to 38mm and one for larger dirt and gravel tires up to 60mm (2.35″). The one that’s tested here is the gravel version for larger tires. I tried it on two bikes, my Tumbleweed Stargazer with 29 x 2.35” tires and another test bike with 2.4s—the gray one shown in many of these photos. Neil also tested his with 27.5 x 2.6″ tires, as you’ll learn in the video at the bottom of the post. The distance between the wishbone and the tire should be between 5-10 mm. These three holes allow you to change the angle of your mudguard. First test of the Ass Savers Win Wing 2 He was heavily involved in the mountain bike boom of the late 1980s as a racer, team manager and race promoter, and that led to writing for Mountain Biking UK magazine shortly after its inception. He got the gig by phoning up the editor and telling him the magazine was rubbish and he could do better. Rather than telling him to get lost, MBUK editor Tym Manley called John’s bluff and the rest is history. It was a big leap from the original Ass-Savers that simply clipped onto your saddle. But oh, how much more effective these new fenders are! So, what’s actually new?
FOLD. The biggest mistake I see people make when installing an Ass Saver is not folder the creases enough before install. You must fold hard on the fender’s creases to meet its designed rigidity, as not doing so will result in a floppy and underperforming mudguard. As unlikely as it looks with its partial tyre coverage, this mudguard really does keep you clean from the knees up.
The simple attachment system also means that it’s super easy to swap between bikes and it is also compatible with a wide range of tyres. This has been a godsend as I have accumulated more and more test bikes to ride and fitting anything more complicated (or permanent) on each would be too much of an effort. The Win Wing takes about half a minute to take off from one bike and attach to another - and while swapping it around I’ve noticed it’s also not scratched my seat stays (I would still recommend attaching a piece of frame protection tape as a precaution). And if you’re worried about theft, Ass Savers has designed it with a little zip-tie hole so you can zip-tie it to your seat stays semi-permanently.
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