Cycling Gear
ASS Savers Win Wing MTB Review: Lightweight Rear Mudguard
ASS Savers Win Wing MTB Review – Minimalistic, Light, Effective
What the Win Wing MTB Is (and Isn’t)
The Win Wing MTB is a rear tire-mounted splash guard that straps to your seatstays using two chunky rubber bands. The “wing” itself sits close to the top of the rear wheel, angled to intercept spray as it leaves the tread. The goal: keep your back, shorts, and pack noticeably cleaner on wet trails and puddle-strewn commutes.
What it isn’t is a full-coverage system for axle-deep mud, bike-park roost, or days when the trail behaves like peanut butter. And that’s fine—provided you buy it for the right job.
Design Philosophy: Intercept the Spray, Don’t Fight Physics
The smartest detail here is positioning. Full-length mudguards work by blocking spray across a large arc. Minimal guards work by interrupting the most direct stream. The Win Wing MTB sits where the tire is flinging water upward with maximum velocity. Slice that plume early and you reduce the amount of muck that reaches your torso.
In practice, the Win Wing MTB behaves like a “cut-off valve” for puddle blasts. Hit standing water at speed and you’ll still get some side spray and mist, but that classic stripe up the spine? Dramatically reduced.
- 【Frame】: Durable steel dual suspension Mountain Bike frame. Featured with Front suspension fork and rear coil shock to smooth out the bumps along the way.
- 【Speeds】: Effortless gear change with 18-speed twist shifters and front and rear derailleurs.Help you find the perfect cadence to navigate your path ahead.
- 【Control】: Front and rear linear pull brakes provide control and strong stopping power.
- 【Tires】: The 26-inch all-terrain bike tires are great for various terrains, while fit to riders 5'2'' to 6'2'' inches tall.
- 【Ideal Rider】: The ideal rider for this bike is a men/woman aged 13 and up.
- 【Frame】: Durable steel dual suspension Mountain Bike frame. Featured with Front suspension fork and rear coil shock to smooth out the bumps along the way.
- 【Speeds】: Effortless gear change with 18-speed twist shifters and front and rear derailleurs.Help you find the perfect cadence to navigate your path ahead.
- 【Control】: Front and rear linear pull brakes provide control and strong stopping power.
- 【Tires】: The 26-inch all-terrain bike tires are great for various terrains, while fit to riders 5'2'' to 6'2'' inches tall.
- 【Ideal Rider】: The ideal rider for this bike is a men/woman aged 13 and up.
- SMOOTH DUAL SUSPENSION FOR COMFORT: Front suspension fork and rear spring shock absorb bumps, providing a controlled, comfortable ride on trails, gravel paths, and uneven roads.
- DURABLE STEEL FRAME WITH STYLISH DESIGN: The strong steel frame features a sleek gray gloss finish with bold red accents for durability, a modern look, and long-lasting performance.
- 21-SPEED SHIMANO GEAR SYSTEM: Conquer any terrain with the 21-speed drivetrain, Shimano rear derailleur, and twist shifters for smooth, precise gear changes, even on steep hills.
- KNOBBY ALL-TERRAIN TIRES FOR GREAT TRACTION: 26-inch tires deliver excellent grip and stability on dirt, gravel, or pavement, ensuring confidence and control in any conditions.
- BUILT FOR RIDERS 5'0" OR TALLER: Perfect for trail rides, commutes, or recreational cycling, this bike offers a comfortable fit and all the features you need for exciting outdoor adventures.
Materials and Durability: Flex Beats Fragile
The blade is made from a flexible plastic that’s more “bend-and-survive” than “snap-and-replace.” If you crash, snag it on brush, or stuff the bike into a packed car trunk, it’s more likely to shrug it off than shatter. The rubber straps are impressively elastic—tight enough to hold tension, forgiving enough to install quickly, and tough enough that you don’t feel like you’re one tug away from tearing them.
For riders who like to keep their setups quiet, there’s a major perk: when installed correctly, the Win Wing doesn’t touch the tire. That means no buzzing soundtrack, no sanding your side knobs, and no mystery scuffs on your frame.
Installation and Compatibility: Brilliantly Simple—Until It Isn’t
Tool-free mounting is the headline. Loop the straps around the seatstays, tension it down, and dial the wing’s position. On many modern trail and eMTB frames, the install is genuinely a sub-one-minute job.
