The fender offers zero spray protection for anything below the top of your seattube. If you have it on a full-suspension bike (like this Canyon Lux Trail), the pivots are still exposed to spray and the swingarm will still fill up with mud… or in my case pine needles. There are other clip-on rear mudguards on the market, but the Win Wing has taken a fresh approach to the problem. Made up of only four components, which are easy to assemble, the Win Wing attaches in seconds and can be swapped between bikes with ease. At the heart of the design is the wishbone holder made from glass fiber reinforced PA (polyamide), that attaches to the seat stays with two neatly fitting rubber straps. The rubber straps have been cleverly designed to sit between the wishbone and seat stays to offer your paint some protection. Ass Savers recommends fitting the wishbone close enough to the tire to achieve between 5-10mm clearance to the blade once fitted. The polypropylene blade easily snaps into position onto the studs molded into the wishbone and there are three positions available to allow for varying seat stay angles. A horizontal, or slightly upward tilting blade is optimum. There’s a helpful guide printed onto the underside of the blade to help achieve the best setup.

Compare those as 3x as heavy as the two sizes of regular Ass Savers 19/26g, which offer less protection.

Installation

Material: Blade - 0.9 mm PP (Polypropylene),Wishbone holder - glassfiber reinforced PA (Polyamid or Nylon) and Strap - TPU (thermoplastic polyurethane). 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. 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. 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 The straps are made from ultra-tough TPU and should be pulled as tight as you can comfortably do by hand. If you experience that the mudguard is not stable, try to use the next hole in the strap.

I’m not really a mudguard kind of a guy, honestly. I haven’t installed or used fenders in around 10 years and typically just opt to get dirty, even though we live in a very wet and muddy part of the world. However, when the Swedish brand Ass Savers got in touch and asked if we were interested in collaborating on the launch of the new Win Wing, I tossed preconceptions and vanity to the wind. In person, the Win Wing’s patent-pending Wishbone is quite impressive. It’s very well-engineered and seems equally well-made. It consists of three pieces: a fiberglass-reinforced polyamid Nylon arch and two TPU (thermoplastic polyurethane) straps. The straps each have a T-shaped base that fits within the molded foot part of the Wishbone. These provide a nice grippy and non-abrasive connection to the seat stays. The straps wrap around the seat stays, thread through a slot at the inside of each wishbone leg, and then connect to a molded tooth on the outside. There’s also an additional slot on the drive-side leg for an “anti-theft” zip tie. Boulder, and Colorado more broadly, is heralded as getting 300 days of sunshine a year (there’s a reason I have chosen to live here) and, even in the summer “monsoon” season, the routine afternoon showers are short-lived, and (of late) less substantial all around. As such, I’ve never felt the need to outfit any of my bikes with permanent fenders, though they do lend a certain utilitarian panache to a classic skinny-tubed steel steed, imo. Sure, it would be nice to have on my commuter but in my current location it’s far from necessary and I recognize that half of that desire would be motivated purely by the aesthetic glint of hammered alloy. Remember, just because Ass Savers calls it a wishbone, you shouldn’t pull both ends apart and make a wish. Unless your wish is to break a perfectly functional fender. It is tough, but not indestructible. (Photo/Ass Savers)Some of the water, mud, and general road spray off the tire will of course still stay attached and make its way onto your bike and legs… but all of the tangential lines connecting from your wet rear tire to your butt get stopped by the Win Wing. Recognizing that their ideal product should excel at its purpose then go hide out in your garage as soon as the weather shifts is fundamental in the Win Wing design: it’s remarkably stable while riding, very light, protects riders from the embarrassing spray streak, and is a cinch to take on and off the bike. Have a look at this BMC URS gravel bike and you can see the seatpost stayed totally clean (or at least as clean as it was before I mounted the fender). But everything below that still gets wet & muddy. As described in our original Win Wing review, there are a few key steps that must be taken to ensure optimal performance when installing the Ass Savers Win Wing 2. 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."