The caveat is seatstay bulk. Some bikes have stout, wide stays or complex shaping that makes any strap-based guard a tight squeeze. When the fit is marginal, you’ll spend more time wrestling the straps than riding—especially with cold fingers on a wet day. If your bike’s rear triangle is chunky, measure twice and temper expectations.
My advice: if you’re on an eMTB with wide tires and a high-torque motor, pay extra attention to alignment. The increased spray volume and speed makes positioning more critical; small angle changes can make a big difference in where the water ends up.
On-Trail Performance: The Puddle Specialist
On flow trails in wet conditions, the Win Wing MTB does exactly what it promises. It cuts the main rooster tail so your back stays significantly cleaner. If you wear a pack, you’ll still see some grime around the edges, but it’s the difference between “I can walk into a café” and “I need a hose.”
On rougher trails, the guard surprised me with how stable it feels—again, assuming you’ve tensioned everything properly. No persistent rattling. No tire contact in normal riding. In a few cases, harsh compressions or misalignment can cause light rubbing, but it’s typically brief and not destructive.
Where it reaches its limit is obvious: thick, sticky mud that clings to the tire and launches in every direction, plus aggressive riding where debris is constantly hitting the wing. In those conditions, a full-size rear mudguard remains the right tool. The Win Wing MTB is a minimalist solution, not a miracle.
Weight, Packability, and “Why You’ll Actually Use It”
At 114 g, the Win Wing MTB is the kind of accessory you don’t talk yourself out of. It’s light enough to leave on all season, and flat enough to stash in a pack if the forecast is uncertain. That matters because the best mudguard is the one that’s on the bike when the skies open.
Buying Notes and Useful Alternatives
If you’re building a wet-weather kit, the Win Wing MTB pairs well with a front fender to protect your face and fork seals. For riders who want more coverage, there are heavier, more comprehensive rear solutions—but they come with more hardware and more visual footprint.
- WIN WING 2 with MAXIMUM PROTECTION AT MINIMUM WEIGHT: Win Wing 2 (with black wishbone) is the stronger, gentler, and darker version, designed optimally to shield only the upper rear quarter of the wheel, preventing sprays from reaching the critical areas of the rider. This design minimizes the amount of material used for construction, and thereby keeping the weight minimal. The mudguard has to be installed quite close to the wheel, with a target of 5-10 mm tire clearance for maximum coverage.
- SECURE MOUNTING: Win Wing 2 Gravel is suitable for all gravel bikes with tire widths up to 60 mm. Choose from one of the three possible settings to match with the angle of your seat stays, and the one that will allow a horizontal or a tail-up position. Avoid a tail-down angle as this will reduce the efficiency of the fender. The straps are made from ultra-tough TPU and should be pulled as tight as you can comfortably do by hand. Review videos and instructions for best performance.
- ANTI JAM, ANTI THEFT DESIGN: As sturdy as it is, the design of the Win-wing allows it to flex in case of an accident and it's constructed to not jam in case of large chunks of nature get stuck to your wheel. If you like to keep it attached to your bike permanently, the Win-Wing can be secured to your bike with a standard zip tie, through a designated slot, making it easier to resist for people with sticky fingers. If you experience that the mudguard is not stable, try to use the next hole.
- DURABILITY: Win Wing has been designed with emphasis on sophisticated simplicity and careful choice of materials, making it 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. Well engineered design helps with transformation from the flat form to a functional mudguard using a pre-folding process.
- SUSTAINABLE: The black blade is made from 80% recycled PP and the Win Wing has been designed for efficient shipping and easy recycling. Each component can be purchased separately, making repairing and upgrading convenient. The Win-Wing is 100% Made in Sweden in ISO 14001 certified factories.
- It is fitted as close as possible to the knobbly bits for optimum 'muck' catching
- It can be used on all wheel sizes
- It protects your fork stanchions and bridge from getting caked, reducing the need for cleaning and servicing
- It's small but effective; Don't just take our word for it; There's loads of positive chit chat on the forums and in the online mags
- It's compatible with all forward and double bridge fork designs
- Fender profile will work with tires up to 25mm wide
- Compatible with 700c (28") wheel sizes
- Includes all mounting hardware
- Front Fender Length: 678mm
- Rear Fender Length: 958mm
- Quick Release Attachment System: Fenders attach with SKS Omni Straps that provide a strong, slip resistant hold on your frame and fork while protecting your paint finish
- Secure Four-Point Mounting: Four attachment points on the Mudrocker rear fender ensure that the fender stays securely in place during rides
- Adjustable Frame Adapter Pads: Reversible frame adapter pads for the rear fender allow the rider to adjust the pitch of the fender based on wheel size for optimal coverage
- Versatile Front Mounting Options: Mudrocker Front comes with a bolt-on option for a more permanent mounting solution with an adapter that allows fitment for most Fox, Ohlins, and Rockshox forks
- Wide Tire Compatibility: Both the front and rear fenders are suitable for mountain bike tires up to 3.0 inches wide, accommodating 27.5, 650b, and 29er wheels
- Includes 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, and 6mm hex wrenches
- Wrenches made from industrial tool steel, through hardened and tempered for long life
- Chamfered tips for a perfect fit
- NANO TECHNOLOGY: State-of-the-art Nano Tech formula breaks down dirt and grime on a molecular level for the ultimate clean.
- BIODEGRADABLE: Fully biodegradable, alkaline-based formula that is free from acids, solvents and CFCs so that you can clean guilt-free.
- SAFE ON COMPONENTS: Safe on all surfaces, including carbon fibre, this infamous pink cleaner won’t damage any parts – it’s even disc brake friendly!
- VARIETY OF SIZES: Available in a 1 Litre spray, 5 Litre bottle and 25 Litre drum – avid riders can amp up the value and do their bit for the planet with our gnarly bigger sizes.
- SUITABLE FOR ALL BIKES: Whether you prefer to hit the road or shred the trails on your MTB, Nano Tech Bike Cleaner is the ultimate post-ride bike wash.
- Premium Wet-Style Lubricant: Formulated to provide maximum performance in rain, mud, and extreme riding conditions
- Long-Lasting Protection: Delivers lasting lubrication for maximum mileage and drivetrain protection.
- Friction Reducing Formula: Keeps pedaling smooth and efficient on road, mountain, gravel, or cyclocross bikes
- Repels Water and Contaminants: Creates a durable barrier that resists water, grit, and grime for reliable performance
- Versatile Use: Trusted by riders for commuting, long-distance touring, training, and high-torque riding situations
Who It’s For
Get the Win Wing MTB if: you ride mixed conditions, want meaningful spray reduction, hate noisy accessories, and value quick installation. It’s especially appealing for commuters, tour riders, and trail riders who don’t want a big plastic tail hanging off the bike all year.
Skip it if: you regularly ride in deep clay-like mud, spend lots of time in bike parks, or have a frame with very wide seatstays that make strap fit finicky. In those cases, more coverage and a more robust mounting system will save you frustration.
Editorial Verdict
The ASS Savers Win Wing MTB is one of those products that wins you over by staying out of your way. It’s quiet, light, and genuinely effective at reducing the worst of rear spray—particularly the puddle blast that turns a fun ride into a laundry problem. The biggest limiting factor is compatibility: if the straps can’t comfortably wrap your seatstays, the whole minimalist concept collapses.
For the right bike and the right expectations, it’s a smart, elegant upgrade—minimalistic, light, and effective.
FAQ
- Will the Win Wing MTB keep me completely dry?
- No. It primarily reduces the central rooster tail hitting your back. Side spray and mist still happen, especially in heavy rain or sloppy mud.
- Does it rattle on rough trails?
- When installed tightly and positioned correctly, it’s impressively quiet because it doesn’t contact the tire. Loose straps or poor alignment can introduce noise or occasional rub.
- Is it safe for carbon frames?
- Generally yes, but keep the contact points clean and ensure straps aren’t trapping grit against the frame. If you’re cautious, apply protective tape where the straps sit.
- Will it fit eMTBs?
- Often, yes. But some eMTBs have wider seatstays, and strap length can become the limiting factor. Check clearance and strap reach before committing.
- How should I position it for best protection?
- Angle it so the wing sits close to the top of the tire and intercepts the upward spray line. Small adjustments make a big difference—test after the first wet ride and tweak.
- Is it worth pairing with a front fender?
- Absolutely. A rear mini-guard protects your back; a front fender protects your face, fork seals, and headset area. Together, they make wet riding far more pleasant.
Kristina — Lead Editor, CyclingTrend.com
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